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Condliffe R, Durrington C, Hameed A, Lewis RA, Venkateswaran R, Gopalan D, Dorfmüller P. Clinical-radiological-pathological correlation in pulmonary arterial hypertension. Eur Respir Rev 2023; 32:230138. [PMID: 38123231 PMCID: PMC10731450 DOI: 10.1183/16000617.0138-2023] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2023] [Accepted: 08/21/2023] [Indexed: 12/23/2023] Open
Abstract
Pulmonary hypertension (PH) is defined by the presence of a mean pulmonary arterial pressure >20 mmHg. Current guidelines describe five groups of PH with shared pathophysiological and clinical features. In this paper, the first of a series covering all five PH classification groups, the clinical, radiological and pathological features of pulmonary arterial hypertension (PAH) will be reviewed. PAH may develop in the presence of associated medical conditions or a family history, following exposure to certain medications or drugs, or may be idiopathic in nature. Although all forms of PAH share common histopathological features, the presence of certain pulmonary arterial abnormalities, such as plexiform lesions, and extent of co-existing pulmonary venous involvement differs between the different subgroups. Radiological investigations are key to diagnosing the correct form of PH and a systematic approach to interpretation, especially of computed tomography, is essential.
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Affiliation(s)
- Robin Condliffe
- Sheffield Pulmonary Vascular Disease Unit, Royal Hallamshire Hospital, Sheffield Teaching Hospitals NHS Foundation Trust, Sheffield, UK
- Department of Infection, Immunity and Cardiovascular Disease, Medical School, University of Sheffield, Sheffield, UK
- National Institute for Health and Care Research Sheffield Biomedical Research Centre, Sheffield, UK
- These authors contributed equally to this work
| | - Charlotte Durrington
- Sheffield Pulmonary Vascular Disease Unit, Royal Hallamshire Hospital, Sheffield Teaching Hospitals NHS Foundation Trust, Sheffield, UK
- Department of Infection, Immunity and Cardiovascular Disease, Medical School, University of Sheffield, Sheffield, UK
| | - Abdul Hameed
- Sheffield Pulmonary Vascular Disease Unit, Royal Hallamshire Hospital, Sheffield Teaching Hospitals NHS Foundation Trust, Sheffield, UK
- Department of Infection, Immunity and Cardiovascular Disease, Medical School, University of Sheffield, Sheffield, UK
| | - Robert A Lewis
- Department of Respiratory Medicine, Middlemore Hospital, Auckland, New Zealand
| | - Rajamiyer Venkateswaran
- Department of Heart and Lung Transplantation, Manchester University NHS Foundation Trust, Manchester, UK
| | - Deepa Gopalan
- Department of Radiology, Imperial College Healthcare NHS Trust, London, UK
- These authors contributed equally to this work
| | - Peter Dorfmüller
- Department of Pathology, University Hospital of Giessen and Marburg, Giessen, Germany
- Institute for Lung Health, Giessen, Germany
- These authors contributed equally to this work
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Sanders TJ, Allen JL, Horvat J, Lewis RA. Theoretical modeling of the terahertz spectrum of l-tyrosine leads to experimental verification of previously unobserved vibrational mode. J Chem Phys 2023; 159:105103. [PMID: 37702359 DOI: 10.1063/5.0165307] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2023] [Accepted: 08/24/2023] [Indexed: 09/14/2023] Open
Abstract
We have calculated the theoretical terahertz spectrum of the amino acid l-tyrosine using density functional theory (DFT). We tried two electron density functionals, Perdew-Burke-Ernzerhof (PBE) and PBE-d3. PBE-d3 includes dispersion corrections to build in van der Waals interactions, which play a role in intermolecular bonding. Both DFT models predicted a low-frequency mode that has not been previously reported. We designed an experiment to search for this mode. Using a deliberately thick sample, intense synchrotron radiation, low temperatures, and temperature variation has enabled us to observe a new resonance at 1.79 ±0.01 THz. While the PBE and PBE-d3 spectra are similar and both match the low-energy experimental data, overall the PBE-d3 appears to be slightly superior. Further refinement still of the functional may lead to even better agreement with experiment above 2.4 THz.
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Affiliation(s)
- T J Sanders
- Institute for Superconducting and Electronic Materials and School of Physics, University of Wollongong, Wollongong NSW 2522, Australia
- Australian Synchrotron, Australian Nuclear Science and Technology Organisation, 800 Blackburn Rd., Clayton, VIC 3168, Australia
| | - J L Allen
- Institute for Superconducting and Electronic Materials and School of Physics, University of Wollongong, Wollongong NSW 2522, Australia
| | - J Horvat
- Institute for Superconducting and Electronic Materials and School of Physics, University of Wollongong, Wollongong NSW 2522, Australia
| | - R A Lewis
- Institute for Superconducting and Electronic Materials and School of Physics, University of Wollongong, Wollongong NSW 2522, Australia
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Lewis RA, Kashongwe OB, Bebe BO. Quantifying production losses associated with foot and mouth disease outbreaks on large-scale dairy farms in Rift valley, Kenya. Trop Anim Health Prod 2023; 55:293. [PMID: 37608201 DOI: 10.1007/s11250-023-03707-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2022] [Accepted: 07/28/2023] [Indexed: 08/24/2023]
Abstract
Foot and Mouth Disease (FMD) is a contagious viral disease to which dairy cattle are highly susceptible. An outbreak of FMD in a dairy herds can cause a drop in milk yield, increase mastitis infections, and force culling. These production losses can be substantial, but farmers undervalue the magnitude of the loss that they incur. The study quantified the association of FMD outbreaks with milk yield, mastitis incidences, and culling rates. The data was from three large-scale dairy farms with a recent history (2008 to 2018) of FMD outbreaks in a region endemic for the prevalence of serotype C of the FMD virus since the mid-1980s in the Rift valley of Kenya. A total of 507 cows were monitored for three consecutive periods of six weeks before, during, and after FMD outbreaks. Relative to the period before and after the disease outbreak, production losses were marked during the outbreak. A disease outbreak was associated with up to 4.7% of the cows drying off (n = 24) and milk production dropped by 16.1%. The incidence of mastitis increased from 5.4% to 21.5% (OR = 3.31, CI = 2.27, 4.83) and culling rates increased from 0.59% to 3.8% (OR = 6.71, CI = 1.99, 22.58).
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Affiliation(s)
- R A Lewis
- Department of Animal Sciences, Faculty of Agriculture, University of Egerton, Njoro, Kenya.
- Department of Animal Production, Faculty of Natural Resources and Environmental Studies, University of Juba, Juba, South Sudan.
| | - O B Kashongwe
- Department of Animal Sciences, Faculty of Agriculture, University of Egerton, Njoro, Kenya
| | - B O Bebe
- Department of Animal Sciences, Faculty of Agriculture, University of Egerton, Njoro, Kenya
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Allen JL, Sanders TJ, Horvat J, Lewis RA, Rule KC. Determination of Vibrational Modes of l-Alanine Single Crystals by a Combination of Terahertz Spectroscopy Measurements and Density Functional Calculations. Phys Rev Lett 2023; 130:226901. [PMID: 37327443 DOI: 10.1103/physrevlett.130.226901] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/03/2022] [Accepted: 03/17/2023] [Indexed: 06/18/2023]
Abstract
Density-functional theory may be used to predict both the frequency and the dipole moment of the fundamental oscillations of molecular crystals. Suitably polarized photons at those frequencies excite such oscillations. Thus, in principle, terahertz spectroscopy may confirm the calculated fundamental modes of amino acids. However, reports to date have multiple shortcomings: (a) material of uncertain purity and morphology and diluted in a binder material is employed; (b) consequently, vibrations along all crystal axes are excited simultaneously; (c) data are restricted to room temperature, where resonances are broad and the background dominant; and (d) comparison with theory has been unsatisfactory (in part because the theory assumes zero temperature). Here, we overcome all four obstacles, in reporting detailed low-temperature polarized THz spectra of single-crystal l-alanine, assigning vibrational modes using density-functional theory, and comparing the calculated dipole moment vector direction to the electric field polarization of the measured spectra. Our direct and detailed comparison of theory with experiment corrects previous mode assignments for l-alanine, and reveals unreported modes, previously obscured by closely spaced spectral absorptions. The fundamental modes are thereby determined.
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Affiliation(s)
- J L Allen
- Institute for Superconducting and Electronic Materials and School of Physics, University of Wollongong, Wollongong, New South Wales 2522, Australia
| | - T J Sanders
- Institute for Superconducting and Electronic Materials and School of Physics, University of Wollongong, Wollongong, New South Wales 2522, Australia
| | - J Horvat
- Institute for Superconducting and Electronic Materials and School of Physics, University of Wollongong, Wollongong, New South Wales 2522, Australia
| | - R A Lewis
- Institute for Superconducting and Electronic Materials and School of Physics, University of Wollongong, Wollongong, New South Wales 2522, Australia
| | - K C Rule
- Australian Centre for Neutron Scattering, Australian Nuclear Science and Technology Organisation, Lucas Heights, New South Wales 2234, Australia
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Sanders TJ, Allen JL, Plathe R, Appadoo D, Horvat J, Lewis RA. Terahertz tyrosine modes. Spectrochim Acta A Mol Biomol Spectrosc 2023; 286:121970. [PMID: 36302282 DOI: 10.1016/j.saa.2022.121970] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/08/2022] [Revised: 10/06/2022] [Accepted: 10/07/2022] [Indexed: 06/16/2023]
Abstract
We have measured the terahertz spectrum of pure l-tyrosine at nineteen temperatures in the range 6K to 300K using a synchrotron as the source of radiation. By fitting the temperature dependence of the observed modes with a Bose-Einstein model, we determine unequivocal low-frequency modes of l-tyrosine at absolute zero temperature occur at 1.02 ± 0.01, 1.61 ± 0.01, 1.97 ± 0.01, and 2.19 ± 0.01THz. This determination is consistent with the more reliable of the earlier measurements. We conclude that many of the recently reported features in the terahertz spectrum of l-tyrosine are experimental artefacts.
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Affiliation(s)
- T J Sanders
- Institute for Superconducting and Electronic Materials and School of Physics, University of Wollongong, NSW 2522, Australia.
| | - J L Allen
- Institute for Superconducting and Electronic Materials and School of Physics, University of Wollongong, NSW 2522, Australia
| | - R Plathe
- Australian Synchrotron, Australian Nuclear Science and Technology Organisation, 800 Blackburn Rd Clayton, VIC 3168, Australia
| | - D Appadoo
- Australian Synchrotron, Australian Nuclear Science and Technology Organisation, 800 Blackburn Rd Clayton, VIC 3168, Australia
| | - J Horvat
- Institute for Superconducting and Electronic Materials and School of Physics, University of Wollongong, NSW 2522, Australia
| | - R A Lewis
- Institute for Superconducting and Electronic Materials and School of Physics, University of Wollongong, NSW 2522, Australia
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Hoeper MM, Dwivedi K, Pausch C, Lewis RA, Olsson KM, Huscher D, Pittrow D, Grünig E, Staehler G, Vizza CD, Gall H, Distler O, Opitz C, Gibbs JSR, Delcroix M, Park DH, Ghofrani HA, Ewert R, Kaemmerer H, Kabitz HJ, Skowasch D, Behr J, Milger K, Lange TJ, Wilkens H, Seyfarth HJ, Held M, Dumitrescu D, Tsangaris I, Vonk-Noordegraaf A, Ulrich S, Klose H, Claussen M, Eisenmann S, Schmidt KH, Swift AJ, Thompson AAR, Elliot CA, Rosenkranz S, Condliffe R, Kiely DG, Halank M. Phenotyping of idiopathic pulmonary arterial hypertension: a registry analysis. Lancet Respir Med 2022; 10:937-948. [PMID: 35777416 PMCID: PMC9514996 DOI: 10.1016/s2213-2600(22)00097-2] [Citation(s) in RCA: 45] [Impact Index Per Article: 22.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/21/2021] [Revised: 03/02/2022] [Accepted: 03/08/2022] [Indexed: 11/29/2022]
Abstract
BACKGROUND Among patients meeting diagnostic criteria for idiopathic pulmonary arterial hypertension (IPAH), there is an emerging lung phenotype characterised by a low diffusion capacity for carbon monoxide (DLCO) and a smoking history. The present study aimed at a detailed characterisation of these patients. METHODS We analysed data from two European pulmonary hypertension registries, COMPERA (launched in 2007) and ASPIRE (from 2001 onwards), to identify patients diagnosed with IPAH and a lung phenotype defined by a DLCO of less than 45% predicted and a smoking history. We compared patient characteristics, response to therapy, and survival of these patients to patients with classical IPAH (defined by the absence of cardiopulmonary comorbidities and a DLCO of 45% or more predicted) and patients with pulmonary hypertension due to lung disease (group 3 pulmonary hypertension). FINDINGS The analysis included 128 (COMPERA) and 185 (ASPIRE) patients with classical IPAH, 268 (COMPERA) and 139 (ASPIRE) patients with IPAH and a lung phenotype, and 910 (COMPERA) and 375 (ASPIRE) patients with pulmonary hypertension due to lung disease. Most patients with IPAH and a lung phenotype had normal or near normal spirometry, a severe reduction in DLCO, with the majority having no or a mild degree of parenchymal lung involvement on chest computed tomography. Patients with IPAH and a lung phenotype (median age, 72 years [IQR 65-78] in COMPERA and 71 years [65-76] in ASPIRE) and patients with group 3 pulmonary hypertension (median age 71 years [65-77] in COMPERA and 69 years [63-74] in ASPIRE) were older than those with classical IPAH (median age, 45 years [32-60] in COMPERA and 52 years [38-64] in ASPIRE; p<0·0001 for IPAH with a lung phenotype vs classical IPAH in both registries). While 99 (77%) patients in COMPERA and 133 (72%) patients in ASPIRE with classical IPAH were female, there was a lower proportion of female patients in the IPAH and a lung phenotype cohort (95 [35%] COMPERA; 75 [54%] ASPIRE), which was similar to group 3 pulmonary hypertension (336 [37%] COMPERA; 148 [39%] ASPIRE]). Response to pulmonary arterial hypertension therapies at first follow-up was available from COMPERA. Improvements in WHO functional class were observed in 54% of patients with classical IPAH, 26% of patients with IPAH with a lung phenotype, and 22% of patients with group 3 pulmonary hypertension (p<0·0001 for classical IPAH vs IPAH and a lung phenotype, and p=0·194 for IPAH and a lung phenotype vs group 3 pulmonary hypertension); median improvements in 6 min walking distance were 63 m, 25 m, and 23 m for these cohorts respectively (p=0·0015 for classical IPAH vs IPAH and a lung phenotype, and p=0·64 for IPAH and a lung phenotype vs group 3 pulmonary hypertension), and median reductions in N-terminal-pro-brain-natriuretic-peptide were 58%, 27%, and 16% respectively (p=0·0043 for classical IPAH vs IPAH and a lung phenotype, and p=0·14 for IPAH and a lung phenotype vs group 3 pulmonary hypertension). In both registries, survival of patients with IPAH and a lung phenotype (1 year, 89% in COMPERA and 79% in ASPIRE; 5 years, 31% in COMPERA and 21% in ASPIRE) and group 3 pulmonary hypertension (1 year, 78% in COMPERA and 64% in ASPIRE; 5 years, 26% in COMPERA and 18% in ASPIRE) was worse than survival of patients with classical IPAH (1 year, 95% in COMPERA and 98% in ASPIRE; 5 years, 84% in COMPERA and 80% in ASPIRE; p<0·0001 for IPAH with a lung phenotype vs classical IPAH in both registries). INTERPRETATION A cohort of patients meeting diagnostic criteria for IPAH with a distinct, presumably smoking-related form of pulmonary hypertension accompanied by a low DLCO, resemble patients with pulmonary hypertension due to lung disease rather than classical IPAH. These observations have pathogenetic, diagnostic, and therapeutic implications, which require further exploration. FUNDING COMPERA is funded by unrestricted grants from Acceleron, Bayer, GlaxoSmithKline, Janssen, and OMT. The ASPIRE Registry is supported by Sheffield Teaching Hospitals NHS Foundation Trust, Sheffield, UK.
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Affiliation(s)
- Marius M Hoeper
- Clinic of Respiratory Medicine, Hannover Medical School, member of the German Center of Lung Research (DZL), Germany.
| | - Krit Dwivedi
- Sheffield Pulmonary Vascular Disease Unit, Royal Hallamshire Hospital and Department of Infection, Immunity and Cardiovascular Disease, University of Sheffield, Sheffield, UK
| | - Christine Pausch
- GWT-TUD, Epidemiological Centre, Technical University Dresden, Dresden, Germany
| | - Robert A Lewis
- Sheffield Pulmonary Vascular Disease Unit, Royal Hallamshire Hospital and Department of Infection, Immunity and Cardiovascular Disease, University of Sheffield, Sheffield, UK
| | - Karen M Olsson
- Clinic of Respiratory Medicine, Hannover Medical School, member of the German Center of Lung Research (DZL), Germany
| | - Doerte Huscher
- Institute of Biometry and Clinical Epidemiology, and Berlin Insitute of Health, Charité-Universitätsmedizin, Berlin, Germany
| | - David Pittrow
- GWT-TUD, Epidemiological Centre, Technical University Dresden, Dresden, Germany; Institute for Clinical Pharmacology, Medical Faculty, Technical University Dresden, Dresden, Germany
| | - Ekkehard Grünig
- Center for Pulmonary Hypertension, Thoraxklinik at Heidelberg University Hospital, Translational Lung Research Center Heidelberg, member of the German Center for Lung Research (DZL), Germany
| | | | - Carmine Dario Vizza
- Dipartimento di Scienze Cliniche Internistiche, Anestiologiche e Cardiolohiche, Sapienza, University of Rome, Rome, Italy
| | - Henning Gall
- Department of Internal Medicine, Justus-Liebig-University Giessen, Universities of Giessen and Marburg Lung Center, Giessen, Germany
| | - Oliver Distler
- Department of Rheumatology, University Hospital Zurich, University of Zurich, Zurich, Switzerland
| | - Christian Opitz
- Department of Cardiology, DRK Kliniken Berlin Westend, Berlin, Germany
| | - John Simon R Gibbs
- Department of Cardiology, National Heart & Lung Institute, Imperial College London, London, UK
| | - Marion Delcroix
- Clinical Department of Respiratory Diseases, University Hospitals of Leuven and Laboratory of Respiratory Diseases and Thoracic Surgery, Department of Chronic Diseases and Metabolism, Katholieke Universiteit Leuven University of Leuven, Leuven, Belgium
| | - Da-Hee Park
- Clinic of Respiratory Medicine, Hannover Medical School, member of the German Center of Lung Research (DZL), Germany
| | - Hossein Ardeschir Ghofrani
- Department of Internal Medicine, Justus-Liebig-University Giessen, Universities of Giessen and Marburg Lung Center, Giessen, Germany; Department of Medicine, Imperial College London, London, UK
| | - Ralf Ewert
- Clinic of Internal Medicine, Department of Respiratory Medicine, Universitätsmedizin Greifswald, Greifswald, Germany
| | - Harald Kaemmerer
- Deutsches Herzzentrum München, Klinik für angeborene Herzfehler und Kinderkardiologie; TU München, Munich, Germany
| | - Hans-Joachim Kabitz
- Gemeinnützige Krankenhausbetriebsgesellschaft Konstanz, Medizinische Klinik II, Konstanz, Germany
| | - Dirk Skowasch
- Universitätsklinikum Bonn, Medizinische Klinik und Poliklinik II, Innere Medizin - Kardiologie/Pneumologie, Bonn, Germany
| | - Juergen Behr
- Department of Medicine V, University Hospital, LMU Munich, Comprehensive Pneumology Center Munich, member of the German Center for Lung Research (DZL), Germany
| | - Katrin Milger
- Department of Medicine V, University Hospital, LMU Munich, Comprehensive Pneumology Center Munich, member of the German Center for Lung Research (DZL), Germany
| | - Tobias J Lange
- University Medical Center Regensburg, Department of Internal Medicine II, Regensburg, Germany
| | - Heinrike Wilkens
- Klinik für Innere Medizin V, Pneumologie, Universitätsklinikum des Saarlandes, Homburg, Germany
| | - Hans-Jürgen Seyfarth
- Universitätsklinikum Leipzig, Medizinische Klinik und Poliklinik II, Abteilung für Pneumologie, Leipzig, Germany
| | - Matthias Held
- Department of Internal Medicine, Respiratory Medicine and Ventilatory Support, Medical Mission Hospital, Central Clinic Würzburg, Germany
| | - Daniel Dumitrescu
- Clinic for General and Interventional Cardiology and Angiology, Herz- und Diabeteszentrum NRW, Ruhr-Universität Bochum, Bad Oeynhausen, Germany
| | - Iraklis Tsangaris
- Attikon University Hospital, 2nd Critical Care Department, National and Kapodistrian University of Athens, Athens, Greece
| | - Anton Vonk-Noordegraaf
- Amsterdam UMC, Vrije Universiteit Amsterdam, dept of Pulmonary Medicine, Amsterdam Cardiovascular Sciences, Amsterdam, Netherlands
| | - Silvia Ulrich
- Clinic of Pulmonology, University Hospital Zurich, University of Zurich, Zurich, Switzerland
| | - Hans Klose
- Department of Respiratory Medicine, Eppendorf University Hospital, Hamburg, Germany
| | - Martin Claussen
- LungenClinic Grosshansdorf, Fachabteilung Pneumologie, Großhansdorf, Germany
| | - Stephan Eisenmann
- Universitätsklinikum Halle, Klinik für Innere Medizin I, Department of Respiratory Medicine, Halle, Germany
| | - Kai-Helge Schmidt
- Department of Cardiology and Center of Thrombosis and Hemostasis, University Medical Center Mainz, Mainz, Germany
| | - Andrew J Swift
- Sheffield Pulmonary Vascular Disease Unit, Royal Hallamshire Hospital and Department of Infection, Immunity and Cardiovascular Disease, University of Sheffield, Sheffield, UK
| | - Alfred A Roger Thompson
- Sheffield Pulmonary Vascular Disease Unit, Royal Hallamshire Hospital and Department of Infection, Immunity and Cardiovascular Disease, University of Sheffield, Sheffield, UK
| | - Charlie A Elliot
- Sheffield Pulmonary Vascular Disease Unit, Royal Hallamshire Hospital and Department of Infection, Immunity and Cardiovascular Disease, University of Sheffield, Sheffield, UK
| | - Stephan Rosenkranz
- Clinic III for Internal Medicine (Cardiology) and Center for Molecular Medicine, and the Cologne Cardiovascular Research Center, University of Cologne, Germany
| | - Robin Condliffe
- Sheffield Pulmonary Vascular Disease Unit, Royal Hallamshire Hospital and Department of Infection, Immunity and Cardiovascular Disease, University of Sheffield, Sheffield, UK
| | - David G Kiely
- Sheffield Pulmonary Vascular Disease Unit, Royal Hallamshire Hospital and Department of Infection, Immunity and Cardiovascular Disease, University of Sheffield, Sheffield, UK
| | - Michael Halank
- Universitätsklinikum Carl Gustav Carus der Technischen Universität Dresden, Medizinische Klinik und Poliklinik I, Dresden, Germany
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O'Connell DW, Morgan KS, Ruben G, Croton LCP, Pollock JA, Croughan MK, McGillick EV, Wallace MJ, Crossley KJ, Pryor EJ, Lewis RA, Hooper SB, Kitchen MJ. Accurate measures of changes in regional lung air volumes from chest x-rays of small animals. Phys Med Biol 2022; 67. [DOI: 10.1088/1361-6560/ac934d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2022] [Accepted: 09/20/2022] [Indexed: 11/11/2022]
Abstract
Abstract
Objective. To develop a robust technique for calculating regional volume changes within the lung from X-ray radiograph sequences captured during ventilation, without the use of computed tomography (CT). Approach. This technique is based on the change in transmitted X-ray intensity that occurs for each lung region as air displaces the attenuating lung tissue. Main results. Lung air volumes calculated from X-ray intensity changes showed a strong correlation (R
2=0.98) against the true volumes, measured from high-resolution CT. This correlation enables us to accurately convert projected intensity data into relative changes in lung air volume. We have applied this technique to measure changes in regional lung volumes from X-ray image sequences of mechanically ventilated, recently-deceased newborn rabbits, without the use of CT. Significance. This method is suitable for biomedical research studies and shows potential for clinical application, whilst also allowing for high temporal and regional calculation of lung air volumes.
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Goh ZM, Balasubramanian N, Alabed S, Dwivedi K, Shahin Y, Rothman AMK, Garg P, Lawrie A, Capener D, Thompson AAR, Alandejani F, Wild JM, Johns CS, Lewis RA, Gosling R, Sharkey M, Condliffe R, Kiely DG, Swift AJ. Right ventricular remodelling in pulmonary arterial hypertension predicts treatment response. Heart 2022; 108:1392-1400. [PMID: 35512982 PMCID: PMC9380507 DOI: 10.1136/heartjnl-2021-320733] [Citation(s) in RCA: 14] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/22/2021] [Accepted: 03/29/2022] [Indexed: 12/29/2022] Open
Abstract
OBJECTIVES To determine the prognostic value of patterns of right ventricular adaptation in patients with pulmonary arterial hypertension (PAH), assessed using cardiac magnetic resonance (CMR) imaging at baseline and follow-up. METHODS Patients attending the Sheffield Pulmonary Vascular Disease Unit with suspected pulmonary hypertension were recruited into the ASPIRE (Assessing the Spectrum of Pulmonary hypertension Identified at a REferral Centre) Registry. With exclusion of congenital heart disease, consecutive patients with PAH were followed up until the date of census or death. Right ventricular end-systolic volume index adjusted for age and sex and ventricular mass index were used to categorise patients into four different volume/mass groups: low-volume-low-mass, low-volume-high-mass, high-volume-low-mass and high-volume-high-mass. The prognostic value of the groups was assessed with one-way analysis of variance and Kaplan-Meier plots. Transition of the groups was studied. RESULTS A total of 505 patients with PAH were identified, 239 (47.3%) of whom have died at follow-up (median 4.85 years, IQR 4.05). The mean age of the patients was 59±16 and 161 (32.7%) were male. Low-volume-low-mass was associated with CMR and right heart catheterisation metrics predictive of improved prognosis. There were 124 patients who underwent follow-up CMR (median 1.11 years, IQR 0.78). At both baseline and follow-up, the high-volume-low-mass group had worse prognosis than the low-volume-low-mass group (p<0.001). With PAH therapy, 73.5% of low-volume-low-mass patients remained in this group, whereas only 17.4% of high-volume-low-mass patients transitioned into low-volume-low-mass. CONCLUSIONS Right ventricular adaptation assessed using CMR has prognostic value in patients with PAH. Patients with maladaptive remodelling (high-volume-low-mass) are at high risk of treatment failure.
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Affiliation(s)
- Ze Ming Goh
- Department of Infection, Immunity and Cardiovascular Disease, The University of Sheffield, Sheffield, UK
| | - Nithin Balasubramanian
- Department of Infection, Immunity and Cardiovascular Disease, The University of Sheffield, Sheffield, UK
| | - Samer Alabed
- Department of Infection, Immunity and Cardiovascular Disease, The University of Sheffield, Sheffield, UK
- Radiology Department, Sheffield Teaching Hospitals NHS Trust, Sheffield, UK
| | - Krit Dwivedi
- Department of Infection, Immunity and Cardiovascular Disease, The University of Sheffield, Sheffield, UK
- INSIGNEO, Institute of Insilico Medicine, Sheffield, UK
| | - Yousef Shahin
- Department of Infection, Immunity and Cardiovascular Disease, The University of Sheffield, Sheffield, UK
- Radiology Department, Sheffield Teaching Hospitals NHS Trust, Sheffield, UK
| | - Alexander M K Rothman
- Department of Infection, Immunity and Cardiovascular Disease, The University of Sheffield, Sheffield, UK
| | - Pankaj Garg
- Department of Infection, Immunity and Cardiovascular Disease, The University of Sheffield, Sheffield, UK
- Norwich Medical School, University of East Anglia, Norwich, UK
| | - Allan Lawrie
- Department of Infection, Immunity and Cardiovascular Disease, The University of Sheffield, Sheffield, UK
| | - David Capener
- Department of Infection, Immunity and Cardiovascular Disease, The University of Sheffield, Sheffield, UK
| | - A A Roger Thompson
- Department of Infection, Immunity and Cardiovascular Disease, The University of Sheffield, Sheffield, UK
| | - Faisal Alandejani
- Department of Infection, Immunity and Cardiovascular Disease, The University of Sheffield, Sheffield, UK
| | - Jim M Wild
- Department of Infection, Immunity and Cardiovascular Disease, The University of Sheffield, Sheffield, UK
- INSIGNEO, Institute of Insilico Medicine, Sheffield, UK
| | | | - Robert A Lewis
- Sheffield Pulmonary Vascular Disease Unit, Sheffield Teaching Hospitals NHS Foundation Trust, Sheffield, UK
| | - Rebecca Gosling
- Department of Infection, Immunity and Cardiovascular Disease, The University of Sheffield, Sheffield, UK
| | - Michael Sharkey
- Department of Infection, Immunity and Cardiovascular Disease, The University of Sheffield, Sheffield, UK
| | - Robin Condliffe
- INSIGNEO, Institute of Insilico Medicine, Sheffield, UK
- Sheffield Pulmonary Vascular Disease Unit, Sheffield Teaching Hospitals NHS Foundation Trust, Sheffield, UK
| | - David G Kiely
- Department of Infection, Immunity and Cardiovascular Disease, The University of Sheffield, Sheffield, UK
- INSIGNEO, Institute of Insilico Medicine, Sheffield, UK
- Sheffield Pulmonary Vascular Disease Unit, Sheffield Teaching Hospitals NHS Foundation Trust, Sheffield, UK
| | - Andrew J Swift
- Department of Infection, Immunity and Cardiovascular Disease, The University of Sheffield, Sheffield, UK
- Radiology Department, Sheffield Teaching Hospitals NHS Trust, Sheffield, UK
- INSIGNEO, Institute of Insilico Medicine, Sheffield, UK
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9
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Shahin Y, Alabed S, Rehan Quadery S, Lewis RA, Johns C, Alkhanfar D, Sukhanenko M, Alandejani F, Garg P, Elliot CA, Hameed A, Charalampopoulos A, Wild JM, Condliffe R, Swift AJ, Kiely DG. CMR Measures of Left Atrial Volume Index and Right Ventricular Function Have Prognostic Value in Chronic Thromboembolic Pulmonary Hypertension. Front Med (Lausanne) 2022; 9:840196. [PMID: 35360708 PMCID: PMC8964043 DOI: 10.3389/fmed.2022.840196] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2021] [Accepted: 02/04/2022] [Indexed: 11/13/2022] Open
Abstract
Providing prognostic information is important when counseling patients and planning treatment strategies in chronic thromboembolic pulmonary hypertension (CTEPH). The aim of this study was to assess the prognostic value of gold standard imaging of cardiac structure and function using cardiac magnetic resonance imaging (CMR) in CTEPH. Consecutive treatment-naive patients with CTEPH who underwent right heart catheterization and CMR between 2011 and 2017 were identified from the ASPIRE (Assessing-the-Specturm-of-Pulmonary-hypertensIon-at-a-REferral-center) registry. CMR metrics were corrected for age and sex where appropriate. Univariate and multivariate regression models were generated to assess the prognostic ability of CMR metrics in CTEPH. Three hundred and seventy-five patients (mean+/-standard deviation: age 64+/-14 years, 49% female) were identified and 181 (48%) had pulmonary endarterectomy (PEA). For all patients with CTEPH, left-ventricular-stroke-volume-index-%predicted (LVSVI%predicted) (p = 0.040), left-atrial-volume-index (LAVI) (p = 0.030), the presence of comorbidities, incremental shuttle walking test distance (ISWD), mixed venous oxygen saturation and undergoing PEA were independent predictors of mortality at multivariate analysis. In patients undergoing PEA, LAVI (p < 0.010), ISWD and comorbidities and in patients not undergoing surgery, right-ventricular-ejection-fraction-%predicted (RVEF%pred) (p = 0.040), age and ISWD were independent predictors of mortality. CMR metrics reflecting cardiac function and left heart disease have prognostic value in CTEPH. In those undergoing PEA, LAVI predicts outcome whereas in patients not undergoing PEA RVEF%pred predicts outcome. This study highlights the prognostic value of imaging cardiac structure and function in CTEPH and the importance of considering left heart disease in patients considered for PEA.
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Affiliation(s)
- Yousef Shahin
- Department of Infection, Immunity and Cardiovascular Disease, University of Sheffield, Sheffield, United Kingdom.,Department of Clinical Radiology, Sheffield Teaching Hospitals NHS FT, Sheffield, United Kingdom
| | - Samer Alabed
- Department of Infection, Immunity and Cardiovascular Disease, University of Sheffield, Sheffield, United Kingdom.,Department of Clinical Radiology, Sheffield Teaching Hospitals NHS FT, Sheffield, United Kingdom
| | - Syed Rehan Quadery
- Sheffield Pulmonary Vascular Disease Unit, Royal Hallamshire Hospital, Sheffield Teaching Hospitals NHS FT, Sheffield, United Kingdom
| | - Robert A Lewis
- Sheffield Pulmonary Vascular Disease Unit, Royal Hallamshire Hospital, Sheffield Teaching Hospitals NHS FT, Sheffield, United Kingdom
| | - Christopher Johns
- Department of Clinical Radiology, Sheffield Teaching Hospitals NHS FT, Sheffield, United Kingdom
| | - Dheyaa Alkhanfar
- Department of Infection, Immunity and Cardiovascular Disease, University of Sheffield, Sheffield, United Kingdom
| | - Maria Sukhanenko
- Department of Clinical Radiology, Sheffield Teaching Hospitals NHS FT, Sheffield, United Kingdom
| | - Faisal Alandejani
- Department of Infection, Immunity and Cardiovascular Disease, University of Sheffield, Sheffield, United Kingdom
| | - Pankaj Garg
- Department of Infection, Immunity and Cardiovascular Disease, University of Sheffield, Sheffield, United Kingdom
| | - Charlie A Elliot
- Sheffield Pulmonary Vascular Disease Unit, Royal Hallamshire Hospital, Sheffield Teaching Hospitals NHS FT, Sheffield, United Kingdom
| | - Abdul Hameed
- Department of Infection, Immunity and Cardiovascular Disease, University of Sheffield, Sheffield, United Kingdom.,Sheffield Pulmonary Vascular Disease Unit, Royal Hallamshire Hospital, Sheffield Teaching Hospitals NHS FT, Sheffield, United Kingdom
| | - Athaniosis Charalampopoulos
- Sheffield Pulmonary Vascular Disease Unit, Royal Hallamshire Hospital, Sheffield Teaching Hospitals NHS FT, Sheffield, United Kingdom
| | - James M Wild
- Department of Infection, Immunity and Cardiovascular Disease, University of Sheffield, Sheffield, United Kingdom.,INSIGNEO, Institute for in silico Medicine, University of Sheffield, Sheffield, United Kingdom
| | - Robin Condliffe
- Sheffield Pulmonary Vascular Disease Unit, Royal Hallamshire Hospital, Sheffield Teaching Hospitals NHS FT, Sheffield, United Kingdom
| | - Andrew J Swift
- Department of Infection, Immunity and Cardiovascular Disease, University of Sheffield, Sheffield, United Kingdom.,Department of Clinical Radiology, Sheffield Teaching Hospitals NHS FT, Sheffield, United Kingdom.,INSIGNEO, Institute for in silico Medicine, University of Sheffield, Sheffield, United Kingdom
| | - David G Kiely
- Department of Infection, Immunity and Cardiovascular Disease, University of Sheffield, Sheffield, United Kingdom.,Sheffield Pulmonary Vascular Disease Unit, Royal Hallamshire Hospital, Sheffield Teaching Hospitals NHS FT, Sheffield, United Kingdom.,INSIGNEO, Institute for in silico Medicine, University of Sheffield, Sheffield, United Kingdom
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10
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Alandejani F, Hameed A, Tubman E, Alabed S, Shahin Y, Lewis RA, Dwivedi K, Mahmood A, Middleton J, Watson L, Alkhanfar D, Johns CS, Rajaram S, Garg P, Condliffe R, Elliot CA, Thompson AAR, Rothman AMK, Charalampopoulos A, Lawrie A, Wild JM, Swift AJ, Kiely DG. Imaging and Risk Stratification in Pulmonary Arterial Hypertension: Time to Include Right Ventricular Assessment. Front Cardiovasc Med 2022; 9:797561. [PMID: 35402574 PMCID: PMC8989834 DOI: 10.3389/fcvm.2022.797561] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2021] [Accepted: 02/28/2022] [Indexed: 11/13/2022] Open
Abstract
Background Current European Society of Cardiology and European Respiratory Society guidelines recommend regular risk stratification with an aim of treating patients with pulmonary arterial hypertension (PAH) to improve or maintain low-risk status (<5% 1-year mortality). Methods Consecutive patients with PAH who underwent cardiac magnetic resonance imaging (cMRI) were identified from the Assessing the Spectrum of Pulmonary hypertension Identified at a Referral centre (ASPIRE) registry. Kaplan-Meier survival curves, locally weighted scatterplot smoothing regression and multi-variable logistic regression analysis were performed. Results In 311 consecutive, treatment-naïve patients with PAH undergoing cMRI including 121 undergoing follow-up cMRI, measures of right ventricular (RV) function including right ventricular ejection fraction (RVEF) and RV end systolic volume and right atrial (RA) area had prognostic value. However, only RV metrics were able to identify a low-risk status. Age (p < 0.01) and RVEF (p < 0.01) but not RA area were independent predictors of 1-year mortality. Conclusion This study highlights the need for guidelines to include measures of RV function rather than RA area alone to aid the risk stratification of patients with PAH.
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Affiliation(s)
- Faisal Alandejani
- Department of Infection, Immunity and Cardiovascular Disease, University of Sheffield, Sheffield, United Kingdom
| | - Abdul Hameed
- Department of Infection, Immunity and Cardiovascular Disease, University of Sheffield, Sheffield, United Kingdom.,Sheffield Pulmonary Vascular Disease Unit, Royal Hallamshire Hospital, Sheffield Teaching Hospitals NHS Foundation Trust, Sheffield, United Kingdom
| | - Euan Tubman
- Department of Infection, Immunity and Cardiovascular Disease, University of Sheffield, Sheffield, United Kingdom
| | - Samer Alabed
- Department of Infection, Immunity and Cardiovascular Disease, University of Sheffield, Sheffield, United Kingdom.,Institute for in silico Medicine (INSIGNEO), University of Sheffield, Sheffield, United Kingdom
| | - Yousef Shahin
- Department of Infection, Immunity and Cardiovascular Disease, University of Sheffield, Sheffield, United Kingdom.,Institute for in silico Medicine (INSIGNEO), University of Sheffield, Sheffield, United Kingdom
| | - Robert A Lewis
- Department of Infection, Immunity and Cardiovascular Disease, University of Sheffield, Sheffield, United Kingdom.,Sheffield Pulmonary Vascular Disease Unit, Royal Hallamshire Hospital, Sheffield Teaching Hospitals NHS Foundation Trust, Sheffield, United Kingdom
| | - Krit Dwivedi
- Department of Infection, Immunity and Cardiovascular Disease, University of Sheffield, Sheffield, United Kingdom
| | - Aqeeb Mahmood
- Department of Infection, Immunity and Cardiovascular Disease, University of Sheffield, Sheffield, United Kingdom
| | - Jennifer Middleton
- Department of Infection, Immunity and Cardiovascular Disease, University of Sheffield, Sheffield, United Kingdom.,Sheffield Pulmonary Vascular Disease Unit, Royal Hallamshire Hospital, Sheffield Teaching Hospitals NHS Foundation Trust, Sheffield, United Kingdom
| | - Lisa Watson
- Sheffield Pulmonary Vascular Disease Unit, Royal Hallamshire Hospital, Sheffield Teaching Hospitals NHS Foundation Trust, Sheffield, United Kingdom
| | - Dheyaa Alkhanfar
- Department of Infection, Immunity and Cardiovascular Disease, University of Sheffield, Sheffield, United Kingdom
| | - Christopher S Johns
- Department of Infection, Immunity and Cardiovascular Disease, University of Sheffield, Sheffield, United Kingdom
| | - Smitha Rajaram
- Department of Infection, Immunity and Cardiovascular Disease, University of Sheffield, Sheffield, United Kingdom
| | - Pankaj Garg
- Norwich Medical School, University of East Anglia, Norwich, United Kingdom
| | - Robin Condliffe
- Sheffield Pulmonary Vascular Disease Unit, Royal Hallamshire Hospital, Sheffield Teaching Hospitals NHS Foundation Trust, Sheffield, United Kingdom
| | - Charlie A Elliot
- Sheffield Pulmonary Vascular Disease Unit, Royal Hallamshire Hospital, Sheffield Teaching Hospitals NHS Foundation Trust, Sheffield, United Kingdom
| | - A A Roger Thompson
- Department of Infection, Immunity and Cardiovascular Disease, University of Sheffield, Sheffield, United Kingdom.,Sheffield Pulmonary Vascular Disease Unit, Royal Hallamshire Hospital, Sheffield Teaching Hospitals NHS Foundation Trust, Sheffield, United Kingdom
| | - Alexander M K Rothman
- Department of Infection, Immunity and Cardiovascular Disease, University of Sheffield, Sheffield, United Kingdom.,Sheffield Pulmonary Vascular Disease Unit, Royal Hallamshire Hospital, Sheffield Teaching Hospitals NHS Foundation Trust, Sheffield, United Kingdom.,Institute for in silico Medicine (INSIGNEO), University of Sheffield, Sheffield, United Kingdom
| | - Athanasios Charalampopoulos
- Sheffield Pulmonary Vascular Disease Unit, Royal Hallamshire Hospital, Sheffield Teaching Hospitals NHS Foundation Trust, Sheffield, United Kingdom
| | - Allan Lawrie
- Department of Infection, Immunity and Cardiovascular Disease, University of Sheffield, Sheffield, United Kingdom
| | - Jim M Wild
- Department of Infection, Immunity and Cardiovascular Disease, University of Sheffield, Sheffield, United Kingdom.,Institute for in silico Medicine (INSIGNEO), University of Sheffield, Sheffield, United Kingdom
| | - Andrew J Swift
- Department of Infection, Immunity and Cardiovascular Disease, University of Sheffield, Sheffield, United Kingdom.,Institute for in silico Medicine (INSIGNEO), University of Sheffield, Sheffield, United Kingdom
| | - David G Kiely
- Department of Infection, Immunity and Cardiovascular Disease, University of Sheffield, Sheffield, United Kingdom.,Sheffield Pulmonary Vascular Disease Unit, Royal Hallamshire Hospital, Sheffield Teaching Hospitals NHS Foundation Trust, Sheffield, United Kingdom.,Institute for in silico Medicine (INSIGNEO), University of Sheffield, Sheffield, United Kingdom
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11
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Allen JL, Sanders TJ, Plathe R, Appadoo D, Horvat J, Lewis RA. Temperature-dependent terahertz spectroscopy of l-phenylalanine. Spectrochim Acta A Mol Biomol Spectrosc 2021; 260:119922. [PMID: 34058666 DOI: 10.1016/j.saa.2021.119922] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/27/2021] [Revised: 05/04/2021] [Accepted: 05/04/2021] [Indexed: 06/12/2023]
Abstract
Undiluted l-phenylalanine has been cooled to 6K and its transmission spectrum obtained under terahertz radiation from a synchrotron source. Three distinct absorption bands are evident: at 1.37, 2.14, and 2.32THz. Each of these tracks to lower frequency ("redshifts") as the temperature is increased from 6 to 250K. The observed shifts are in the range of 0.1-0.2THz. The form of the temperature dependence is well accounted for by a Bose-Einstein model, from which the zero-temperature frequency of each mode and the characteristic temperature of the associated phonon bath may be estimated. At 6K a fourth band is evident, at 2.65THz. However, the depth of this, touching the noise floor, coupled with the increasing opacity of the sample with temperature for frequencies beyond 2.5THz, makes it difficult to track. The frequencies of all four modes are in good accord with and thus confirm a previous calculation.
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Affiliation(s)
- J L Allen
- Institute for Superconducting and Electronic Materials and School of Physics, University of Wollongong, NSW 2522, Australia.
| | - T J Sanders
- Institute for Superconducting and Electronic Materials and School of Physics, University of Wollongong, NSW 2522, Australia
| | - R Plathe
- Australian Synchrotron, Australian Nuclear Science and Technology Organisation, 800 Blackburn Rd Clayton, VIC 3168, Australia
| | - D Appadoo
- Australian Synchrotron, Australian Nuclear Science and Technology Organisation, 800 Blackburn Rd Clayton, VIC 3168, Australia
| | - J Horvat
- Institute for Superconducting and Electronic Materials and School of Physics, University of Wollongong, NSW 2522, Australia
| | - R A Lewis
- Institute for Superconducting and Electronic Materials and School of Physics, University of Wollongong, NSW 2522, Australia
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12
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Sanders TJ, Allen JL, Horvat J, Lewis RA. High-quality, temperature-dependent terahertz spectroscopy of single crystalline L-alanine: Experiment and density-functional theory. J Chem Phys 2021; 154:244311. [PMID: 34241345 DOI: 10.1063/5.0054063] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
For the first time, the terahertz transmittance spectra of l-alanine have been measured using a single crystal. Measurements were obtained over a large temperature range (12-300 K) and revealed 18 absorptions between 20 and 250 cm-1. These modes were sharp and symmetric, a feature of single crystals and low temperatures. The spectra were directly compared to those of a powdered pellet sample. Raman spectroscopy and x-ray diffraction were used to confirm the sample's structure and purity. With increasing temperature, all modes exhibit spectral redshift, well described by a Bose-Einstein model, indicating the phonon origin of the absorptions. The exceptions are the 91 and 128 cm-1 modes. The former blueshifts. The latter initially blueshifts but transitions to redshifting. Both behaviors are anomalous. Density-functional theory modeling helped assign all the observed modes.
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Affiliation(s)
- T J Sanders
- Institute for Superconducting and Electronic Materials and School of Physics, University of Wollongong, Wollongong, New South Wales 2522, Australia
| | - J L Allen
- Institute for Superconducting and Electronic Materials and School of Physics, University of Wollongong, Wollongong, New South Wales 2522, Australia
| | - J Horvat
- Institute for Superconducting and Electronic Materials and School of Physics, University of Wollongong, Wollongong, New South Wales 2522, Australia
| | - R A Lewis
- Institute for Superconducting and Electronic Materials and School of Physics, University of Wollongong, Wollongong, New South Wales 2522, Australia
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13
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Sanders TJ, Allen JL, Plathe R, Horvat J, Lewis RA. The 3, 5, 6, and 7 THz resonances of α-glycine. Spectrochim Acta A Mol Biomol Spectrosc 2021; 253:119544. [PMID: 33631628 DOI: 10.1016/j.saa.2021.119544] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/22/2020] [Revised: 01/22/2021] [Accepted: 01/24/2021] [Indexed: 06/12/2023]
Abstract
Using an optically thin single crystal sample, mounted in a cryostat permitting cooling to 6 K, and a synchrotron as a bright light source, exceptionally well defined absorption spectra of well-characterised α-glycine have been obtained in the spectral range 2.5-7.5 THz (approximately 80-240 cm-1). Four separate resonances have been observed, respectively at 93, 152, 188, and 223 cm-1 at the lowest temperature. Each reduces in frequency (redshifts) as temperature increases. The origin of this observed behaviour is attributed to a phonon-mediated anharmonicity in the crystal potential.
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Affiliation(s)
- T J Sanders
- Institute for Superconducting and Electronic Materials and School of Physics, University of Wollongong, NSW 2522, Australia.
| | - J L Allen
- Institute for Superconducting and Electronic Materials and School of Physics, University of Wollongong, NSW 2522, Australia
| | - R Plathe
- Australian Synchrotron, Australian Nuclear Science and Technology Organisation, 800 Blackburn Rd Clayton, VIC 3168, Australia
| | - J Horvat
- Institute for Superconducting and Electronic Materials and School of Physics, University of Wollongong, NSW 2522, Australia
| | - R A Lewis
- Institute for Superconducting and Electronic Materials and School of Physics, University of Wollongong, NSW 2522, Australia
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14
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Lewis RA, Armstrong I, Bergbaum C, Brewis MJ, Cannon J, Charalampopoulos A, Church AC, Coghlan JG, Davies RJ, Dimopoulos K, Elliot C, Gibbs JSR, Gin-Sing W, Haji G, Hameed AG, Howard LS, Johnson MK, Kempny A, Kiely DG, Lo Giudice F, McCabe C, Peacock AJ, Peleyeju O, Pepke-Zaba J, Polwarth G, Price L, Sabroe I, Schreiber BE, Sheares K, Taboada D, Thompson AAR, Toshner MR, Wanjiku I, Wort SJ, Yorke J, Condliffe R. EmPHasis-10 health-related quality of life score predicts outcomes in patients with idiopathic and connective tissue disease-associated pulmonary arterial hypertension: results from a UK multicentre study. Eur Respir J 2021; 57:13993003.00124-2020. [PMID: 32631835 PMCID: PMC7905834 DOI: 10.1183/13993003.00124-2020] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2020] [Accepted: 05/28/2020] [Indexed: 01/09/2023]
Abstract
Health-related quality of life (HRQoL) scores assess symptom burden in pulmonary arterial hypertension (PAH) but data regarding their role in prognostication and risk stratification are limited. We assessed these relationships using the emPHasis-10 HRQoL measure.1745 patients with idiopathic PAH (IPAH), drug-induced PAH (DPAH), heritable PAH (HPAH) (collectively "(I/D/H)PAH"), or connective tissue disease-associated PAH (CTD-PAH), who had completed emPHasis-10 questionnaires at one of six UK referral centres between 2014 and 2017, were identified. Correlations with exercise capacity and World Health Organization (WHO) functional class were assessed, and exploratory risk stratification thresholds were tested.Moderate correlations were seen between emPHasis-10 scores and 6-min walk distance (r=-0.546), incremental shuttle walk distance (r=-0.504) and WHO functional class (r=0.497) (all p<0.0001). Distribution of emPHasis-10 score differed significantly between each WHO functional class (all p<0.0001). On multivariate analysis, emPHasis-10 score, but not WHO functional class, was an independent predictor of mortality. In a risk stratification approach, scores of 0-16, 17-33 and 34-50 identified incident patients with 1-year mortality of 5%, 10% and 23%, respectively. Survival of patients in WHO functional class III could be further stratified using an emPHasis-10 score ≥34 (p<0.01). At follow-up, patients with improved emPHasis-10 scores had improved exercise capacity (p<0.0001) and patients who transitioned between risk groups demonstrated similar survival to patients originally in those risk groups.The emPHasis-10 score is an independent prognostic marker in patients with (I/D/H)PAH or CTD-PAH. It has utility in risk stratification in addition to currently used parameters. Improvement in emPHasis-10 score is associated with improved exercise capacity.
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Affiliation(s)
- Robert A Lewis
- Sheffield Pulmonary Vascular Disease Unit, Royal Hallamshire Hospital, Sheffield, UK.,Dept of Infection, Immunity and Cardiovascular Disease, University of Sheffield, Sheffield, UK
| | - Iain Armstrong
- Sheffield Pulmonary Vascular Disease Unit, Royal Hallamshire Hospital, Sheffield, UK
| | - Carmel Bergbaum
- National Pulmonary Hypertension Service, Royal Brompton Hospital and Imperial College, London, UK
| | - Melanie J Brewis
- Scottish Pulmonary Vascular Unit, Golden Jubilee National Hospital, Glasgow, UK
| | - John Cannon
- Pulmonary Vascular Disease Unit, Royal Papworth Hospital, Cambridge, UK
| | | | - A Colin Church
- Scottish Pulmonary Vascular Unit, Golden Jubilee National Hospital, Glasgow, UK
| | - J Gerry Coghlan
- Pulmonary Hypertension Unit, Royal Free Hospital, London, UK
| | - Rachel J Davies
- National Pulmonary Hypertension Service, Hammersmith Hospital, London, UK
| | - Konstantinos Dimopoulos
- National Pulmonary Hypertension Service, Royal Brompton Hospital and Imperial College, London, UK
| | - Charlie Elliot
- Sheffield Pulmonary Vascular Disease Unit, Royal Hallamshire Hospital, Sheffield, UK
| | - J Simon R Gibbs
- National Pulmonary Hypertension Service, Hammersmith Hospital, London, UK
| | - Wendy Gin-Sing
- National Pulmonary Hypertension Service, Hammersmith Hospital, London, UK
| | - Gulam Haji
- National Pulmonary Hypertension Service, Hammersmith Hospital, London, UK
| | - Abdul G Hameed
- Sheffield Pulmonary Vascular Disease Unit, Royal Hallamshire Hospital, Sheffield, UK.,Dept of Infection, Immunity and Cardiovascular Disease, University of Sheffield, Sheffield, UK
| | - Luke S Howard
- National Pulmonary Hypertension Service, Hammersmith Hospital, London, UK
| | - Martin K Johnson
- Scottish Pulmonary Vascular Unit, Golden Jubilee National Hospital, Glasgow, UK
| | - Aleksander Kempny
- National Pulmonary Hypertension Service, Royal Brompton Hospital and Imperial College, London, UK
| | - David G Kiely
- Sheffield Pulmonary Vascular Disease Unit, Royal Hallamshire Hospital, Sheffield, UK.,Dept of Infection, Immunity and Cardiovascular Disease, University of Sheffield, Sheffield, UK
| | | | - Colm McCabe
- National Pulmonary Hypertension Service, Royal Brompton Hospital and Imperial College, London, UK
| | - Andrew J Peacock
- Scottish Pulmonary Vascular Unit, Golden Jubilee National Hospital, Glasgow, UK
| | | | - Joanna Pepke-Zaba
- Pulmonary Vascular Disease Unit, Royal Papworth Hospital, Cambridge, UK
| | - Gary Polwarth
- Pulmonary Vascular Disease Unit, Royal Papworth Hospital, Cambridge, UK
| | - Laura Price
- National Pulmonary Hypertension Service, Royal Brompton Hospital and Imperial College, London, UK
| | - Ian Sabroe
- Sheffield Pulmonary Vascular Disease Unit, Royal Hallamshire Hospital, Sheffield, UK.,Dept of Infection, Immunity and Cardiovascular Disease, University of Sheffield, Sheffield, UK
| | | | - Karen Sheares
- Pulmonary Vascular Disease Unit, Royal Papworth Hospital, Cambridge, UK
| | - Dolores Taboada
- Pulmonary Vascular Disease Unit, Royal Papworth Hospital, Cambridge, UK
| | - A A Roger Thompson
- Sheffield Pulmonary Vascular Disease Unit, Royal Hallamshire Hospital, Sheffield, UK.,Dept of Infection, Immunity and Cardiovascular Disease, University of Sheffield, Sheffield, UK
| | - Mark R Toshner
- Pulmonary Vascular Disease Unit, Royal Papworth Hospital, Cambridge, UK
| | - Ivy Wanjiku
- Pulmonary Hypertension Unit, Royal Free Hospital, London, UK
| | - S John Wort
- National Pulmonary Hypertension Service, Royal Brompton Hospital and Imperial College, London, UK
| | - Janelle Yorke
- School of Nursing, Midwifery and Social Work, University of Manchester, Manchester, UK
| | - Robin Condliffe
- Sheffield Pulmonary Vascular Disease Unit, Royal Hallamshire Hospital, Sheffield, UK
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15
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Abstract
The terahertz (THz) spectrum of dl-alanine has been measured for the first time at cryogenic temperatures and with a pure sample. Several sharp absorptions are observed, over a wide frequency range (0.8-4.8 THz), at 8 K. The sample structure and purity were confirmed with both Raman spectroscopy and X-ray diffraction. Temperature dependent spectra revealed redshifting, with increasing temperature, for all modes except one at 2.70 THz. This mode exhibits blueshifting until ≈120 K, where it starts to redshift. A Bose-Einstein distribution has been used to model the frequency shift with temperature for the four lowest energy modes. Strong correlations between the fits and data indicate that these modes are caused by phonon excitation in an anharmonic potential. Density functional theory has also been used to identify the origin of these low frequency modes. They are attributed to large scale molecular vibrations.
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Affiliation(s)
- T J Sanders
- Institute of Superconducting and Electronic Materials, School of Physics, University of Wollongong, Wollongong, NSW 2522, Australia.
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16
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Allen JL, Sanders TJ, Horvat J, Lewis RA. Anharmonicity-driven redshift and broadening of sharp terahertz features of α-glycine single crystal from 20 K to 300 K: Theory and experiment. Spectrochim Acta A Mol Biomol Spectrosc 2021; 244:118635. [PMID: 32858447 DOI: 10.1016/j.saa.2020.118635] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/25/2020] [Revised: 06/16/2020] [Accepted: 06/19/2020] [Indexed: 06/11/2023]
Abstract
For the first time, large single crystals of the simplest amino acid, glycine, have been used to determine the temperature dependence of its terahertz spectrum. High-quality spectra with very sharp absorption features are observed at cryogenic temperatures. The α-glycine structure and the purity of the crystals were verified via Raman spectroscopy and X-ray diffraction. Spectral redshift with increasing temperature was observed for all absorption bands in the terahertz region (10-250 cm-1, or 1-8 THz) over the temperature range of 20-300 K. X-ray diffraction revealed expansion in all planes of the crystal lattice over the same temperature range. A Bose-Einstein distribution was used to model the frequency position shift of the two lowest-energy fundamental modes at 50 cm-1 and 69 cm-1. On this basis, we attribute the observed redshift and broadening with increasing temperature to the anharmonic potential associated with the phonon bath.
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Affiliation(s)
- J L Allen
- Institute for Superconducting and Electronic Materials, School of Physics, University of Wollongong, Wollongong, NSW 2522, Australia.
| | - T J Sanders
- Institute for Superconducting and Electronic Materials, School of Physics, University of Wollongong, Wollongong, NSW 2522, Australia
| | - J Horvat
- Institute for Superconducting and Electronic Materials, School of Physics, University of Wollongong, Wollongong, NSW 2522, Australia
| | - R A Lewis
- Institute for Superconducting and Electronic Materials, School of Physics, University of Wollongong, Wollongong, NSW 2522, Australia
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17
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Abstract
OBJECTIVE To estimate the daily dietary energy intake for me to maintain a constant body weight. How hard can it be? DESIGN Very introspective study. SETTING At home. In lockdown. (Except every Tuesday afternoon and Saturday morning, when I went for a run.) PARTICIPANTS: Me. n=1. MAIN OUTCOME MEASURES My weight, measured each day. RESULTS Sleeping, I shed about a kilogram each night (1.07 (SD 0.25) kg). Running 5 km, I shed about half a kilogram (0.57 (SD 0.15) kg). My daily equilibrium energy intake is about 10 000 kJ (10 286 (SD 201) kJ). Every kJ above (or below) 10 000 kJ adds (or subtracts) about 40 mg (35.4 (SD 3.2) mg). CONCLUSIONS Body weight data show persistent variability, even when the screws of control are tightened and tightened.
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Affiliation(s)
- R A Lewis
- School of Physics, Faculty of Engineering and Information Sciences, University of Wollongong, Wollongong NSW 2522, Australia
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18
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Condliffe R, Kiely DG, Lewis RA. Mild parenchymal lung disease is still lung disease. Eur Respir J 2020; 56:56/5/2003727. [DOI: 10.1183/13993003.03727-2020] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2020] [Accepted: 10/05/2020] [Indexed: 11/05/2022]
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Alabed S, Shahin Y, Garg P, Alandejani F, Johns CS, Lewis RA, Condliffe R, Wild JM, Kiely DG, Swift AJ. Cardiac-MRI Predicts Clinical Worsening and Mortality in Pulmonary Arterial Hypertension: A Systematic Review and Meta-Analysis. JACC Cardiovasc Imaging 2020; 14:931-942. [PMID: 33008758 PMCID: PMC7525356 DOI: 10.1016/j.jcmg.2020.08.013] [Citation(s) in RCA: 58] [Impact Index Per Article: 14.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/20/2020] [Revised: 08/17/2020] [Accepted: 08/21/2020] [Indexed: 12/21/2022]
Abstract
Objectives This meta-analysis evaluates assessment of pulmonary arterial hypertension (PAH), with a focus on clinical worsening and mortality. Background Cardiac magnetic resonance (CMR) has prognostic value in the assessment of patients with PAH. However, there are limited data on the prediction of clinical worsening, an important composite endpoint used in PAH therapy trials. Methods The Cochrane Central Register of Controlled Trials, MEDLINE, EMBASE, and Web of Science databases were searched in May 2020. All CMR studies assessing clinical worsening and the prognosis of patients with PAH were included. Pooled hazard ratios of univariate regression analyses for CMR measurements, for prediction of clinical worsening and mortality, were calculated. Results Twenty-two studies with 1,938 participants were included in the meta-analysis. There were 18 clinical worsening events and 8 deaths per 100 patient-years. The pooled hazard ratios show that every 1% decrease in right ventricular (RV) ejection fraction is associated with a 4.9% increase in the risk of clinical worsening over 22 months of follow-up and a 2.1% increase in the risk of death over 54 months. For every 1 ml/m2 increase in RV end-systolic volume index or RV end-diastolic volume index, the risk of clinical worsening increases by 1.3% and 1%, respectively, and the risk of mortality increases by 0.9% and 0.6%. Every 1 ml/m2 decrease in left ventricular stroke volume index or left ventricular end-diastolic volume index increased the risk of death by 2.5% and 1.8%. Left ventricular parameters were not associated with clinical worsening. Conclusions This review confirms CMR as a powerful prognostic marker in PAH in a large cohort of patients. In addition to confirming previous observations that RV function and RV and left ventricular volumes predict mortality, RV function and volumes also predict clinical worsening. This study provides a strong rationale for considering CMR as a clinically relevant endpoint for trials of PAH therapies.
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Affiliation(s)
- Samer Alabed
- Department of Infection, Immunity and Cardiovascular Disease, University of Sheffield, Sheffield, United Kingdom; Department of Clinical Radiology, Sheffield Teaching Hospitals, Sheffield, United Kingdom.
| | - Yousef Shahin
- Department of Infection, Immunity and Cardiovascular Disease, University of Sheffield, Sheffield, United Kingdom; Department of Clinical Radiology, Sheffield Teaching Hospitals, Sheffield, United Kingdom
| | - Pankaj Garg
- Department of Infection, Immunity and Cardiovascular Disease, University of Sheffield, Sheffield, United Kingdom
| | - Faisal Alandejani
- Department of Infection, Immunity and Cardiovascular Disease, University of Sheffield, Sheffield, United Kingdom
| | - Christopher S Johns
- Department of Infection, Immunity and Cardiovascular Disease, University of Sheffield, Sheffield, United Kingdom; Department of Clinical Radiology, Sheffield Teaching Hospitals, Sheffield, United Kingdom
| | - Robert A Lewis
- Department of Infection, Immunity and Cardiovascular Disease, University of Sheffield, Sheffield, United Kingdom; Sheffield Pulmonary Vascular Disease Unit, Royal Hallamshire Hospital, Sheffield, United Kingdom
| | - Robin Condliffe
- Sheffield Pulmonary Vascular Disease Unit, Royal Hallamshire Hospital, Sheffield, United Kingdom
| | - James M Wild
- Department of Infection, Immunity and Cardiovascular Disease, University of Sheffield, Sheffield, United Kingdom; INSIGNEO, Institute for In Silico Medicine, University of Sheffield, United Kingdom
| | - David G Kiely
- Department of Infection, Immunity and Cardiovascular Disease, University of Sheffield, Sheffield, United Kingdom; Sheffield Pulmonary Vascular Disease Unit, Royal Hallamshire Hospital, Sheffield, United Kingdom; INSIGNEO, Institute for In Silico Medicine, University of Sheffield, United Kingdom
| | - Andrew J Swift
- Department of Infection, Immunity and Cardiovascular Disease, University of Sheffield, Sheffield, United Kingdom; Department of Clinical Radiology, Sheffield Teaching Hospitals, Sheffield, United Kingdom; INSIGNEO, Institute for In Silico Medicine, University of Sheffield, United Kingdom
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20
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Squires AD, Zaczek AJ, Lewis RA, Korter TM. Identifying and explaining vibrational modes of quinacridones via temperature-resolved terahertz spectroscopy: absorption experiments and solid-state density functional theory simulations. Phys Chem Chem Phys 2020; 22:19672-19679. [PMID: 32830208 DOI: 10.1039/d0cp03150j] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
Quinacridone and its substituted analogs are pigments widely used in art and industry. The temperature dependence of the crystal structures of two quinacridone polymorphs (β and γ), along with the common variant 2,9-dimethylquinacridone, were investigated using powder X-ray diffraction and terahertz spectroscopy. These were then compared with solid-state density functional theory simulations of both structures and vibrations. X-ray patterns were collected at eight temperatures in the range 13-298 K and terahertz spectra at fifteen temperatures in the range 20-300 K. Simulations were at absolute zero and at appropriate expansions to model room temperature. It was found that some of the powder X-ray diffraction features in only β-quinacridone (15.7°, 19.7° and 31.2° at 13 K) underwent anomalous shifting with temperature change. We attribute this to the unique coplanar hydrogen bonding pattern of β-quinacridone compared to the other solids, with the unusual diffraction peaks originating from crystallographic planes perpendicular to the a axis intermolecular hydrogen bonds. This observation coincides with a contraction of the a axis with heating and results from its relatively weak N-HO hydrogen bonds and significant C-HH-C repulsions. Associated with this anomalous contraction, for β-quinacridone only spectral peaks are seen to increase in energy with temperature.
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Affiliation(s)
- A D Squires
- Institute for Superconducting and Electronic Materials and School of Physics, University of Wollongong, Wollongong, New South Wales 2522, Australia.
| | - Adam J Zaczek
- Department of Chemistry, Syracuse University, 1-1014 Center for Science and Technology, Syracuse, New York 13244-4100, USA.
| | - R A Lewis
- Institute for Superconducting and Electronic Materials and School of Physics, University of Wollongong, Wollongong, New South Wales 2522, Australia.
| | - Timothy M Korter
- Department of Chemistry, Syracuse University, 1-1014 Center for Science and Technology, Syracuse, New York 13244-4100, USA.
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21
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Lewis RA, Thompson AAR, Billings CG, Charalampopoulos A, Elliot CA, Hamilton N, Hill C, Hurdman J, Rajaram S, Sabroe I, Swift AJ, Kiely DG, Condliffe R. Mild parenchymal lung disease and/or low diffusion capacity impacts survival and treatment response in patients diagnosed with idiopathic pulmonary arterial hypertension. Eur Respir J 2020; 55:2000041. [PMID: 32108045 PMCID: PMC7270350 DOI: 10.1183/13993003.00041-2020] [Citation(s) in RCA: 46] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2019] [Accepted: 02/16/2020] [Indexed: 12/15/2022]
Abstract
There are limited published data defining survival and treatment response in patients with mild lung disease and/or reduced gas transfer who fulfil diagnostic criteria for idiopathic pulmonary arterial hypertension (IPAH).Patients diagnosed with IPAH between 2001 and 2019 were identified in the ASPIRE (Assessing the Spectrum of Pulmonary Hypertension Identified at a Referral Centre) registry. Using prespecified criteria based on computed tomography (CT) imaging and spirometry, patients with a diagnosis of IPAH and no lung disease were termed IPAHno-LD (n=303), and those with minor/mild emphysema or fibrosis were described as IPAHmild-LD (n=190).Survival was significantly better in IPAHno-LD than in IPAHmild-LD (1- and 5-year survival 95% and 70% versus 78% and 22%, respectively; p<0.0001). In the combined group of IPAHno-LD and IPAHmild-LD, independent predictors of higher mortality were increasing age, lower diffusing capacity of the lung for carbon monoxide (D LCO), lower exercise capacity and a diagnosis of IPAHmild-LD (all p<0.05). Exercise capacity and quality of life improved (both p<0.0001) following treatment in patients with IPAHno-LD, but not IPAHmild-LD A proportion of patients with IPAHno-LD had a D LCO <45%; these patients had poorer survival than patients with D LCO ≥45%, although they demonstrated improved exercise capacity following treatment.The presence of even mild parenchymal lung disease in patients who would be classified as IPAH according to current recommendations has a significant adverse effect on outcomes. This phenotype can be identified using lung function testing and clinical CT reports. Patients with IPAH, no lung disease and severely reduced D LCO may represent a further distinct phenotype. These data suggest that randomised controlled trials of targeted therapies in patients with these phenotypes are required.
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Affiliation(s)
- Robert A Lewis
- Sheffield Pulmonary Vascular Disease Unit, Royal Hallamshire Hospital, Sheffield, UK
- Dept of Infection, Immunity and Cardiovascular Disease, University of Sheffield, Sheffield, UK
| | - A A Roger Thompson
- Sheffield Pulmonary Vascular Disease Unit, Royal Hallamshire Hospital, Sheffield, UK
- Dept of Infection, Immunity and Cardiovascular Disease, University of Sheffield, Sheffield, UK
| | - Catherine G Billings
- Sheffield Pulmonary Vascular Disease Unit, Royal Hallamshire Hospital, Sheffield, UK
| | | | - Charlie A Elliot
- Sheffield Pulmonary Vascular Disease Unit, Royal Hallamshire Hospital, Sheffield, UK
| | - Neil Hamilton
- Sheffield Pulmonary Vascular Disease Unit, Royal Hallamshire Hospital, Sheffield, UK
| | - Catherine Hill
- Dept of Academic Radiology, University of Sheffield, Sheffield, UK
| | - Judith Hurdman
- Sheffield Pulmonary Vascular Disease Unit, Royal Hallamshire Hospital, Sheffield, UK
| | - Smitha Rajaram
- Dept of Academic Radiology, University of Sheffield, Sheffield, UK
| | - Ian Sabroe
- Sheffield Pulmonary Vascular Disease Unit, Royal Hallamshire Hospital, Sheffield, UK
- Dept of Infection, Immunity and Cardiovascular Disease, University of Sheffield, Sheffield, UK
| | - Andy J Swift
- Dept of Academic Radiology, University of Sheffield, Sheffield, UK
- Insigneo Institute for in silico Medicine, University of Sheffield, Sheffield, UK
| | - David G Kiely
- Sheffield Pulmonary Vascular Disease Unit, Royal Hallamshire Hospital, Sheffield, UK
- Dept of Infection, Immunity and Cardiovascular Disease, University of Sheffield, Sheffield, UK
- Insigneo Institute for in silico Medicine, University of Sheffield, Sheffield, UK
| | - Robin Condliffe
- Sheffield Pulmonary Vascular Disease Unit, Royal Hallamshire Hospital, Sheffield, UK
- Dept of Infection, Immunity and Cardiovascular Disease, University of Sheffield, Sheffield, UK
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22
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Lewis RA, Durrington C, Condliffe R, Kiely DG. BNP/NT-proBNP in pulmonary arterial hypertension: time for point-of-care testing? Eur Respir Rev 2020; 29:29/156/200009. [PMID: 32414745 DOI: 10.1183/16000617.0009-2020] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2020] [Accepted: 04/06/2020] [Indexed: 12/14/2022] Open
Abstract
Despite the advent of new therapies and improved outcomes in patients with pulmonary arterial hypertension (PAH), it remains a life-shortening disease and the time to diagnosis remains unchanged. Strategies to improve outcomes are therefore currently focused on earlier diagnosis and a treatment approach aimed at moving patients with PAH into a category of low-risk of 1-year mortality. B-type natriuretic peptide (BNP; or brain natriuretic peptide) and N-terminal prohormone of BNP (NT-proBNP) are released from cardiac myocytes in response to mechanical load and wall stress. Elevated levels of BNP and NT-proBNP are incorporated into several PAH risk stratification tools and screening algorithms to aid diagnosis of systemic sclerosis. We have undertaken a systematic review of the literature with respect to the use of BNP and NT-proBNP in PAH and the use of these biomarkers in the diagnosis and risk stratification of PAH, their relation to pulmonary haemodynamics and the potential for point-of-care testing to improve diagnosis and prognosis.
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Affiliation(s)
- Robert A Lewis
- Sheffield Pulmonary Vascular Disease Unit, Royal Hallamshire Hospital, Sheffield, UK.,Dept of Infection, Immunity and Cardiovascular Disease, University of Sheffield, Sheffield, UK
| | - Charlotte Durrington
- Sheffield Pulmonary Vascular Disease Unit, Royal Hallamshire Hospital, Sheffield, UK
| | - Robin Condliffe
- Sheffield Pulmonary Vascular Disease Unit, Royal Hallamshire Hospital, Sheffield, UK
| | - David G Kiely
- Sheffield Pulmonary Vascular Disease Unit, Royal Hallamshire Hospital, Sheffield, UK .,Dept of Infection, Immunity and Cardiovascular Disease, University of Sheffield, Sheffield, UK.,Insigneo Institute for in silico medicine, University of Sheffield, Sheffield, UK
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23
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Lewis RA, Johns CS, Cogliano M, Capener D, Tubman E, Elliot CA, Charalampopoulos A, Sabroe I, Thompson AAR, Billings CG, Hamilton N, Baster K, Laud PJ, Hickey PM, Middleton J, Armstrong IJ, Hurdman JA, Lawrie A, Rothman AMK, Wild JM, Condliffe R, Swift AJ, Kiely DG. Identification of Cardiac Magnetic Resonance Imaging Thresholds for Risk Stratification in Pulmonary Arterial Hypertension. Am J Respir Crit Care Med 2020; 201:458-468. [PMID: 31647310 PMCID: PMC7049935 DOI: 10.1164/rccm.201909-1771oc] [Citation(s) in RCA: 87] [Impact Index Per Article: 21.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023] Open
Abstract
Rationale: Pulmonary arterial hypertension (PAH) is a life-shortening condition. The European Society of Cardiology and European Respiratory Society and the REVEAL (North American Registry to Evaluate Early and Long-Term PAH Disease Management) risk score calculator (REVEAL 2.0) identify thresholds to predict 1-year mortality. Objectives: This study evaluates whether cardiac magnetic resonance imaging (MRI) thresholds can be identified and used to aid risk stratification and facilitate decision-making. Methods: Consecutive patients with PAH (n = 438) undergoing cardiac MRI were identified from the ASPIRE (Assessing the Spectrum of Pulmonary Hypertension Identified at a Referral Center) MRI database. Thresholds were identified from a discovery cohort and evaluated in a test cohort. Measurements and Main Results: A percentage-predicted right ventricular end-systolic volume index threshold of 227% or a left ventricular end-diastolic volume index of 58 ml/m2 identified patients at low (<5%) and high (>10%) risk of 1-year mortality. These metrics respectively identified 63% and 34% of patients as low risk. Right ventricular ejection fraction >54%, 37–54%, and <37% identified 21%, 43%, and 36% of patients at low, intermediate, and high risk, respectively, of 1-year mortality. At follow-up cardiac MRI, patients who improved to or were maintained in a low-risk group had a 1-year mortality <5%. Percentage-predicted right ventricular end-systolic volume index independently predicted outcome and, when used in conjunction with the REVEAL 2.0 risk score calculator or a modified French Pulmonary Hypertension Registry approach, improved risk stratification for 1-year mortality. Conclusions: Cardiac MRI can be used to risk stratify patients with PAH using a threshold approach. Percentage-predicted right ventricular end-systolic volume index can identify a high percentage of patients at low-risk of 1-year mortality and, when used in conjunction with current risk stratification approaches, can improve risk stratification. This study supports further evaluation of cardiac MRI in risk stratification in PAH.
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Affiliation(s)
- Robert A Lewis
- Sheffield Pulmonary Vascular Disease Unit, Sheffield Teaching Hospitals NHS Foundation Trust, Royal Hallamshire Hospital, Sheffield, United Kingdom.,Department of Infection, Immunity and Cardiovascular Disease, University of Sheffield Medical School, Sheffield, United Kingdom; and
| | - Christopher S Johns
- Department of Infection, Immunity and Cardiovascular Disease, University of Sheffield Medical School, Sheffield, United Kingdom; and
| | - Marcella Cogliano
- Department of Infection, Immunity and Cardiovascular Disease, University of Sheffield Medical School, Sheffield, United Kingdom; and
| | - David Capener
- Department of Infection, Immunity and Cardiovascular Disease, University of Sheffield Medical School, Sheffield, United Kingdom; and
| | - Euan Tubman
- Department of Infection, Immunity and Cardiovascular Disease, University of Sheffield Medical School, Sheffield, United Kingdom; and
| | - Charlie A Elliot
- Sheffield Pulmonary Vascular Disease Unit, Sheffield Teaching Hospitals NHS Foundation Trust, Royal Hallamshire Hospital, Sheffield, United Kingdom
| | - Athanasios Charalampopoulos
- Sheffield Pulmonary Vascular Disease Unit, Sheffield Teaching Hospitals NHS Foundation Trust, Royal Hallamshire Hospital, Sheffield, United Kingdom
| | - Ian Sabroe
- Sheffield Pulmonary Vascular Disease Unit, Sheffield Teaching Hospitals NHS Foundation Trust, Royal Hallamshire Hospital, Sheffield, United Kingdom.,Department of Infection, Immunity and Cardiovascular Disease, University of Sheffield Medical School, Sheffield, United Kingdom; and
| | - A A Roger Thompson
- Sheffield Pulmonary Vascular Disease Unit, Sheffield Teaching Hospitals NHS Foundation Trust, Royal Hallamshire Hospital, Sheffield, United Kingdom.,Department of Infection, Immunity and Cardiovascular Disease, University of Sheffield Medical School, Sheffield, United Kingdom; and
| | - Catherine G Billings
- Sheffield Pulmonary Vascular Disease Unit, Sheffield Teaching Hospitals NHS Foundation Trust, Royal Hallamshire Hospital, Sheffield, United Kingdom.,Department of Infection, Immunity and Cardiovascular Disease, University of Sheffield Medical School, Sheffield, United Kingdom; and
| | - Neil Hamilton
- Sheffield Pulmonary Vascular Disease Unit, Sheffield Teaching Hospitals NHS Foundation Trust, Royal Hallamshire Hospital, Sheffield, United Kingdom
| | - Kathleen Baster
- Statistical Services Unit, School of Mathematics and Statistics and
| | - Peter J Laud
- Statistical Services Unit, School of Mathematics and Statistics and
| | - Peter M Hickey
- Sheffield Pulmonary Vascular Disease Unit, Sheffield Teaching Hospitals NHS Foundation Trust, Royal Hallamshire Hospital, Sheffield, United Kingdom.,Department of Infection, Immunity and Cardiovascular Disease, University of Sheffield Medical School, Sheffield, United Kingdom; and
| | - Jennifer Middleton
- Sheffield Pulmonary Vascular Disease Unit, Sheffield Teaching Hospitals NHS Foundation Trust, Royal Hallamshire Hospital, Sheffield, United Kingdom.,Department of Infection, Immunity and Cardiovascular Disease, University of Sheffield Medical School, Sheffield, United Kingdom; and
| | - Iain J Armstrong
- Sheffield Pulmonary Vascular Disease Unit, Sheffield Teaching Hospitals NHS Foundation Trust, Royal Hallamshire Hospital, Sheffield, United Kingdom
| | - Judith A Hurdman
- Sheffield Pulmonary Vascular Disease Unit, Sheffield Teaching Hospitals NHS Foundation Trust, Royal Hallamshire Hospital, Sheffield, United Kingdom
| | - Allan Lawrie
- Department of Infection, Immunity and Cardiovascular Disease, University of Sheffield Medical School, Sheffield, United Kingdom; and
| | - Alexander M K Rothman
- Sheffield Pulmonary Vascular Disease Unit, Sheffield Teaching Hospitals NHS Foundation Trust, Royal Hallamshire Hospital, Sheffield, United Kingdom.,Department of Infection, Immunity and Cardiovascular Disease, University of Sheffield Medical School, Sheffield, United Kingdom; and.,Insigneo Institute for In Silico Medicine, University of Sheffield, Sheffield, United Kingdom
| | - Jim M Wild
- Department of Infection, Immunity and Cardiovascular Disease, University of Sheffield Medical School, Sheffield, United Kingdom; and
| | - Robin Condliffe
- Sheffield Pulmonary Vascular Disease Unit, Sheffield Teaching Hospitals NHS Foundation Trust, Royal Hallamshire Hospital, Sheffield, United Kingdom
| | - Andrew J Swift
- Department of Infection, Immunity and Cardiovascular Disease, University of Sheffield Medical School, Sheffield, United Kingdom; and.,Insigneo Institute for In Silico Medicine, University of Sheffield, Sheffield, United Kingdom
| | - David G Kiely
- Sheffield Pulmonary Vascular Disease Unit, Sheffield Teaching Hospitals NHS Foundation Trust, Royal Hallamshire Hospital, Sheffield, United Kingdom.,Department of Infection, Immunity and Cardiovascular Disease, University of Sheffield Medical School, Sheffield, United Kingdom; and.,Insigneo Institute for In Silico Medicine, University of Sheffield, Sheffield, United Kingdom
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24
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Lewis RA, Billings CG, Bolger A, Bowater S, Charalampopoulos A, Clift P, Elliot CA, English K, Hamilton N, Hill C, Hurdman J, Jenkins PJ, Johns C, MacDonald S, Oliver J, Papaioannou V, Rajaram S, Sabroe I, Swift AJ, Thompson AAR, Kiely DG, Condliffe R. Partial anomalous pulmonary venous drainage in patients presenting with suspected pulmonary hypertension: A series of 90 patients from the ASPIRE registry. Respirology 2020; 25:1066-1072. [PMID: 32249494 PMCID: PMC8653892 DOI: 10.1111/resp.13815] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2019] [Revised: 03/16/2020] [Accepted: 03/17/2020] [Indexed: 11/30/2022]
Abstract
Background and objective There are limited data regarding patients with PAPVD with suspected and diagnosed PH. Methods Patients with PAPVD presenting to a large PH referral centre during 2007–2017 were identified from the ASPIRE registry. Results Ninety patients with PAPVD were identified; this was newly diagnosed at our unit in 71 patients (78%), despite 69% of these having previously undergone CT. Sixty‐seven percent had a single right superior and 23% a single left superior anomalous vein. Patients with an SV‐ASD had a significantly larger RV area, pulmonary artery and L‐R shunt and a higher % predicted DLCO (all P < 0.05). Sixty‐five patients were diagnosed with PH (defined as mPAP ≥ 25 mm Hg), which was post‐capillary in 24 (37%). No additional causes of PH were identified in 28 patients; 17 of these (26% of those patients with PH) had a PVR > 3 WU. Seven of these patients had isolated PAPVD, five of whom (8% of those patients with PH) had anomalous drainage of a single pulmonary vein. Conclusion Undiagnosed PAPVD with or without ASD may be present in patients with suspected PH; cross‐sectional imaging should therefore be specifically assessed whenever this diagnosis is considered. Radiological and physiological markers of L‐R shunt are higher in patients with an associated SV‐ASD. Although many patients with PAPVD and PH may have other potential causes of PH, a proportion of patients diagnosed with PAH have isolated PAPVD in the absence of other causative conditions. PAPVD was frequently missed in patients presenting with suspected PH. L‐R shunt was higher in patients with associated ASD. Although patients may have other potential causes of PH, some patients with PAH have isolated PAPVD without other causative conditions. See relatedEditorial
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Affiliation(s)
- Robert A Lewis
- Sheffield Pulmonary Vascular Disease Unit, Royal Hallamshire Hospital, Sheffield, UK.,Department of Infection, Immunity and Cardiovascular Disease, University of Sheffield, Sheffield, UK
| | - Catherine G Billings
- Sheffield Pulmonary Vascular Disease Unit, Royal Hallamshire Hospital, Sheffield, UK
| | - Aidan Bolger
- Department of Adult Congenital Cardiology, Glenfield Hospital, Leicester, UK
| | - Sarah Bowater
- Department of Adult Congenital Cardiology, Queen Elizabeth Hospital, Birmingham, UK
| | | | - Paul Clift
- Department of Adult Congenital Cardiology, Queen Elizabeth Hospital, Birmingham, UK
| | - Charlie A Elliot
- Sheffield Pulmonary Vascular Disease Unit, Royal Hallamshire Hospital, Sheffield, UK
| | - Kate English
- Department of Adult Congenital Cardiology, Leeds General Infirmary, Leeds, UK
| | - Neil Hamilton
- Sheffield Pulmonary Vascular Disease Unit, Royal Hallamshire Hospital, Sheffield, UK
| | - Catherine Hill
- Department of Academic Radiology, University of Sheffield, Sheffield, UK
| | - Judith Hurdman
- Sheffield Pulmonary Vascular Disease Unit, Royal Hallamshire Hospital, Sheffield, UK
| | - Petra J Jenkins
- Department of Adult Congenital Cardiology, Manchester Royal Infirmary, Manchester, UK
| | - Christopher Johns
- Department of Academic Radiology, University of Sheffield, Sheffield, UK
| | - Simon MacDonald
- Department of Adult Congenital Cardiology, Glenfield Hospital, Leicester, UK
| | - James Oliver
- Department of Adult Congenital Cardiology, Leeds General Infirmary, Leeds, UK
| | - Vasilios Papaioannou
- Department of Adult Congenital Cardiology, Manchester Royal Infirmary, Manchester, UK
| | - Smitha Rajaram
- Department of Academic Radiology, University of Sheffield, Sheffield, UK
| | - Ian Sabroe
- Sheffield Pulmonary Vascular Disease Unit, Royal Hallamshire Hospital, Sheffield, UK.,Department of Infection, Immunity and Cardiovascular Disease, University of Sheffield, Sheffield, UK
| | - Andy J Swift
- Department of Academic Radiology, University of Sheffield, Sheffield, UK.,Department of Infection, Immunity and Cardiovascular Disease, University of Sheffield, Sheffield, UK
| | - A A Roger Thompson
- Sheffield Pulmonary Vascular Disease Unit, Royal Hallamshire Hospital, Sheffield, UK.,Department of Infection, Immunity and Cardiovascular Disease, University of Sheffield, Sheffield, UK
| | - David G Kiely
- Sheffield Pulmonary Vascular Disease Unit, Royal Hallamshire Hospital, Sheffield, UK.,Department of Infection, Immunity and Cardiovascular Disease, University of Sheffield, Sheffield, UK
| | - Robin Condliffe
- Sheffield Pulmonary Vascular Disease Unit, Royal Hallamshire Hospital, Sheffield, UK.,Department of Infection, Immunity and Cardiovascular Disease, University of Sheffield, Sheffield, UK
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25
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Lepodise LM, Horvat J, Lewis RA. Superficial and Fundamental Correspondences in the Terahertz/IR (6-15 THz) Absorption Spectra of Aspirin and Benzoic Acid. J Phys Chem A 2018; 122:6886-6893. [PMID: 30060668 DOI: 10.1021/acs.jpca.8b05393] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The terahertz absorption spectra of aspirin and benzoic acid have been measured in the range 200-500 cm-1 (6-15 THz). Density-functional theory (DFT) modeling has assigned fundamental vibrational modes to the observed absorption bands. Hydrogen bonds between the crystalline planes of aspirin resulted in better agreement between the experimental and modeled spectra than for benzoic acid. The similar structure of these two molecules suggests a similar absorption spectrum, which indeed was obtained experimentally. However, the detailed crystal structure and molecular differences result in some of the apparently common absorption bands being assigned to different vibrational modes through the DFT modeling. Thus, our study importantly reveals that even though crystalline forms of two similar molecules may have similar experimental terahertz spectra, the resemblance may be superficial rather than fundamental.
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Affiliation(s)
- L M Lepodise
- Botswana International University of Science and Technology , Palapye , Botswana.,School of Physics and Institute for Superconducting and Electronic Materials , University of Wollongong , Wollongong , NSW 2522 , Australia
| | - J Horvat
- School of Physics and Institute for Superconducting and Electronic Materials , University of Wollongong , Wollongong , NSW 2522 , Australia
| | - R A Lewis
- School of Physics and Institute for Superconducting and Electronic Materials , University of Wollongong , Wollongong , NSW 2522 , Australia
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26
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McGillick EV, Lee K, Yamaoka S, te Pas AB, Crossley KJ, Wallace MJ, Kitchen MJ, Lewis RA, Kerr LT, DeKoninck P, Dekker J, Thio M, McDougall AR, Hooper SB. Elevated airway liquid volumes at birth: a potential cause of transient tachypnea of the newborn. J Appl Physiol (1985) 2017; 123:1204-1213. [DOI: 10.1152/japplphysiol.00464.2017] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2017] [Revised: 07/28/2017] [Accepted: 07/28/2017] [Indexed: 11/22/2022] Open
Abstract
Excessive liquid in airways and/or distal lung tissue may underpin the respiratory morbidity associated with transient tachypnea of the newborn (TTN). However, its effects on lung aeration and respiratory function following birth are unknown. We investigated the effect of elevated airway liquid volumes on newborn respiratory function. Near-term rabbit kittens (30 days gestation; term ~32 days) were delivered, had their lung liquid-drained, and either had no liquid replaced (control; n = 7) or 30 ml/kg of liquid re-added to the airways [liquid added (LA); n = 7]. Kittens were mechanically ventilated in a plethysmograph. Measures of chest and lung parameters, uniformity of lung aeration, and airway size were analyzed using phase contrast X-ray imaging. The maximum peak inflation pressure required to recruit a tidal volume of 8 ml/kg was significantly greater in LA compared with control kittens (35.0 ± 0.7 vs. 26.8 ± 0.4 cmH2O, P < 0.001). LA kittens required greater time to achieve lung aeration (106 ± 14 vs. 60 ± 6 inflations, P = 0.03) and had expanded chest walls, as evidenced by an increased total chest area (32 ± 9%, P < 0.0001), lung height (17 ± 6%, P = 0.02), and curvature of the diaphragm (19 ± 8%, P = 0.04). LA kittens had lower functional residual capacity during stepwise changes in positive end-expiratory pressures (5, 3, 0, and 5 cmH20). Elevated lung liquid volumes had marked adverse effects on lung structure and function in the immediate neonatal period and reduced the ability of the lung to aerate efficiently. We speculate that elevated airway liquid volumes may underlie the initial morbidity in near-term babies with TTN after birth. NEW & NOTEWORTHY Transient tachypnea of the newborn reduces respiratory function in newborns and is thought to result due to elevated airway liquid volumes following birth. However, the effect of elevated airway liquid volumes on neonatal respiratory function is unknown. Using phase contrast X-ray imaging, we show that elevated airway liquid volumes have adverse effects on lung structure and function in the immediate newborn period, which may underlie the pathology of TTN in near-term babies after birth.
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Affiliation(s)
- Erin V. McGillick
- The Ritchie Centre, Hudson Institute of Medical Research, Melbourne, Victoria, Australia
- Department of Obstetrics and Gynaecology Monash University, Melbourne, Victoria, Australia
| | - Katie Lee
- School of Physics and Astronomy, Monash University, Melbourne, Victoria, Australia
| | - Shigeo Yamaoka
- The Ritchie Centre, Hudson Institute of Medical Research, Melbourne, Victoria, Australia
- Department of Obstetrics and Gynaecology Monash University, Melbourne, Victoria, Australia
| | - Arjan B. te Pas
- Division of Neonatology, Department of Pediatrics, Leiden University Medical Center, Leiden, The Netherlands
| | - Kelly J. Crossley
- The Ritchie Centre, Hudson Institute of Medical Research, Melbourne, Victoria, Australia
- Department of Obstetrics and Gynaecology Monash University, Melbourne, Victoria, Australia
| | - Megan J. Wallace
- The Ritchie Centre, Hudson Institute of Medical Research, Melbourne, Victoria, Australia
- Department of Obstetrics and Gynaecology Monash University, Melbourne, Victoria, Australia
| | - Marcus J. Kitchen
- School of Physics and Astronomy, Monash University, Melbourne, Victoria, Australia
| | - Robert A. Lewis
- Department of Medical Imaging and Radiation Sciences, Monash University, Melbourne, Victoria, Australia
- Department of Medical Imaging, University of Saskatchewan, Saskatoon, Saskatchewan, Canada
| | - Lauren T. Kerr
- The Ritchie Centre, Hudson Institute of Medical Research, Melbourne, Victoria, Australia
- Department of Obstetrics and Gynaecology Monash University, Melbourne, Victoria, Australia
| | - Philip DeKoninck
- The Ritchie Centre, Hudson Institute of Medical Research, Melbourne, Victoria, Australia
- Department of Obstetrics and Gynaecology Monash University, Melbourne, Victoria, Australia
| | - Janneke Dekker
- Division of Neonatology, Department of Pediatrics, Leiden University Medical Center, Leiden, The Netherlands
| | - Marta Thio
- Women’s Newborn Research Centre, The Royal Women’s Hospital, Melbourne, Victoria, Australia
- Murdoch Children’s Research Institute, Melbourne, Australia; and
- Department of Obstetrics and Gynaecology, University of Melbourne, Melbourne, Australia
| | - Annie R.A. McDougall
- The Ritchie Centre, Hudson Institute of Medical Research, Melbourne, Victoria, Australia
- Department of Obstetrics and Gynaecology Monash University, Melbourne, Victoria, Australia
| | - Stuart B. Hooper
- The Ritchie Centre, Hudson Institute of Medical Research, Melbourne, Victoria, Australia
- Department of Obstetrics and Gynaecology Monash University, Melbourne, Victoria, Australia
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Geiger DK, DeStefano MR, Lewis RA. Structural characterization of two solvates of a luminescent copper(II) bis-(pyridine)-substituted benzimidazole complex. Acta Crystallogr E Crystallogr Commun 2017; 73:1616-1621. [PMID: 29152336 PMCID: PMC5683476 DOI: 10.1107/s2056989017014232] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/29/2017] [Accepted: 10/02/2017] [Indexed: 11/11/2022]
Abstract
Copper(II) complexes of benzimidazole are known to exhibit biological activity that makes them of inter-est for chemotherapeutic and other pharmaceutical uses. The complex bis-(acetato-κO){5,6-dimethyl-2-(pyridin-2-yl)-1-[(pyridin-2-yl)meth-yl]-1H-benzimidazole-κ2N2,N3}copper(II), has been prepared. The absorption spectrum has features attributed to intra-ligand and ligand-field transitions and the complex exhibits ligand-centered room-temperature luminescence in solution. The aceto-nitrile monosolvate, [Cu(C2H3O2)2(C20H18N4)]·C2H3N (1), and the ethanol hemisolvate, [Cu(C2H3O2)2(C20H18N4)]·0.5C2H6O (2), have been structurally characterized. Compound 2 has two copper(II) complexes in the asymmetric unit. In both 1 and 2, distorted square-planar N2O2 coordination geometries are observed and the Cu-N(Im) bond distance is slightly shorter than the Cu-N(py) bond distance. Inter-molecular π-π inter-actions are found in 1 and 2. A weak C-H⋯π inter-action is observed in 1.
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Affiliation(s)
- David K Geiger
- Department of Chemistry, SUNY-College at Geneseo, Geneseo, NY 14454, USA
| | | | - Robert A Lewis
- Department of Chemistry, SUNY-College at Geneseo, Geneseo, NY 14454, USA
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28
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Lang JAR, Pearson JT, Binder-Heschl C, Wallace MJ, Siew ML, Kitchen MJ, Te Pas AB, Lewis RA, Polglase GR, Shirai M, Hooper SB. Vagal denervation inhibits the increase in pulmonary blood flow during partial lung aeration at birth. J Physiol 2017; 595:1593-1606. [PMID: 27902842 DOI: 10.1113/jp273682] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2016] [Accepted: 11/15/2016] [Indexed: 11/08/2022] Open
Abstract
KEY POINTS Lung aeration at birth significantly increases pulmonary blood flow, which is unrelated to increased oxygenation or other spatial relationships that match ventilation to perfusion. Using simultaneous X-ray imaging and angiography in near-term rabbits, we investigated the relative contributions of the vagus nerve and oxygenation to the increase in pulmonary blood flow at birth. Vagal denervation inhibited the global increase in pulmonary blood flow induced by partial lung aeration, although high inspired oxygen concentrations can partially mitigate this effect. The results of the present study indicate that a vagal reflex may mediate a rapid global increase in pulmonary blood flow in response to partial lung aeration. ABSTRACT Air entry into the lungs at birth triggers major cardiovascular changes, including a large increase in pulmonary blood flow (PBF) that is not spatially related to regional lung aeration. To investigate the possible underlying role of a vagally-mediated stimulus, we used simultaneous phase-contrast X-ray imaging and angiography in near-term (30 days of gestation) vagotomized (n = 15) or sham-operated (n = 15) rabbit kittens. Rabbits were imaged before ventilation, when one lung was ventilated (unilateral) with 100% nitrogen (N2 ), air or 100% oxygen (O2 ), and after all kittens were switched to unilateral ventilation in air and then ventilation of both lungs using air. Compared to control kittens, vagotomized kittens had little or no increase in PBF in both lungs following unilateral ventilation when ventilation occurred with 100% N2 or with air. However, relative PBF did increase in vagotomized animals ventilated with 100% O2 , indicating the independent stimulatory effects of local oxygen concentration and autonomic innervation on the changes in PBF at birth. These findings demonstrate that vagal denervation inhibits the previously observed increase in PBF with partial lung aeration, although high inspired oxygen concentrations can partially mitigate this effect.
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Affiliation(s)
- Justin A R Lang
- The Ritchie Centre, Hudson Institute of Medical Research, Melbourne, Australia.,Department of Obstetrics and Gynaecology, Monash University, Melbourne, Australia
| | - James T Pearson
- Monash Biomedical Imaging Facility and Department of Physiology, Monash University, Melbourne, Australia.,Australian Synchrotron, Melbourne, Australia.,Department of Cardiac Physiology, National Cerebral and Cardiovascular Centre Research Institute, Osaka, Japan
| | - Corinna Binder-Heschl
- The Ritchie Centre, Hudson Institute of Medical Research, Melbourne, Australia.,Department of Obstetrics and Gynaecology, Monash University, Melbourne, Australia.,Medical University of Graz, Austria
| | - Megan J Wallace
- The Ritchie Centre, Hudson Institute of Medical Research, Melbourne, Australia.,Department of Obstetrics and Gynaecology, Monash University, Melbourne, Australia
| | - Melissa L Siew
- The Ritchie Centre, Hudson Institute of Medical Research, Melbourne, Australia.,Department of Obstetrics and Gynaecology, Monash University, Melbourne, Australia
| | - Marcus J Kitchen
- School of Physics and Astronomy, Monash University, Melbourne, Australia
| | - Arjan B Te Pas
- Department of Pediatrics, Leiden University Medical Centre, Leiden, Netherlands
| | - Robert A Lewis
- Medical Imaging and Radiation Sciences, Monash University, Melbourne, Australia.,Department of Medical Imaging, University of Saskatchewan, Saskatoon, Canada
| | - Graeme R Polglase
- The Ritchie Centre, Hudson Institute of Medical Research, Melbourne, Australia.,Department of Obstetrics and Gynaecology, Monash University, Melbourne, Australia
| | - Mikiyasu Shirai
- Department of Cardiac Physiology, National Cerebral and Cardiovascular Centre Research Institute, Osaka, Japan
| | - Stuart B Hooper
- The Ritchie Centre, Hudson Institute of Medical Research, Melbourne, Australia.,Department of Obstetrics and Gynaecology, Monash University, Melbourne, Australia
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Abstract
This article describes the efficacy of two family-oriented, outpatient drug interventions for 84 adolescents who had used and abused drugs. Together, the two brief drug interventions appeared to significantly reduce the drug use of nearly one-half of the adolescentts who received the two family-focused drug interventions. It is surmised that this slccess was due partly to the fact that both outpatient interventions focus on the sxystemic treatment of entire familv groups rather than being given to the adolescents as inidiv iduals. WVheti comnpared, however the family therapy intervention appears to have been effectiv e itn reducing drug use for a greater percentage of the adolescents than did the familv education intervention.
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30
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Crawshaw JR, Hooper SB, Te Pas AB, Allison BA, Wallace MJ, Kerr LT, Lewis RA, Morley CJ, Leong AF, Kitchen MJ. Effect of betamethasone, surfactant, and positive end-expiratory pressures on lung aeration at birth in preterm rabbits. J Appl Physiol (1985) 2016; 121:750-759. [PMID: 27402562 DOI: 10.1152/japplphysiol.01043.2015] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2015] [Accepted: 06/30/2016] [Indexed: 11/22/2022] Open
Abstract
Antenatal glucocorticoids, exogenous surfactant, and positive end-expiratory pressure (PEEP) ventilation are commonly provided to preterm infants to enhance respiratory function after birth. It is unclear how these treatments interact to improve the transition to air-breathing at birth. We investigated the relative contribution of antenatal betamethasone, prophylactic surfactant, and PEEP (3 cmH2O) on functional residual capacity (FRC) and dynamic lung compliance (CDL) in preterm (28 day GA) rabbit kittens at birth. Kittens were delivered by cesarean section and mechanically ventilated. FRC was calculated from X-ray images, and CDL was measured using plethysmography. Without betamethasone, PEEP increased FRC recruitment and CDL Surfactant did not further increase FRC, but significantly increased CDL Betamethasone abolished the benefit of PEEP on FRC, but surfactant counteracted this effect of betamethasone. These findings indicate that low PEEP levels are insufficient to establish FRC at birth following betamethasone treatment. However, surfactant reversed the effect of betamethasone and when combined, these two treatments enhanced FRC recruitment irrespective of PEEP level.
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Affiliation(s)
- Jessica R Crawshaw
- The Ritchie Centre, Hudson Institute for Medical Research, Melbourne, Australia; Department of Obstetrics and Gynaecology, Monash University, Clayton, Victoria, Australia
| | - Stuart B Hooper
- The Ritchie Centre, Hudson Institute for Medical Research, Melbourne, Australia; Department of Obstetrics and Gynaecology, Monash University, Clayton, Victoria, Australia;
| | - Arjan B Te Pas
- Division of Neonatology, Department of Pediatrics, Leiden University Medical Center, Leiden, the Netherlands
| | - Beth A Allison
- The Ritchie Centre, Hudson Institute for Medical Research, Melbourne, Australia; Department of Obstetrics and Gynaecology, Monash University, Clayton, Victoria, Australia
| | - Megan J Wallace
- The Ritchie Centre, Hudson Institute for Medical Research, Melbourne, Australia; Department of Obstetrics and Gynaecology, Monash University, Clayton, Victoria, Australia
| | - Lauren T Kerr
- The Ritchie Centre, Hudson Institute for Medical Research, Melbourne, Australia; Department of Obstetrics and Gynaecology, Monash University, Clayton, Victoria, Australia
| | - Robert A Lewis
- Medical Imaging and Radiation Sciences, Monash University, Melbourne, Australia; Department of Medical Imaging, University of Saskatchewan, Saskatoon, Canada; and
| | | | - Andrew F Leong
- School of Physics and Astronomy, Monash University, Melbourne, Victoria, Australia
| | - Marcus J Kitchen
- School of Physics and Astronomy, Monash University, Melbourne, Victoria, Australia
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31
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Steele JA, Horvat J, Lewis RA, Henini M, Fan D, Mazur YI, Dorogan VG, Grant PC, Yu SQ, Salamo GJ. Mechanism of periodic height variations along self-aligned VLS-grown planar nanostructures. Nanoscale 2015; 7:20442-20450. [PMID: 26584058 DOI: 10.1039/c5nr06676j] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
In this study we report in-plane nanotracks produced by molecular-beam-epitaxy (MBE) exhibiting lateral self-assembly and unusual periodic and out-of-phase height variations across their growth axes. The nanotracks are synthesized using bismuth segregation on the GaAsBi epitaxial surface, which results in metallic liquid droplets capable of catalyzing GaAsBi nanotrack growth via the vapor-liquid-solid (VLS) mechanism. A detailed examination of the nanotrack morphologies is carried out employing a combination of scanning electron and atomic force microscopy and, based on the findings, a geometric model of nanotrack growth during MBE is developed. Our results indicate diffusion and shadowing effects play significant roles in defining the interesting nanotrack shape. The unique periodicity of our lateral nanotracks originates from a rotating nucleation "hot spot" at the edge of the liquid-solid interface, a feature caused by the relative periodic circling of the non-normal ion beam flux incident on the sample surface, inside the MBE chamber. We point out that such a concept is divergent from current models of crawling mode growth kinetics and conclude that these effects may be utilized in the design and assembly of planar nanostructures with controlled non-monotonous structure.
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Affiliation(s)
- J A Steele
- Institute for Superconducting and Electronic Materials and School of Physics, University of Wollongong, Wollongong, New South Wales 2522, Australia..
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Lang JAR, Pearson JT, Binder-Heschl C, Wallace MJ, Siew ML, Kitchen MJ, te Pas AB, Fouras A, Lewis RA, Polglase GR, Shirai M, Hooper SB. Increase in pulmonary blood flow at birth: role of oxygen and lung aeration. J Physiol 2015; 594:1389-98. [PMID: 26278276 DOI: 10.1113/jp270926] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2015] [Accepted: 08/04/2015] [Indexed: 11/08/2022] Open
Abstract
Lung aeration stimulates the increase in pulmonary blood flow (PBF) at birth, but the spatial relationships between PBF and lung aeration and the role of increased oxygenation remain unclear. Using simultaneous phase-contrast X-ray imaging and angiography, we have investigated the separate roles of lung aeration and increased oxygenation in PBF changes at birth using near-term (30 days of gestation) rabbit kits (n = 18). Rabbits were imaged before ventilation, then the right lung was ventilated with 100% nitrogen (N2), air or 100% O2 (oxygen), before all kits were switched to ventilation in air, followed by ventilation of both lungs using air. Unilateral ventilation of the right lung with 100% N2 significantly increased heart rate (from 69.4 ± 4.9 to 93.0 ± 15.0 bpm), the diameters of both left and right pulmonary axial arteries, number of visible vessels in both left and right lungs, relative PBF index in both pulmonary arteries, and reduced bolus transit time for both left and right axial arteries (from 1.34 ± 0.39 and 1.81 ± 0.43 s to 0.52 ± 0.17 and 0.89 ± 0.21 s in the left and right axial arteries, respectively). Similar changes were observed with 100% oxygen, but increases in visible vessel number and vessel diameter of the axial arteries were greater in the ventilated right lung during unilateral ventilation. These findings confirm that PBF increase at birth is not spatially related to lung aeration and that the increase in PBF to unventilated regions is unrelated to oxygenation, although oxygen can potentiate this increase.
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Affiliation(s)
- Justin A R Lang
- The Ritchie Centre, Hudson Institute of Medical Research, Melbourne, Australia.,Department of Obstetrics and Gynaecology, Monash University, Melbourne, Australia
| | - James T Pearson
- Monash Biomedical Imaging Facility and Department of Physiology, Monash University, Melbourne, Australia.,Australian Synchrotron, Melbourne, Australia
| | - Corinna Binder-Heschl
- The Ritchie Centre, Hudson Institute of Medical Research, Melbourne, Australia.,Department of Obstetrics and Gynaecology, Monash University, Melbourne, Australia.,Medical University of Graz, Austria
| | - Megan J Wallace
- The Ritchie Centre, Hudson Institute of Medical Research, Melbourne, Australia.,Department of Obstetrics and Gynaecology, Monash University, Melbourne, Australia
| | - Melissa L Siew
- The Ritchie Centre, Hudson Institute of Medical Research, Melbourne, Australia.,Department of Obstetrics and Gynaecology, Monash University, Melbourne, Australia
| | - Marcus J Kitchen
- School of Physics and Astronomy, Monash University, Melbourne, Australia
| | - Arjan B te Pas
- Department of Pediatrics, Leiden University Medical Centre, Leiden, Netherlands
| | - Andreas Fouras
- Department of Mechanical and Aerospace Engineering, Monash University, Melbourne, Australia
| | - Robert A Lewis
- Medical Imaging and Radiation Sciences, Monash University, Melbourne, Australia.,Department of Medical Imaging, University of Saskatchewan, Saskatoon, Canada
| | - Graeme R Polglase
- The Ritchie Centre, Hudson Institute of Medical Research, Melbourne, Australia.,Department of Obstetrics and Gynaecology, Monash University, Melbourne, Australia
| | - Mikiyasu Shirai
- Department of Cardiac Physiology, National Cerebral and Cardiovascular Center Research Institute, Osaka, Japan
| | - Stuart B Hooper
- The Ritchie Centre, Hudson Institute of Medical Research, Melbourne, Australia.,Department of Obstetrics and Gynaecology, Monash University, Melbourne, Australia
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33
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Lepodise LM, Horvat J, Lewis RA. Terahertz (6-15 THz) Spectroscopy and Numerical Modeling of Intermolecular Vibrations in Benzoic Acid and Its Derivatives. Appl Spectrosc 2015; 69:590-596. [PMID: 25909770 DOI: 10.1366/14-07658] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Terahertz spectroscopy of benzoic acid (BA) and two of its derivatives, 2-hydroxybenzoic acid (2OH-BA) and 3-hydroxybenzoic acid (3OH-BA), has been investigated in the spectral region 200 to 500 cm(-1) (6.06 to 15.15 THz). The spectra show distinct absorption features. There is agreement between some of the absorption lines observed for these compounds, despite a shift in energy, which is attributed to the differences in the molecular structures. Numerical modeling gave corresponding absorption lines, and this helped in the assignment. Temperature dependence studies revealed that most of the absorption lines are composite lines in this frequency region.
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Affiliation(s)
- Lucia M Lepodise
- School of Physics and Institute for Superconducting and Electronic Materials, University of Wollongong, NSW 2522, Australia
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34
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Abstract
Previous THz spectroscopy of the TNT explosive precursor, 2,4-dinitrotoluene (DNT), has been restricted to room temperature (apart from one set of data at 11 K). Here, for the first time, we investigate the spectrum as the temperature is systematically varied, from 7 to 245 K. Many new features appear in the spectrum on cooling below room temperature. As well as the five absorption lines observed previously, we observe five additional lines. In addition, a new room-temperature line at 8.52 THz (281 cm(-1)) is observed. Six of the lines red-shift with temperature and four of them blue-shift. The blue shift is explained by interplay between intramolecular and intermolecular hydrogen bonds. The variation in line width and line intensity with temperature is not systematic, although a conspicuous decrease in line intensity with temperature is observed in all cases. Modeling with hybrid PBE0 and TPSSh functionals helps identify absorption modes.
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Affiliation(s)
- Lucia M Lepodise
- Institute for Superconducting and Electronic Materials and School of Physics, University of Wollongong , Wollongong, New South Wales 2522, Australia
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35
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Nobile-Orazio E, Lewis RA. 7th International Immunoglobulin Conference: Neurology. Clin Exp Immunol 2014; 178 Suppl 1:45. [PMID: 25546757 DOI: 10.1111/cei.12506] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
Abstract
Data presented demonstrate the versatility of immunoglobulin (Ig) therapy for a variety of neurological disorders with different pathogenesis and presentations. In indications where the efficacy of Ig is well established, the neurology community is striving to improve the use of this valuable and limited resource by perfecting best practice guidelines, individualizing dosing schemes and investigating combination therapies to enhance treatment benefit. The data showing the efficacy of Ig therapy in conditions such as chronic pain and autoimmune encephalitis are promising. Future challenges for Ig use in neurological disorders were also outlined. Ongoing and upcoming randomized controlled trials will be pivotal to the use of Ig in the future, by identifying responder groups and elucidating the most effective administration practices. As our understanding and use of the therapy increases, it is essential that we collect data on the effects of long-term Ig treatment in neurological conditions, of which very little currently exists.
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Affiliation(s)
- E Nobile-Orazio
- Humanitas Clinical and Research Center, Milan University, Milan, Italy
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36
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Steele JA, Lewis RA. Laser-induced oxidation kinetics of bismuth surface microdroplets on GaAsBi studied in situ by Raman microprobe analysis. Opt Express 2014; 22:32261-32275. [PMID: 25607191 DOI: 10.1364/oe.22.032261] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
We report the cw-laser-induced oxidation of molecular-beam-epitaxy grown GaAsBi bismuth surface microdroplets investigated in situ by micro-Raman spectroscopy under ambient conditions as a function of irradiation power and time. Our results reveal the surface droplets are high-purity crystalline bismuth and the resultant Bi2O3 transformation to be β-phase and stable at room temperature. A detailed Raman study of Bi microdroplet oxidation kinetics yields insights into the laser-induced oxidation process and offers useful real-time diagnostics. The temporal evolution of new β-Bi2O3 Raman modes is shown to be well described by Johnson-Mehl-Avrami-Kolmogorov kinetic transformation theory and while this study limits itself to the laser-induced oxidation of GaAsBi bismuth surface droplets, the results will find application within the wider context of bismuth laser-induced oxidation and direct Raman laser processing.
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37
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Abstract
Immunoglobulin (Ig) therapy has been used and studied as a treatment for a variety of neurological conditions for decades. In some of these disorders Ig therapy has a significant role as a first-line treatment. This session explores the use of Ig therapy in immune-mediated peripheral neuropathies and various central nervous system (CNS) diseases. Informative practice points relating to the management and treatment of these diseases are discussed. Potential future neurological indications for Ig therapy, as well as data on efficacy and possible mechanisms of action, are also presented. In peripheral immune-mediated neuropathies, data show good response rates to Ig therapy and it is often used as a first-line treatment. Intravenous immunoglobulin (IVIg) and subcutaneous immunoglobulin (SCIg) are both well tolerated, but dose and dosing frequency should be based on individual clinical responses. In Alzheimer's disease, although clinical data show no significant differences between IVIg and placebo, biomarker studies indicate that plasma-derived antibodies may be involved in clearance of amyloid aggregates from the brain. Data suggest that the use of high IVIg doses in early-stage Alzheimer's treatment may warrant further investigation. Ig therapy is considered a valuable option for autoimmune encephalitis, an antibody-mediated CNS disease. Combination treatment with IVIg and corticosteroids shows promising results and is proposed as a first-line treatment in these disorders. Until recently, very little was understood about the pathogenesis of chronic pain disorders. Data now indicate that perpetuation of the pain response may be underpinned by central immune activation. Some data suggest that Ig therapy may mitigate this effect, with good response rates in a number of studies, but these data need confirmation.
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Affiliation(s)
- E Nobile-Orazio
- Humanitas Clinical and Research Center, Milan UniversityRozzano, Milan, Italy
| | - R A Lewis
- Cedars-Sinai Medical CenterLos Angeles, CA, USA
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38
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Lang JAR, Pearson JT, te Pas AB, Wallace MJ, Siew ML, Kitchen MJ, Fouras A, Lewis RA, Wheeler KI, Polglase GR, Shirai M, Sonobe T, Hooper SB. Ventilation/perfusion mismatch during lung aeration at birth. J Appl Physiol (1985) 2014; 117:535-43. [PMID: 24994883 DOI: 10.1152/japplphysiol.01358.2013] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
At birth, the transition to newborn life is triggered by lung aeration, which stimulates a large increase in pulmonary blood flow (PBF). Current theories predict that the increase in PBF is spatially related to ventilated lung regions as they aerate after birth. Using simultaneous phase-contrast X-ray imaging and angiography we investigated the spatial relationships between lung aeration and the increase in PBF after birth. Six near-term (30-day gestation) rabbits were delivered by caesarean section, intubated and an intravenous catheter inserted, before they were positioned for X-ray imaging. During imaging, iodine was injected before ventilation onset, after ventilation of the right lung only, and after ventilation of both lungs. Unilateral ventilation increased iodine levels entering both left and right pulmonary arteries (PAs) and significantly increased heart rate, iodine ejection per beat, diameters of both left and right PAs, and number of visible vessels in both lungs. Within the 6th intercostal space, the mean gray level (relative measure of iodine level) increased from 68.3 ± 11.6 and 70.3 ± 7.5%·s to 136.3 ± 22.6 and 136.3 ± 23.7%·s in the left and right PAs, respectively. No differences were observed between vessels in the left and right lungs, despite the left lung not initially being ventilated. The increase in PBF at birth is not spatially related to lung aeration allowing a large ventilation/perfusion mismatch, or pulmonary shunting, to occur in the partially aerated lung at birth.
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Affiliation(s)
- Justin A R Lang
- The Ritchie Centre, MIMR-PHI Institute of Medical Research, Melbourne, Australia; Department of Obstetrics and Gynaecology, Monash University, Melbourne, Australia
| | - James T Pearson
- Monash Biomedical Imaging, Melbourne, Australia; Australian Synchrotron, Melbourne, Australia
| | - Arjan B te Pas
- Department of Pediatrics, Leiden University Medical Centre, Leiden, Netherlands
| | - Megan J Wallace
- The Ritchie Centre, MIMR-PHI Institute of Medical Research, Melbourne, Australia; Department of Obstetrics and Gynaecology, Monash University, Melbourne, Australia
| | - Melissa L Siew
- The Ritchie Centre, MIMR-PHI Institute of Medical Research, Melbourne, Australia; Department of Obstetrics and Gynaecology, Monash University, Melbourne, Australia
| | | | - Andreas Fouras
- Department of Mechanical and Aerospace Engineering, Monash University, Melbourne, Australia
| | - Robert A Lewis
- Medical Imaging and Radiation Sciences, Monash University, Melbourne, Australia; Department of Medical Imaging, University of Saskatchewan, Saskatoon, Canada
| | - Kevin I Wheeler
- The Ritchie Centre, MIMR-PHI Institute of Medical Research, Melbourne, Australia; Royal Hobart Hospital, Hobart, Australia; and
| | - Graeme R Polglase
- The Ritchie Centre, MIMR-PHI Institute of Medical Research, Melbourne, Australia; Department of Obstetrics and Gynaecology, Monash University, Melbourne, Australia
| | - Mikiyasu Shirai
- Department of Cardiac Physiology, National Cerebral and Cardiovascular Center Research Institute, Osaka, Japan
| | - Takashi Sonobe
- Department of Cardiac Physiology, National Cerebral and Cardiovascular Center Research Institute, Osaka, Japan
| | - Stuart B Hooper
- The Ritchie Centre, MIMR-PHI Institute of Medical Research, Melbourne, Australia; Department of Obstetrics and Gynaecology, Monash University, Melbourne, Australia;
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39
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Steele JA, Lewis RA, Henini M, Lemine OM, Fan D, Mazur YI, Dorogan VG, Grant PC, Yu SQ, Salamo GJ. Raman scattering reveals strong LO-phonon-hole-plasmon coupling in nominally undoped GaAsBi: optical determination of carrier concentration. Opt Express 2014; 22:11680-11689. [PMID: 24921290 DOI: 10.1364/oe.22.011680] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
We report room-temperature Raman scattering studies of nominally undoped (100) GaAs1−xBix epitaxial layers exhibiting Bi-induced (p-type) longitudinal-optical-plasmon-coupled (LOPC) modes for 0.018 ≤ x ≤ 0.048. Redshifts in the GaAs-like optical modes due to alloying are evaluated and are paralleled by strong damping of the LOPC. The relative integrated Raman intensities of LO(Γ) and LOPC ALO/ALOPC are characteristic of heavily doped p-GaAs, with a remarkable near total screening of the LO(Γ) phonon (ALO/ALOPC → 0) for larger Bi concentrations. A method of spectral analysis is set out which yields estimates of hole concentrations in excess of 5×1017cm−3 and correlates with the Bi molar fraction. These findings are in general agreement with recent electrical transport measurements performed on the alloy, and while the absolute size of the hole concentrations differ, likely origins for the discrepancy are discussed. We conclude that the damped LO-phonon-hole-plasmon coupling phenomena plays a dominant role in Raman scattering from unpassivated nominally undoped GaAsBi.
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Crosbie JC, Rogers PAW, Stevenson AW, Hall CJ, Lye JE, Nordström T, Midgley SM, Lewis RA. Reference dosimetry at the Australian Synchrotron's imaging and medical beamline using free-air ionization chamber measurements and theoretical predictions of air kerma rate and half value layer. Med Phys 2014; 40:062103. [PMID: 23718601 DOI: 10.1118/1.4803675] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
Abstract
PURPOSE Novel, preclinical radiotherapy modalities are being developed at synchrotrons around the world, most notably stereotactic synchrotron radiation therapy and microbeam radiotherapy at the European Synchrotron Radiation Facility in Grenoble, France. The imaging and medical beamline (IMBL) at the Australian Synchrotron has recently become available for preclinical radiotherapy and imaging research with clinical trials, a distinct possibility in the coming years. The aim of this present study was to accurately characterize the synchrotron-generated x-ray beam for the purposes of air kerma-based absolute dosimetry. METHODS The authors used a theoretical model of the energy spectrum from the wiggler source and validated this model by comparing the transmission through copper absorbers (0.1-3.0 mm) against real measurements conducted at the beamline. The authors used a low energy free air ionization chamber (LEFAC) from the Australian Radiation Protection and Nuclear Safety Agency and a commercially available free air chamber (ADC-105) for the measurements. The dimensions of these two chambers are different from one another requiring careful consideration of correction factors. RESULTS Measured and calculated half value layer (HVL) and air kerma rates differed by less than 3% for the LEFAC when the ion chamber readings were corrected for electron energy loss and ion recombination. The agreement between measured and predicted air kerma rates was less satisfactory for the ADC-105 chamber, however. The LEFAC and ADC measurements produced a first half value layer of 0.405 ± 0.015 and 0.412 ± 0.016 mm Cu, respectively, compared to the theoretical prediction of 0.427 ± 0.012 mm Cu. The theoretical model based upon a spectrum calculator derived a mean beam energy of 61.4 keV with a first half value layer of approximately 30 mm in water. CONCLUSIONS The authors showed in this study their ability to verify the predicted air kerma rate and x-ray attenuation curve on the IMBL using a simple experimental method, namely, HVL measurements. The HVL measurements strongly supports the x-ray beam spectrum, which in turn has a profound effect on x-ray dosimetry.
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Affiliation(s)
- Jeffrey C Crosbie
- Department of Obstetrics and Gynaecology, University of Melbourne, The Royal Women's Hospital, Parkville, Victoria 3052, Australia.
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Lepodise LM, Horvat J, Lewis RA. Collective librations of water molecules in the crystal lattice of rubidium bromide: experiment and simulation. Phys Chem Chem Phys 2013; 15:20252-61. [PMID: 24165585 DOI: 10.1039/c3cp53667j] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Terahertz spectroscopy of RbBr reveals four prominent absorption lines at room temperature and a further 15 lines at 10 K. Via density-functional-theory (DFT) numerical modelling using the PBE0 hybrid GGA functional, all the absorptions are identified as correlated librations of water molecules in the RbBr lattice. Each libration mode is a combination of rocking, wagging and twisting motions of the water molecules. The number of libration lines and numerical modelling show that the C2v symmetry of water in RbBr is broken. Our modelling shows that the distribution of libration amplitudes and phases for different water molecules in the RbBr unit cell varies greatly between the different modes. All librational lines red-shift with increasing temperature. The rate of change for most lines is in the range 60-90 MHz K(-1) (or (2-3) × 10(-3) cm(-1) K(-1)). Two lines shift more rapidly with temperature, at rates of 240 and 300 MHz K(-1) (or (8 and 10) × 10(-3) cm(-1) K(-1)), respectively. Furthermore, the temperature dependence of the linewidth distinguishes two groups of lines. For one group, with weak linear temperature dependence of linewidth, cubic anharmonic terms in the RbBr crystal field are significant. This group is mainly associated with fully symmetric correlated librations. For the second group, with strong non-linear temperature dependence of the linewidth, quartic anharmonic terms in the RbBr crystal field are significant. However, the distribution of libration amplitudes, as well as the type of libration modes, influence the temperature dependence of the red shift, the linewidth, and the intensity, as well. Our combined experimental and theoretical investigation confirms the necessity of obtaining low-temperature data to observe all the calculated modes; moreover, the richness of detail in the temperature dependence of the data invites further modelling spanning a range of temperatures.
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Affiliation(s)
- L M Lepodise
- Institute for Superconducting and Electronic Materials and School of Physics, University of Wollongong, Wollongong, New South Wales 2522, Australia.
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Lewis RA, Bruno-Alfonso A, de Souza GVB, Vickers REM, Colla JA, Constable E. Spherical, cylindrical and tetrahedral symmetries; hydrogenic states at high magnetic field in Si:P. Sci Rep 2013; 3:3488. [PMID: 24336145 PMCID: PMC3860012 DOI: 10.1038/srep03488] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2013] [Accepted: 11/26/2013] [Indexed: 11/09/2022] Open
Abstract
Phosphorous donors in silicon have an electronic structure that mimics the hydrogen atom, albeit on a larger length, smaller energy and smaller magnetic field scale. While the hydrogen atom is spherically symmetric, an applied magnetic field imposes cylindrical symmetry, and the solid-state analogue involves, in addition, the symmetry of the Si crystal. For one magnetic field direction, all six conduction-band valleys of Si:P become equivalent. New experimental data to high laboratory fields (30 T), supported by new calculations, demonstrate that this high symmetry field orientation allows the most direct comparison with free hydrogen.
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Affiliation(s)
- R A Lewis
- Institute for Superconducting and Electronic Materials, University of Wollongong, Wollongong, New South Wales 2522, Australia
| | - A Bruno-Alfonso
- Faculdade de Ciências, UNESP - Universidade Estadual Paulista, 17033-360, Bauru, SP, Brazil
| | - G V B de Souza
- POSMAT/UNESP - Universidade Estadual Paulista, 17033-360, Bauru, SP, Brazil
| | - R E M Vickers
- Institute for Superconducting and Electronic Materials, University of Wollongong, Wollongong, New South Wales 2522, Australia
| | - J A Colla
- Institute for Superconducting and Electronic Materials, University of Wollongong, Wollongong, New South Wales 2522, Australia
| | - E Constable
- Institute for Superconducting and Electronic Materials, University of Wollongong, Wollongong, New South Wales 2522, Australia
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Hooper SB, Fouras A, Siew ML, Wallace MJ, Kitchen MJ, Te Pas AB, Klingenberg C, Lewis RA, Davis PG, Morley CJ, Schmölzer GM. Correction: Expired CO2 Levels Indicate Degree of Lung Aeration at Birth. PLoS One 2013; 8. [PMID: 29220834 PMCID: PMC5729724 DOI: 10.1371/annotation/44f67041-2f8e-42df-826a-82172ae05a22] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
[This corrects the article DOI: 10.1371/journal.pone.0070895.].
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Hooper SB, Fouras A, Siew ML, Wallace MJ, Kitchen MJ, te Pas AB, Klingenberg C, Lewis RA, Davis PG, Morley CJ, Schmölzer GM. Expired CO2 levels indicate degree of lung aeration at birth. PLoS One 2013; 8:e70895. [PMID: 23951032 PMCID: PMC3741323 DOI: 10.1371/journal.pone.0070895] [Citation(s) in RCA: 63] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2013] [Accepted: 06/24/2013] [Indexed: 11/18/2022] Open
Abstract
As neonatal resuscitation critically depends upon lung aeration at birth, knowledge of the progression of this process is required to guide ongoing care. We investigated whether expired CO2 (ECO2) levels indicate the degree of lung aeration immediately after birth in two animal models and in preterm infants. Lambs were delivered by caesarean section and ventilated from birth. In lambs, ECO2 levels were significantly (p<0.0001) related to tidal volumes and CO2 clearance/breath increased exponentially when tidal volumes were greater than 6 mL/kg. Preterm (28 days of gestation; term = 32 days) rabbits were also delivered by caesarean section and lung aeration was measured using phase contrast X-ray imaging. In rabbit kittens, ECO2 levels were closely related (p<0.001) to lung volumes at end-inflation and were first detected when ∼7% of the distal lung regions were aerated. ECO2 levels in preterm infants at birth also correlated with tidal volumes. In each infant, ECO2 levels increased to >10 mmHg 28 (median) (21–36) seconds before the heart rate increased above 100 beats per minute. These data demonstrate that ECO2 levels can indicate the relative degree of lung aeration after birth and can be used to clinically assess ventilation in the immediate newborn period.
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Affiliation(s)
- Stuart B Hooper
- The Ritchie Centre, Monash Institute of Medical Research, Monash University, Melbourne, Australia.
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Siew ML, Wallace MJ, Allison BJ, Kitchen MJ, te Pas AB, Islam MS, Lewis RA, Fouras A, Yagi N, Uesugi K, Hooper SB. The role of lung inflation and sodium transport in airway liquid clearance during lung aeration in newborn rabbits. Pediatr Res 2013; 73:443-9. [PMID: 23269118 DOI: 10.1038/pr.2012.197] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
BACKGROUND Recent phase-contrast X-ray imaging studies suggest that inspiration primarily drives lung aeration and airway liquid clearance at birth, which questions the role of adrenaline-induced activation of epithelial sodium channels (ENaCs). We hypothesized that pressures generated by inspiration have a greater role in airway liquid clearance than do ENaCs after birth. METHODS Rabbit pups (30 d of gestation) were delivered and sedated, and 0.1 ml of saline (S) or amiloride (Am; an ENaC inhibitor) was instilled into the lungs before mechanical ventilation. Two other groups (30 d of gestation) were treated similarly but were also given adrenaline (S/Ad and Am/Ad) before mechanical ventilation. RESULTS Amiloride and adrenaline did not affect functional residual capacity (FRC) recruitment (P > 0.05). Amiloride increased the rate of FRC loss between inflations (Am: -5.2 ± 0.6 ml/kg/s), whereas adrenaline reduced the rate of FRC loss (S/Ad: -1.9 ± 0.3 ml/kg/s) as compared with saline-treated controls (S: -3.5 ± -0.6 ml/kg/s; P < 0.05). CONCLUSION These data indicate that inspiration is a major determinant of airway liquid clearance and FRC development during positive pressure ventilation. Although ENaC inhibition and adrenaline administration had no detectable effect on FRC development, ENaC may help to prevent liquid from re-entering the airways during expiration.
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Affiliation(s)
- Melissa L Siew
- Ritchie Centre, Monash Institute of Medical Research, Monash University, Clayton, Australia.
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Stevenson AW, Hall CJ, Mayo SC, Häusermann D, Maksimenko A, Gureyev TE, Nesterets YI, Wilkins SW, Lewis RA. Analysis and interpretation of the first monochromatic X-ray tomography data collected at the Australian Synchrotron Imaging and Medical beamline. J Synchrotron Radiat 2012; 19:728-750. [PMID: 22898953 DOI: 10.1107/s0909049512023618] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/16/2012] [Accepted: 05/23/2012] [Indexed: 06/01/2023]
Abstract
The first monochromatic X-ray tomography experiments conducted at the Imaging and Medical beamline of the Australian Synchrotron are reported. The sample was a phantom comprising nylon line, Al wire and finer Cu wire twisted together. Data sets were collected at four different X-ray energies. In order to quantitatively account for the experimental values obtained for the Hounsfield (or CT) number, it was necessary to consider various issues including the point-spread function for the X-ray imaging system and harmonic contamination of the X-ray beam. The analysis and interpretation of the data includes detailed considerations of the resolution and efficiency of the CCD detector, calculations of the X-ray spectrum prior to monochromatization, allowance for the response of the double-crystal Si monochromator used (via X-ray dynamical theory), as well as a thorough assessment of the role of X-ray phase-contrast effects. Computer simulations relating to the tomography experiments also provide valuable insights into these important issues. It was found that a significant discrepancy between theory and experiment for the Cu wire could be largely resolved in terms of the effect of the point-spread function. The findings of this study are important in respect of any attempts to extract quantitative information from X-ray tomography data, across a wide range of disciplines, including materials and life sciences.
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Affiliation(s)
- Andrew W Stevenson
- CSIRO, Materials Science and Engineering, Private Bag 33, Clayton South, Victoria 3169, Australia.
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Du Rand IA, Barber PV, Goldring J, Lewis RA, Mandal S, Munavvar M, Rintoul RC, Shah PL, Singh S, Slade MG, Woolley A. Summary of the British Thoracic Society guidelines for advanced diagnostic and therapeutic flexible bronchoscopy in adults. Thorax 2011; 66:1014-5. [PMID: 22003155 DOI: 10.1136/thoraxjnl-2011-201052] [Citation(s) in RCA: 50] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
This new guideline covers the rapidly advancing field of interventional bronchoscopy using flexible bronchoscopy. It includes the use of more complex diagnostic procedures such as endobronchial ultrasound, interventions for the relief of central airway obstruction due to malignancy and the recent development of endobronchial therapies for chronic obstructive pulmonary disease and asthma. The guideline aims to help all those who undertake flexible bronchoscopy to understand more about this important area. It also aims to inform respiratory physicians and other specialists dealing with lung cancer of the procedures possible in the management and palliation of central airway obstruction. The guideline covers transbronchial needle aspiration and endobronchial ultrasound-guided transbronchial needle aspiration, electrocautery/diathermy, argon plasma coagulation and thermal laser, cryotherapy, cryoextraction, photodynamic therapy, brachytherapy, tracheobronchial stenting, electromagnetic navigation bronchoscopy, endobronchial valves for emphysema and bronchial thermoplasty for asthma.
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Du Rand IA, Barber PV, Goldring J, Lewis RA, Mandal S, Munavvar M, Rintoul RC, Shah PL, Singh S, Slade MG, Woolley A. British Thoracic Society guideline for advanced diagnostic and therapeutic flexible bronchoscopy in adults. Thorax 2011; 66 Suppl 3:iii1-21. [PMID: 21987439 DOI: 10.1136/thoraxjnl-2011-200713] [Citation(s) in RCA: 100] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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