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Evans RA, McAuley H, Harrison EM, Shikotra A, Singapuri A, Sereno M, Elneima O, Docherty AB, Lone NI, Leavy OC, Daines L, Baillie JK, Brown JS, Chalder T, De Soyza A, Diar Bakerly N, Easom N, Geddes JR, Greening NJ, Hart N, Heaney LG, Heller S, Howard L, Hurst JR, Jacob J, Jenkins RG, Jolley C, Kerr S, Kon OM, Lewis K, Lord JM, McCann GP, Neubauer S, Openshaw PJM, Parekh D, Pfeffer P, Rahman NM, Raman B, Richardson M, Rowland M, Semple MG, Shah AM, Singh SJ, Sheikh A, Thomas D, Toshner M, Chalmers JD, Ho LP, Horsley A, Marks M, Poinasamy K, Wain LV, Brightling CE. Physical, cognitive, and mental health impacts of COVID-19 after hospitalisation (PHOSP-COVID): a UK multicentre, prospective cohort study. Lancet Respir Med 2021; 9:1275-1287. [PMID: 34627560 PMCID: PMC8497028 DOI: 10.1016/s2213-2600(21)00383-0] [Citation(s) in RCA: 293] [Impact Index Per Article: 97.7] [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: 05/22/2021] [Revised: 07/30/2021] [Accepted: 08/18/2021] [Indexed: 01/19/2023]
Abstract
BACKGROUND The impact of COVID-19 on physical and mental health and employment after hospitalisation with acute disease is not well understood. The aim of this study was to determine the effects of COVID-19-related hospitalisation on health and employment, to identify factors associated with recovery, and to describe recovery phenotypes. METHODS The Post-hospitalisation COVID-19 study (PHOSP-COVID) is a multicentre, long-term follow-up study of adults (aged ≥18 years) discharged from hospital in the UK with a clinical diagnosis of COVID-19, involving an assessment between 2 and 7 months after discharge, including detailed recording of symptoms, and physiological and biochemical testing. Multivariable logistic regression was done for the primary outcome of patient-perceived recovery, with age, sex, ethnicity, body-mass index, comorbidities, and severity of acute illness as covariates. A post-hoc cluster analysis of outcomes for breathlessness, fatigue, mental health, cognitive impairment, and physical performance was done using the clustering large applications k-medoids approach. The study is registered on the ISRCTN Registry (ISRCTN10980107). FINDINGS We report findings for 1077 patients discharged from hospital between March 5 and Nov 30, 2020, who underwent assessment at a median of 5·9 months (IQR 4·9-6·5) after discharge. Participants had a mean age of 58 years (SD 13); 384 (36%) were female, 710 (69%) were of white ethnicity, 288 (27%) had received mechanical ventilation, and 540 (50%) had at least two comorbidities. At follow-up, only 239 (29%) of 830 participants felt fully recovered, 158 (20%) of 806 had a new disability (assessed by the Washington Group Short Set on Functioning), and 124 (19%) of 641 experienced a health-related change in occupation. Factors associated with not recovering were female sex, middle age (40-59 years), two or more comorbidities, and more severe acute illness. The magnitude of the persistent health burden was substantial but only weakly associated with the severity of acute illness. Four clusters were identified with different severities of mental and physical health impairment (n=767): very severe (131 patients, 17%), severe (159, 21%), moderate along with cognitive impairment (127, 17%), and mild (350, 46%). Of the outcomes used in the cluster analysis, all were closely related except for cognitive impairment. Three (3%) of 113 patients in the very severe cluster, nine (7%) of 129 in the severe cluster, 36 (36%) of 99 in the moderate cluster, and 114 (43%) of 267 in the mild cluster reported feeling fully recovered. Persistently elevated serum C-reactive protein was positively associated with cluster severity. INTERPRETATION We identified factors related to not recovering after hospital admission with COVID-19 at 6 months after discharge (eg, female sex, middle age, two or more comorbidities, and more acute severe illness), and four different recovery phenotypes. The severity of physical and mental health impairments were closely related, whereas cognitive health impairments were independent. In clinical care, a proactive approach is needed across the acute severity spectrum, with interdisciplinary working, wide access to COVID-19 holistic clinical services, and the potential to stratify care. FUNDING UK Research and Innovation and National Institute for Health Research.
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Affiliation(s)
- Rachael A Evans
- Institute for Lung Health, Leicester NIHR Biomedical Research Centre, University of Leicester, Leicester, UK
| | - Hamish McAuley
- Institute for Lung Health, Leicester NIHR Biomedical Research Centre, University of Leicester, Leicester, UK
| | | | - Aarti Shikotra
- Institute for Lung Health, Leicester NIHR Biomedical Research Centre, University of Leicester, Leicester, UK
| | - Amisha Singapuri
- Institute for Lung Health, Leicester NIHR Biomedical Research Centre, University of Leicester, Leicester, UK
| | - Marco Sereno
- Institute for Lung Health, Leicester NIHR Biomedical Research Centre, University of Leicester, Leicester, UK
| | - Omer Elneima
- Institute for Lung Health, Leicester NIHR Biomedical Research Centre, University of Leicester, Leicester, UK
| | | | - Nazir I Lone
- Usher Institute, University of Edinburgh, Edinburgh, UK; Royal Infirmary of Edinburgh, NHS Lothian, Edinburgh, UK
| | - Olivia C Leavy
- Department of Health Sciences, University of Leicester, Leicester, UK
| | - Luke Daines
- Usher Institute, University of Edinburgh, Edinburgh, UK
| | - J Kenneth Baillie
- Roslin Institute, University of Edinburgh, Edinburgh, UK; Royal Infirmary of Edinburgh, NHS Lothian, Edinburgh, UK
| | - Jeremy S Brown
- UCL Respiratory, Department of Medicine, University College London, London, UK
| | - Trudie Chalder
- Department of Psychological Medicine, Institute of Psychiatry, Psychology and Neuroscience, King's College London, London, UK
| | - Anthony De Soyza
- Population Health Sciences Institute, Newcastle University, Newcastle upon Tyne, UK; Newcastle upon Tyne Teaching Hospitals Trust, Newcastle upon Tyne, UK
| | - Nawar Diar Bakerly
- Manchester Metropolitan University, Manchester, UK; Salford Royal NHS Foundation Trust, Manchester, UK
| | - Nicholas Easom
- Infection Research Group, Hull University Teaching Hospitals, Hull, UK
| | - John R Geddes
- NIHR Oxford Health Biomedical Research Centre, University of Oxford, Oxford, UK; Oxford Health NHS Foundation Trust, Oxford, UK
| | - Neil J Greening
- Institute for Lung Health, Leicester NIHR Biomedical Research Centre, University of Leicester, Leicester, UK
| | - Nick Hart
- Lane Fox Respiratory Service, Guy's and St Thomas' NHS Foundation Trust, London, UK
| | - Liam G Heaney
- Wellcome-Wolfson Institute for Experimental Medicine, Queen's University Belfast, Belfast, UK; Belfast Health & Social Care Trust, Belfast, UK
| | - Simon Heller
- Department of Oncology and Metabolism, University of Sheffield, Sheffield, UK
| | - Luke Howard
- Imperial College Healthcare NHS Trust, London, UK, University College London, London, UK
| | - John R Hurst
- UCL Respiratory, Department of Medicine, University College London, London, UK
| | - Joseph Jacob
- Centre for Medical Image Computing, University College London, London, UK; Lungs for Living Research Centre, University College London, London, UK
| | - R Gisli Jenkins
- National Heart and Lung Institute, Imperial College London, London, UK
| | - Caroline Jolley
- Centre for Human and Applied Physiological Sciences, School of Basic and Medical Biosciences, Faculty of Life Sciences and Medicine, King's College London, London, UK
| | - Steven Kerr
- Roslin Institute, University of Edinburgh, Edinburgh, UK
| | - Onn M Kon
- Imperial College Healthcare NHS Trust, London, UK, University College London, London, UK; National Heart and Lung Institute, Imperial College London, London, UK
| | - Keir Lewis
- Hywel Dda University Health Board, Wales, UK; University of Swansea, Swansea, UK; Respiratory Innovation Wales, Llanelli, UK
| | - Janet M Lord
- Institute of Inflammation and Ageing, University of Birmingham, Birmingham, UK
| | - Gerry P McCann
- Department of Cardiovascular Sciences, University of Leicester, Leicester, UK; Leicester NIHR Biomedical Research Centre, University of Leicester, Leicester, UK
| | - Stefan Neubauer
- NIHR Oxford Health Biomedical Research Centre, University of Oxford, Oxford, UK; Division of Cardiovascular Medicine, Radcliffe Department of Medicine, University of Oxford, Oxford, UK
| | | | - Dhruv Parekh
- Institute of Inflammation and Ageing, University of Birmingham, Birmingham, UK; Department of Acute Medicine, Queen Elizabeth Hospital Birmingham, Birmingham, UK
| | - Paul Pfeffer
- Barts Health NHS Trust, London, UK; Queen Mary University of London, London, UK
| | - Najib M Rahman
- Oxford Respiratory Trials Unit, University of Oxford, Oxford, UK
| | - Betty Raman
- Division of Cardiovascular Medicine, Radcliffe Department of Medicine, University of Oxford, Oxford, UK
| | - Matthew Richardson
- Institute for Lung Health, Leicester NIHR Biomedical Research Centre, University of Leicester, Leicester, UK
| | - Matthew Rowland
- Kadoorie Centre for Critical Care Research, Nuffield Department of Clinical Neurosciences, University of Oxford, Oxford, UK
| | - Malcolm G Semple
- NIHR Health Protection Research Unit in Emerging and Zoonotic Infections, Institute of Infection, Veterinary and Ecological Sciences, University of Liverpool, UK; Respiratory Medicine, Alder Hey Children's Hospital, Liverpool, UK
| | - Ajay M Shah
- King's College London British Heart Foundation Centre and King's College Hospital NHS Foundation Trust, London, UK
| | - Sally J Singh
- Institute for Lung Health, Leicester NIHR Biomedical Research Centre, University of Leicester, Leicester, UK
| | - Aziz Sheikh
- Usher Institute, University of Edinburgh, Edinburgh, UK
| | - David Thomas
- Immunology and Inflammation, Imperial College London, London, UK
| | - Mark Toshner
- Cambridge NIHR Biomedical Research Centre, Cambridge, UK; NIHR Cambridge Clinical Research Facility, Cambridge, UK
| | - James D Chalmers
- University of Dundee, Ninewells Hospital and Medical School, Dundee, UK
| | - Ling-Pei Ho
- MRC Human Immunology Unit, University of Oxford, Oxford, UK
| | - Alex Horsley
- Division of Infection, Immunity & Respiratory Medicine, Faculty of Biology, Medicine and Health, University of Manchester, Manchester, UK
| | - Michael Marks
- Department of Clinical Research, London School of Hygiene & Tropical Medicine, London, UK; Hospital for Tropical Diseases, University College London Hospital, London, UK
| | | | - Louise V Wain
- Institute for Lung Health, Leicester NIHR Biomedical Research Centre, University of Leicester, Leicester, UK; Department of Health Sciences, University of Leicester, Leicester, UK
| | - Christopher E Brightling
- Institute for Lung Health, Leicester NIHR Biomedical Research Centre, University of Leicester, Leicester, UK.
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Menden T, Alcaín GB, Stevenson AT, Pollock RD, Tank H, Hodkinson P, Jolley C, Smith TG, Leonhardt S, Walter M. Dynamic lung behavior under high G acceleration monitored with electrical impedance tomography. Physiol Meas 2021; 42. [PMID: 34375953 DOI: 10.1088/1361-6579/ac1c63] [Citation(s) in RCA: 6] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2021] [Accepted: 08/10/2021] [Indexed: 11/11/2022]
Abstract
OBJECTIVE During launch and atmospheric re-entry in suborbital space flights, astronauts are exposed to high G-acceleration. These acceleration levels influence gas exchange inside the lung and can potentially lead to hypoxaemia. The distribution of air inside the lung can be monitored by Electrical Impedance Tomography (EIT). This imaging technique might reveal how high gravitational forces affect the dynamic behavior of ventilation and impair gas exchange resulting in hypoxaemia. APPROACH We performed a trial in a long-arm centrifuge with ten participants lying supine while being exposed to +2, +4 and +6\,Gx(chest-to-back acceleration) to study the magnitude of accelerations experienced during suborbital spaceflight. MAIN RESULTS First, the tomographic images revealed that the dorsal region of the lung emptied faster than the ventral region. Second, the ventilated area shifted from dorsal to ventral. Consequently, alveolar pressure in the dorsal area reached the pressure of the upper airways before the ventral area emptied completely. Finally, the upper airways collapsed and the end-expiratory volume increased. This resulted in ventral gas trapping with restricted gas exchange. SIGNIFICANCE At +4xchanges in ventilation distribution varied considerably between subjects potentially due to variation in individual physical conditions. However, at +6\,Gxall participants were affected similarly and the influence of high gravitational conditions was pronounced.
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Affiliation(s)
- Tobias Menden
- Chair for Medical Information Technology, RWTH Aachen University, Aachen, Nordrhein-Westfalen, GERMANY
| | - Gema B Alcaín
- Chair for Medical Information Technology, RWTH Aachen University, Aachen, Nordrhein-Westfalen, GERMANY
| | - Alec T Stevenson
- QinetiQ EMEA, Farnborough, Hampshire, UNITED KINGDOM OF GREAT BRITAIN AND NORTHERN IRELAND
| | - Ross D Pollock
- King's College London Centre of Human and Aerospace Physiological Sciences, London, London, UNITED KINGDOM OF GREAT BRITAIN AND NORTHERN IRELAND
| | - Henry Tank
- QinetiQ EMEA, Farnborough, Hampshire, UNITED KINGDOM OF GREAT BRITAIN AND NORTHERN IRELAND
| | - Peter Hodkinson
- King's College London Centre of Human and Aerospace Physiological Sciences, London, London, UNITED KINGDOM OF GREAT BRITAIN AND NORTHERN IRELAND
| | - Caroline Jolley
- King's College London Centre of Human and Aerospace Physiological Sciences, London, London, UNITED KINGDOM OF GREAT BRITAIN AND NORTHERN IRELAND
| | - Thomas G Smith
- King's College London Centre of Human and Aerospace Physiological Sciences, London, London, UNITED KINGDOM OF GREAT BRITAIN AND NORTHERN IRELAND
| | - Steffen Leonhardt
- Chair for Medical Information Technology, RWTH Aachen University, Aachen, Nordrhein-Westfalen, GERMANY
| | - Marian Walter
- Chair for Medical Information Technology, RWTH Aachen University, Aachen, Nordrhein-Westfalen, GERMANY
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Whyte MB, Barker R, Kelly PA, Gonzalez E, Czuprynska J, Patel RK, Rea C, Perrin F, Waller M, Jolley C, Arya R, Roberts LN. Three-month follow-up of pulmonary embolism in patients with COVID-19. Thromb Res 2021; 201:113-115. [PMID: 33662797 PMCID: PMC7908844 DOI: 10.1016/j.thromres.2021.02.023] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2021] [Revised: 02/12/2021] [Accepted: 02/15/2021] [Indexed: 12/24/2022]
Affiliation(s)
- Martin B Whyte
- Dept of Medicine, King's College Hospital NHS Foundation Trust, London, UK; Dept Clinical and Experimental Medicine, Faculty of Health and Medical Sciences, University of Surrey, Guildford, UK
| | - Rosemary Barker
- Dept of Medicine, King's College Hospital NHS Foundation Trust, London, UK
| | - Philip A Kelly
- Dept of Medicine, King's College Hospital NHS Foundation Trust, London, UK
| | - Elisa Gonzalez
- Dept of Medicine, King's College Hospital NHS Foundation Trust, London, UK
| | - Julia Czuprynska
- King's Thrombosis Centre, Department of Haematological Medicine, King's College Hospital NHS Foundation Trust, London, UK
| | - Raj K Patel
- King's Thrombosis Centre, Department of Haematological Medicine, King's College Hospital NHS Foundation Trust, London, UK
| | - Catherine Rea
- King's Thrombosis Centre, Department of Haematological Medicine, King's College Hospital NHS Foundation Trust, London, UK
| | - Felicity Perrin
- Department of Respiratory Medicine, King's College Hospital NHS Foundation Trust, London, UK
| | - Michael Waller
- Department of Respiratory Medicine, King's College Hospital NHS Foundation Trust, London, UK; Centre for Human and Applied Physiological Sciences, King's College London, London, UK
| | - Caroline Jolley
- Centre for Human and Applied Physiological Sciences, King's College London, London, UK
| | - Roopen Arya
- King's Thrombosis Centre, Department of Haematological Medicine, King's College Hospital NHS Foundation Trust, London, UK
| | - Lara N Roberts
- King's Thrombosis Centre, Department of Haematological Medicine, King's College Hospital NHS Foundation Trust, London, UK.
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Bruce RM, Jolley C, White MJ. Control of exercise hyperpnoea: Contributions from thin-fibre skeletal muscle afferents. Exp Physiol 2019; 104:1605-1621. [PMID: 31429500 DOI: 10.1113/ep087649] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [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: 07/24/2019] [Accepted: 08/16/2019] [Indexed: 12/16/2022]
Abstract
NEW FINDINGS What is the topic of this review? In this review, we examine the evidence for control mechanisms underlying exercise hyperpnoea, giving attention to the feedback from thin-fibre skeletal muscle afferents, and highlight the frequently conflicting findings and difficulties encountered by researchers using a variety of experimental models. What advances does it highlight? There has been a recent resurgence of interest in the role of skeletal muscle afferent involvement, not only as a mechanism of healthy exercise hyperpnoea but also in the manifestation of breathlessness and exercise intolerance in chronic disease. ABSTRACT The ventilatory response to dynamic submaximal exercise is immediate and proportional to metabolic rate, which maintains isocapnia. How these respiratory responses are controlled remains poorly understood, given that the most tightly controlled variable (arterial partial pressure of CO2 /H+ ) provides no error signal for arterial chemoreceptors to trigger reflex increases in ventilation. This review discusses evidence for different postulated control mechanisms, with a focus on the feedback from group III/IV skeletal muscle mechanosensitive and metabosensitive afferents. This concept is attractive, because the stimulation of muscle mechanoreceptors might account for the immediate increase in ventilation at the onset of exercise, and signals from metaboreceptors might be proportional to metabolic rate. A variety of experimental models have been used to establish the contribution of thin-fibre muscle afferents in ventilatory control during exercise, with equivocal results. The inhibition of afferent feedback via the application of lumbar intrathecal fentanyl during exercise suppresses ventilation, which provides the most compelling supportive evidence to date. However, stimulation of afferent feedback at rest has no consistent effect on respiratory output. However, evidence is emerging for synergistic interactions between muscle afferent feedback and other stimulatory inputs to the central respiratory neuronal pool. These seemingly hyperadditive effects might explain the conflicting findings encountered when using different experimental models. We also discuss the increasing evidence that patients with certain chronic diseases exhibit exaggerated muscle afferent activation during exercise, resulting in enhanced cardiorespiratory responses. This might provide a neural link between the well-established limb muscle dysfunction and the associated exercise intolerance and exertional dyspnoea, which might offer therapeutic targets for these patients.
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Affiliation(s)
- Richard M Bruce
- Centre for Human and Applied Physiological Sciences, School of Basic and Medical Sciences, King's College London, London, UK
| | - Caroline Jolley
- Centre for Human and Applied Physiological Sciences, School of Basic and Medical Sciences, King's College London, London, UK
| | - Michael J White
- School of Sport, Exercise and Rehabilitation Sciences, University of Birmingham, Birmingham, UK
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Maddocks M, Reilly CC, Jolley C, Higginson IJ. What Next in Refractory Breathlessness? Breathlessness? Research Questions for Palliative Care. J Palliat Care 2018. [DOI: 10.1177/082585971403000405] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Affiliation(s)
- Matthew Maddocks
- Department of Palliative Care, Policy and Rehabilitation, Cicely Saunders Institute, King's College London, London, SE5 9PJ, UK
| | - Charles C. Reilly
- King's College Hospital NHS Foundation Trust, London, UK; Department of Respiratory Medicine, King's College London, London, UK; Department of Palliative Care, Policy and Rehabilitation, Cicely Saunders Institute, King's College London, London, UK
| | - Caroline Jolley
- King's College Hospital NHS Foundation Trust, London, UK; Department of Respiratory Medicine, King's College London, London, UK; Department of Palliative Care, Policy and Rehabilitation, Cicely Saunders Institute, King's College London, London, UK
| | - Irene J. Higginson
- King's College Hospital NHS Foundation Trust, London, UK; Department of Respiratory Medicine, King's College London, London, UK; Department of Palliative Care, Policy and Rehabilitation, Cicely Saunders Institute, King's College London, London, UK
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Healey A, Roberts S, Sevdalis N, Goulding L, Wilson S, Shaw K, Jolley C, Robson D. A Cost-Effectiveness Analysis of Stop Smoking Interventions in Substance-Use Disorder Populations. Nicotine Tob Res 2018; 21:623-630. [DOI: 10.1093/ntr/nty087] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2017] [Accepted: 04/30/2018] [Indexed: 12/21/2022]
Affiliation(s)
- Andrew Healey
- King’s Improvement Science, King’s College London, UK
| | - Sarah Roberts
- King’s Improvement Science, King’s College London, UK
| | - Nick Sevdalis
- King’s Improvement Science, King’s College London, UK
| | - Lucy Goulding
- King’s Improvement Science, King’s College London, UK
| | - Sophie Wilson
- King’s Improvement Science, King’s College London, UK
| | - Kate Shaw
- King’s Improvement Science, King’s College London, UK
| | - Caroline Jolley
- Centre of Human & Aerospace Physiological Sciences, School of Basic & Medical Biosciences, Faculty of Life Sciences & Medicine, King’s College London, UK
- Department of Respiratory Medicine, King’s College Hospital NHS Foundation Trust, UK
| | - Deborah Robson
- Addictions Department, Institute of Psychiatry, Psychology & Neuroscience, King’s College London, UK
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Abstract
Steier, Joerg, Nic Cade, Ben Walker, John Moxham, and Caroline Jolley. Observational study of neural respiratory drive during sleep at high altitude. High Alt Med Biol. 18:242-248, 2017. AIMS Ventilation at altitude changes due to altered levels of pO2, pCO2 and the effect on blood pH. Nocturnal ventilation is particularly exposed to these changes. We hypothesized that an increasing neural respiratory drive (NRD) is associated with the severity of sleep-disordered breathing at altitude. METHODS Mountaineers were studied at sea level (London, United Kingdom), and at altitude at the Aconcagua (Andes, Argentina). NRD was measured as electromyogram of the diaphragm (EMGdi) overnight by a transesophageal multi-electrode catheter; results were reported for sea level, 3,380 m, 4,370 m, and 5,570 m. RESULTS Four healthy subjects (3 men, age 31(3)years, body mass index 23.6(0.9)kg/m2, neck circumference 37.0(2.7)cm, forced expiratory volume in 1 second 111.8(5.1)%predicted, and forced vital capacity 115.5(6.3)%predicted) were studied. No subject had significant sleep abnormalities at sea level. Time to ascent to 3,380 m was 1 day, to 4,370 m was 5 days, and the total nights at altitude were 21 days. The oxygen desaturation index (4% oxygen desaturation index [ODI] 0.8(0.4), 22.0 (7.2), 61.4 (26.9), 144.9/hour, respectively) and the EMGdi (5.2 (1.9), 12.8 (5.1), 14.1 (3.4), 18.5%, respectively) increased with the development of periodic breathing at altitude, whereas the average SpO2 declined (97.5 (1.3), 84.8 (0.5), 81.0 (4.1), 68.5%, respectively). The average EMGdi correlated well with the 4%ODI (r = 0.968, p = 0.032). CONCLUSION NRD sleep increases at altitude in relation to the severity of periodic breathing.
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Affiliation(s)
- Joerg Steier
- 1 Faculty of Life Sciences and Medicine, King's College London , London, United Kingdom .,2 Lane Fox Respiratory Unit and Sleep Disorders Centre, Guy's and St. Thomas' NHS Foundation , London, United Kingdom
| | - Nic Cade
- 3 Synthetic and Systems Biochemistry of the Microtubule Cytoskeleton Laboratory, Francis Crick Institute , London, United Kingdom
| | - Ben Walker
- 1 Faculty of Life Sciences and Medicine, King's College London , London, United Kingdom
| | - John Moxham
- 1 Faculty of Life Sciences and Medicine, King's College London , London, United Kingdom
| | - Caroline Jolley
- 1 Faculty of Life Sciences and Medicine, King's College London , London, United Kingdom
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Currow DC, Abernethy AP, Allcroft P, Banzett RB, Bausewein C, Booth S, Carrieri-Kohlman V, Davidson P, Disler R, Donesky D, Dudgeon D, Ekstrom M, Farquhar M, Higginson I, Janssen D, Jensen D, Jolley C, Krajnik M, Laveneziana P, McDonald C, Maddocks M, Morelot-Panzini C, Moxham J, Mularski RA, Noble S, O'Donnell D, Parshall MB, Pattinson K, Phillips J, Ross J, Schwartzstein RM, Similowski T, Simon ST, Smith T, Wells A, Yates P, Yorke J, Johnson MJ. The need to research refractory breathlessness. Eur Respir J 2017; 47:342-3. [PMID: 26721965 DOI: 10.1183/13993003.00653-2015] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Affiliation(s)
- David C Currow
- Dept of Flinders University, Palliative and Supportive Services, Bedford Park, Australia
| | - Amy P Abernethy
- Duke University Medical Center, Dept of Medicine, Durham, NC, USA
| | | | - Robert B Banzett
- Beth Israel Deaconess Medical Center, Division of Pulmonary, Critical Care, and Sleep Medicine, Boston, MA, USA Harvard Medical School, Medicine, Boston, MA, USA
| | - Claudia Bausewein
- University Hospital of Munich, Interdisciplinary Centre for Palliative Medicine, Munich, Germany King's College London, Cicely Saunders Institute, Department of Palliative Care, Policy and Rehabilitation, WHO Collaborating Centre for Palliative Care and Older People, London, UK
| | - Sara Booth
- Cambridge University Hospitals, Palliative Medicine, Cambridge, UK
| | | | | | - Rebecca Disler
- University of Technology Sydney, Faculty of Health, Broadway, Australia
| | - DorAnne Donesky
- University of California, Dept of Physiological Nursing, San Francisco, CA, USA
| | | | - Magnus Ekstrom
- Department of Medicine, Blekinge Hospital, Karlskrona, Sweden
| | - Morag Farquhar
- University of Cambridge, Public Health and Primary Care, GPPCRU Insititute of Public Health, Cambridge, UK
| | - Irene Higginson
- Cicely Saunders Institute, Palliative Care, Policy and Rehabilitation, King's College London, London, UK
| | - Daisy Janssen
- CIRO+, Centre of Expertise for Chronic Organ Failure, Program Development Centre, Horn, The Netherlands
| | - Dennis Jensen
- McGill University, Kinesiology and Physical Education, Montreal, QC, Canada
| | - Caroline Jolley
- King's College London School of Medicine, King's Health Partners' Division of Asthma, Allergy and Lung Biology, Respiratory Medicine, London, UK
| | - Malgorzata Krajnik
- Collegium Medicum of the Nicolaus Copernicus University, Palliative Care, Bydgoszcz, Poland
| | - Pierantonio Laveneziana
- Hôpital Universitaire Pitié-Salpêtrière (AP-HP), Service d'Explorations Fonctionnelles de la Respiration, de l'Exercice et de la Dyspnée, Paris, France Sorbonne Universités, UPMC Université Paris 06, INSERM UMR_S 1158, Neurophysiologie Respiratoire Expérimentale et Clinique - Faculté de Médecine Pierre et Marie Curie, Paris, France
| | | | - Matthew Maddocks
- King's College London, Cicely Saunders Institute, Denmark Hill, London, UK
| | | | | | - Richard A Mularski
- Kaiser Permanente Northwest, The Center for Health Research, Portland, OR, USA
| | | | | | - Mark B Parshall
- University of New Mexico, College of Nursing, Albuquerque, NM, USA
| | - Kyle Pattinson
- Oxford University Hospitals, John Radcliffe Hospital, Oxford, UK
| | - Jane Phillips
- University of Technology, Centre for Cardiovascular and Chronic Care, Sydney, Australia
| | - Joy Ross
- Royal Marsden Hospital, London, UK
| | | | | | | | | | | | - Patsy Yates
- Queensland University of Technology, School of Nursing, Brisbane, Australia
| | - Janelle Yorke
- University of Manchester, School of Nursing, Midwifery and Social Work, Manchester, UK
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Jolley C, Luo Y, Steier J, Sylvester K, Man W, Rafferty G, Polkey M, Moxham J. Neural respiratory drive and symptoms that limit exercise in chronic obstructive pulmonary disease. Lancet 2015; 385 Suppl 1:S51. [PMID: 26312873 DOI: 10.1016/s0140-6736(15)60366-x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [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: 11/15/2022]
Abstract
BACKGROUND Exercise capacity in chronic obstructive pulmonary disease (COPD) is limited by both breathlessness and leg muscle fatigue. Neural respiratory drive, measured as diaphragm electromyogram (EMGdi) activity expressed as a proportion of maximum (EMGdi%max), quantifies the mechanical load on the respiratory muscles and relates closely to breathlessness. We tested the hypothesis that end-exercise EMGdi%max would be higher in patients stopping because of breathlessness than in those limited by leg fatigue. METHODS EMGdi, ventilation, rate of oxygen consumption (VO2), and ventilatory reserve (ventilation/maximum ventilatory volume ratio [VE/MVV]) were measured continuously in patients with COPD during exhaustive cycle ergometry. EMGdi was measured with a multipair oesophageal catheter passed per-nasally. Differences in physiological variables between groups of patients stopping because of breathlessness, leg fatigue, or both were assessed with one-way ANOVA. FINDINGS 23 patients were included (median FEV1, 39% of predicted, IQR 30·0-56·8). End-exercise EMGdi%max was significantly higher in patients stopping exercise because of breathlessness (n=12, median EMGdi%max 75·7% [IQR 69·5-77·1]) than in those stopping because of leg fatigue (n=8, 44·1 [39·4-63·3]) or both (n=3, 74·1 [63·6-81·2]) (p=0·02). There were no significant differences between the groups in end-exercise ventilation (breathlessness 25·7 L/min [16·3-32·0] vs leg fatigue 31·5 [20·9-39·6] vs both 22·0 [17·7-35·7]), VO2, (13·4 mL/min per kg [11·6-14·2] vs 12·1 [10·4-14·8] vs 9·4 [9·1-12·4]), or VE/MVV (80·4% [72·6-88·3] vs 57·8 [52·1-92·6] vs 63·9 [34·5-88·9]). INTERPRETATION These results suggest that patients limited by breathlessness due to ventilatory constraints can be identified as those reaching near-maximum levels of neural respiratory drive during exercise. Measurement of EMGdi%max during exercise could prove useful in identifying patients whose functional performance would be best optimised by improvment in pulmonary mechanics rather than interventions to train peripheral muscle groups. FUNDING None.
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Affiliation(s)
- Caroline Jolley
- Division of Asthma, Allergy and Lung Biology, King's College London School of Medicine, King's Health Partners, London, UK.
| | - Yuanming Luo
- State Key Laboratory of Respiratory Disease, Guangzhou Medical College, Guangzhou, China
| | - Joerg Steier
- Division of Asthma, Allergy and Lung Biology, King's College London School of Medicine, King's Health Partners, London, UK; Lane Fox Respiratory Unit and Sleep Disorders Centre, Guy's & St Thomas' NHS Foundation Trust, London, UK
| | - Karl Sylvester
- Lung Function Department, Cambridge University Hospitals NHS Foundation Trust, Addenbrooke's Hospital, Cambridge, UK
| | - William Man
- NIHR Respiratory Biomedical Research Unit, Royal Brompton and Harefield NHS Foundation Trust, London, UK; Imperial College London, London, UK
| | - Gerrard Rafferty
- Division of Asthma, Allergy and Lung Biology, King's College London School of Medicine, King's Health Partners, London, UK
| | - Michael Polkey
- NIHR Respiratory Biomedical Research Unit, Royal Brompton and Harefield NHS Foundation Trust, London, UK; Imperial College London, London, UK
| | - John Moxham
- Division of Asthma, Allergy and Lung Biology, King's College London School of Medicine, King's Health Partners, London, UK
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Smith L, Reilly C, MacBean V, Jolley C, Elston C, Moxham J, Rafferty G. S55 Neural Respiratory Drive Using Parasternal Electromyography In Clinically Stable Cystic Fibrosis Patients: A Physiological Marker Of Lung Disease Severity And Exercise Capacity. Thorax 2014. [DOI: 10.1136/thoraxjnl-2014-206260.61] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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Kaaba A, Jolley C, MacBean V, Reilly C, Birring S, Moxham J, Rafferty G. S54 Neural Respiratory Drive Measured Using Parasternal Intercostal Muscle Electromyography In Patients With Interstitial Lung Disease. Thorax 2014. [DOI: 10.1136/thoraxjnl-2014-206260.60] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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Jolley C, Luo Y, Steier J, Sylvester K, Man W, Rafferty G, Polkey M, Moxham J. S53 Neural Respiratory Drive And Symptoms Limiting Exercise Capacity In Chronic Obstructive Pulmonary Disease. Thorax 2014. [DOI: 10.1136/thoraxjnl-2014-206260.59] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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Affiliation(s)
- Caroline Jolley
- Kings College London; Department of Respiratory Medicine; King's College Hospital; London SE5 9PJ UK
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Maddocks M, Reilly CC, Jolley C, Higginson IJ. What next in refractory breathlessness? Research questions for palliative care. J Palliat Care 2014; 30:271-278. [PMID: 25962259] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Refractory breathlessness is a common and distressing symptom among patients receiving palliative care. Improvements in the assessment and management of refractory breathlessness are dependent on further research. In this article, we have outlined research topics on which to base future work.
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Hopkinson N, Wallis C, Higgins B, Gaduzo S, Sherrington R, Keilty S, Stern M, Britton J, Bush A, Moxham J, Sylvester K, Griffiths V, Sutherland T, Crossingham I, Raju R, Spencer C, Safavi S, Deegan P, Seymour J, Hickman K, Hughes J, Wieboldt J, Shaheen F, Peedell C, Mackenzie N, Nicholl D, Jolley C, Crooks G, Crooks G, Dow C, Deveson P, Bintcliffe O, Gray B, Kumar S, Haney S, Docherty M, Thomas A, Chua F, Dwarakanath A, Summers G, Prowse K, Lytton S, Ong YE, Graves J, Banerjee T, English P, Leonard A, Brunet M, Chaudhry N, Ketchell RI, Cummings N, Lebus J, Sharp C, Meadows C, Harle A, Stewart T, Parry D, Templeton-Wright S, Moore-Gillon J, Stratford- Martin J, Saini S, Matusiewicz S, Merritt S, Dowson L, Satkunam K, Hodgson L, Suh ES, Durrington H, Browne E, Walters N, Steier J, Barry S, Griffiths M, Hart N, Nikolic M, Berry M, Thomas A, Miller J, McNicholl D, Marsden P, Warwick G, Barr L, Adeboyeku D, Mohd Noh MS, Griffiths P, Davies L, Quint J, Lyall R, Shribman J, Collins A, Goldman J, Bloch S, Gill A, Man W, Christopher A, Yasso R, Rajhan A, Shrikrishna D, Moore C, Absalom G, Booton R, Fowler RW, Mackinlay C, Sapey E, Lock S, Walker P, Jha A, Satia I, Bradley B, Mustfa N, Haqqee R, Thomas M, Patel A, Redington A, Pillai A, Keaney N, Fowler S, Lowe L, Brennan A, Morrison D, Murray C, Hankinson J, Dutta P, Maddocks M, Pengo M, Curtis K, Rafferty G, Hutchinson J, Whitfield R, Turner S, Breen R, Naveed SUN, Goode C, Esterbrook G, Ahmed L, Walker W, Ford D, Connett G, Davidson P, Elston W, Stanton A, Morgan D, Myerson J, Maxwell D, Harrris A, Parmar S, Houghton C, Winter R, Puthucheary Z, Thomson F, Sturney S, Harvey J, Haslam PL, Patel I, Jennings D, Range S, Mallia-Milanes B, Collett A, Tate P, Russell R, Feary J, O'Driscoll R, Eaden J, Round J, Sharkey E, Montgomery M, Vaughan S, Scheele K, Lithgow A, Partridge S, Chavasse R, Restrick L, Agrawal S, Abdallah S, Lacy-Colson A, Adams N, Mitchell S, Haja Mydin H, Ward A, Denniston S, Steel M, Ghosh D, Connellan S, Rigge L, Williams R, Grove A, Anwar S, Dobson L, Hosker H, Stableforth D, Greening N, Howell T, Casswell G, Davies S, Tunnicliffe G, Mitchelmore P, Phitidis E, Robinson L, Prowse K, Bafadhel M, Robinson G, Boland A, Lipman M, Bourke S, Kaul S, Cowie C, Forrest I, Starren E, Burke H, Furness J, Bhowmik A, Everett C, Seaton D, Holmes S, Doe S, Parker S, Graham A, Paterson I, Maqsood U, Ohri C, Iles P, Kemp S, Iftikhar A, Carlin C, Fletcher T, Emerson P, Beasley V, Ramsay M, Buttery R, Mungall S, Crooks S, Ridyard J, Ross D, Guadagno A, Holden E, Coutts I, Cullen K, O'Connor S, Barker J, Sloper K, Watson J, Smith P, Anderson P, Brown L, Nyman C, Milburn H, Clive A, Serlin M, Bolton C, Fuld J, Powell H, Dayer M, Woolhouse I, Georgiadi A, Leonard H, Dodd J, Campbell I, Ruiz G, Zurek A, Paton JY, Malin A, Wood F, Hynes G, Connell D, Spencer D, Brown S, Smith D, Cooper D, O'Kane C, Hicks A, Creagh-Brown B, Lordan J, Nickol A, Primhak R, Fleming L, Powrie D, Brown J, Zoumot Z, Elkin S, Szram J, Scaffardi A, Marshall R, Macdonald I, Lightbody D, Farmer R, Wheatley I, Radnan P, Lane I, Booth A, Tilbrook S, Capstick T, Hewitt L, McHugh M, Nelson C, Wilson P, Padmanaban V, White J, Davison J, O'Callaghan U, Hodson M, Edwards J, Campbell C, Ward S, Wooler E, Ringrose E, Bridges D, Long A, Parkes M, Clarke S, Allen B, Connelly C, Forster G, Hoadley J, Martin K, Barnham K, Khan K, Munday M, Edwards C, O'Hara D, Turner S, Pieri-Davies S, Ford K, Daniels T, Wright J, Towns R, Fern K, Butcher J, Burgin K, Winter B, Freeman D, Olive S, Gray L, Pye K, Roots D, Cox N, Davies CA, Wicker J, Hilton K, Lloyd J, MacBean V, Wood M, Kowal J, Downs J, Ryan H, Guyatt F, Nicoll D, Lyons E, Narasimhan D, Rodman A, Walmsley S, Newey A, Buxton M, Dewar M, Cooper A, Reilly J, Lloyd J, Macmillan AB, Roots D, Olley A, Voase N, Martin S, McCarvill I, Christensen A, Agate R, Heslop K, Timlett A, Hailes K, Davey C, Pawulska B, Lane A, Ioakim S, Hough A, Treharne J, Jones H, Winter-Burke A, Miller L, Connolly B, Bingham L, Fraser U, Bott J, Johnston C, Graham A, Curry D, Sumner H, Costello CA, Bartoszewicz C, Badman R, Williamson K, Taylor A, Purcell H, Barnett E, Molloy A, Crawfurd L, Collins N, Monaghan V, Mir M, Lord V, Stocks J, Edwards A, Greenhalgh T, Lenney W, McKee M, McAuley D, Majeed A, Cookson J, Baker E, Janes S, Wedzicha W, Lomas Dean D, Harrison B, Davison T, Calverley P, Wilson R, Stockley R, Ayres J, Gibson J, Simpson J, Burge S, Warner J, Lenney W, Thomson N, Davies P, Woodcock A, Woodhead M, Spiro S, Ormerod L, Bothamley G, Partridge M, Shields M, Montgomery H, Simonds A, Barnes P, Durham S, Malone S, Arabnia G, Olivier S, Gardiner K, Edwards S. Children must be protected from the tobacco industry's marketing tactics. BMJ 2013; 347:f7358. [PMID: 24324220 DOI: 10.1136/bmj.f7358] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Affiliation(s)
- Nicholas Hopkinson
- British Thoracic Society Chronic Obstructive Pulmonary Disease Specialist Advisory Group, National Heart and Lung Institute, Imperial College, London SW3 6NP, UK
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Reilly CC, Bausewein C, Jolley C, Kelly J, Bellas H, Mandan P, Panell C, Wolf-Linder SD, Brink E, Biase CD, Moxham J, Higginson IJ. P30 Feasibility of a New Out-Patient Breathlessness Support Service. Thorax 2012. [DOI: 10.1136/thoraxjnl-2012-202678.171] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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Bausewein C, Jolley C, Reilly C, Lobo P, Kelly J, Bellas H, Madan P, Panell C, Brink E, De Biase C, Gao W, Murphy C, McCrone P, Moxham J, Higginson IJ. Development, effectiveness and cost-effectiveness of a new out-patient Breathlessness Support Service: study protocol of a phase III fast-track randomised controlled trial. BMC Pulm Med 2012; 12:58. [PMID: 22992240 PMCID: PMC3517322 DOI: 10.1186/1471-2466-12-58] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.7] [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: 07/03/2012] [Accepted: 09/12/2012] [Indexed: 11/29/2022] Open
Abstract
Background Breathlessness is a common and distressing symptom affecting many patients with advanced disease both from malignant and non-malignant origin. A combination of pharmacological and non-pharmacological measures is necessary to treat this symptom successfully. Breathlessness services in various compositions aim to provide comprehensive care for patients and their carers by a multiprofessional team but their effectiveness and cost-effectiveness have not yet been proven. The Breathlessness Support Service (BSS) is a newly created multiprofessional and interdisciplinary outpatient service at a large university hospital in South East London. The aim of this study is to develop and evaluate the effectiveness and cost effectiveness of this multidisciplinary out–patient BSS for the palliation of breathlessness, in advanced malignant and non-malignant disease. Methods The BSS was modelled based on the results of qualitative and quantitative studies, and systematic literature reviews. A randomised controlled fast track trial (RCT) comprising two groups: 1) intervention (immediate access to BSS in addition to standard care); 2) control group (standard best practice and access to BSS after a waiting time of six weeks). Patients are included if suffering from breathlessness on exertion or at rest due to advanced disease such as cancer, chronic obstructive pulmonary disease (COPD), chronic heart failure (CHF), interstitial lung disease (ILD) or motor neurone disease (MND) that is refractory to maximal optimised medical management. Both quantitative and qualitative outcomes are assessed in face to-face interviews at baseline, after 6 and 12 weeks. The primary outcome is patients' improvement of mastery of breathlessness after six weeks assessed on the Chronic Respiratory Disease Questionnaire (CRQ). Secondary outcomes for patients include breathlessness severity, symptom burden, palliative care needs, service use, and respiratory measures (spirometry). For analyses, the primary outcome, mastery of breathlessness after six weeks, will be analysed using ANCOVA. Selection of covariates will depend on baseline differences between the groups. Analyses of secondary outcomes will include patients’ symptom burden other than breathlessness, physiological measures (lung function, six minute walk distance), and caregiver burden. Discussion Breathlessness services aim to meet the needs of patients suffering from this complex and burdensome symptom and their carers. The newly created BSS is different to other current services as it is run in close collaboration of palliative medicine and respiratory medicine to optimise medical care of patients. It also involves professionals from various medical, nursing, physiotherapy, occupational therapy and social work background. Trial registration ClinicalTrials.gov (NCT01165034)
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Affiliation(s)
- Claudia Bausewein
- King's College London, Cicely Saunders Institute, Department of Palliative Care, Policy and Rehabilitation, London, UK.
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Dyer F, Flude L, Bazari F, Jolley C, Englebretsen C, Lai D, Polkey MI, Hopkinson NS. Non-invasive ventilation (NIV) as an aid to rehabilitation in acute respiratory disease. BMC Pulm Med 2011; 11:58. [PMID: 22177338 PMCID: PMC3260154 DOI: 10.1186/1471-2466-11-58] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [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: 06/06/2011] [Accepted: 12/16/2011] [Indexed: 11/26/2022] Open
Abstract
Background Non-invasive ventilation (NIV) can increase exercise tolerance, reduce exercise induced desaturation and improve the outcome of pulmonary rehabilitation in patients with chronic respiratory disease. It is not known whether it can be applied to increase exercise capacity in patients admitted with non-hypercapnic acute exacerbations of COPD (AECOPD). We investigated the acceptability and feasibility of using NIV for this purpose. Methods On a single occasion, patients admitted with an acute exacerbation of chronic respiratory disease who were unable to cycle for five minutes at 20 watts attempted to cycle using NIV and their endurance time (Tlim) was recorded. To determine feasibility of this approach in clinical practice patients admitted with AECOPD were screened for participation in a trial of regular NIV assisted rehabilitation during their hospital admission. Results In 12 patients tested on a single occasion NIV increased Tlim from 184(65) seconds to 331(229) seconds (p = 0.04) and patients desaturated less (median difference = 3.5%, p = 0.029). In the second study, 60 patients were admitted to hospital during a three month period of whom only 18(30)% were eligible to participate and of these patients, only four (7%) consented to participate. Conclusion NIV improves exercise tolerance in patients with acute exacerbations of chronic respiratory disease but the applicability of this approach in routine clinical practice may be limited. Trial registration http://www.controlled-trials.com/ISRCTN35692743
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Affiliation(s)
- Fran Dyer
- The NIHR Respiratory Biomedical Research Unit at Royal Brompton, London, UK
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Dyer F, Bazari F, Jolley C, Flude L, Lord V, Polkey MI, Hopkinson NS. P269 Feasibility and acceptability of non-invasive ventilation (NIV) as an aid to exercise in patients admitted with acute exacerbation of chronic respiratory disease. Thorax 2011. [DOI: 10.1136/thoraxjnl-2011-201054c.269] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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Murphy PB, Kumar A, Reilly C, Jolley C, Walterspacher S, Fedele F, Hopkinson NS, Man WDC, Polkey MI, Moxham J, Hart N. Neural respiratory drive as a physiological biomarker to monitor change during acute exacerbations of COPD. Thorax 2011; 66:602-8. [PMID: 21597112 DOI: 10.1136/thx.2010.151332] [Citation(s) in RCA: 78] [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] [Indexed: 11/03/2022]
Abstract
BACKGROUND Acute exacerbations of chronic obstructive pulmonary disease have a significant negative impact on both patients and healthcare systems. Currently, there are no physiological biomarkers that effectively monitor clinical change or predict respiratory readmission. Acute exacerbations impose a change in the respiratory muscle load-capacity-drive relationship. It was hypothesised that lack of a fall in neural respiratory drive would identify patients at risk of treatment failure and early hospital readmission. METHODS An observational study was performed at two UK teaching hospitals. Routine clinical physiological parameters and neural respiratory drive index (NRDI), calculated as the product of second intercostal space parasternal electromyography (EMG) activity normalised to the peak EMG activity during a maximum inspiratory sniff manoeuvre and respiratory rate, were recorded daily from admission to discharge. RESULTS 30 acutely unwell patients of mean (SD) age 72 (10) years, forced expiratory volume in 1 s 0.60 (1.65) l, NRDI 455 (263) AU and median length of stay 6 days were studied. Changes in NRDI correlated with changes in Borg score (r=+0.60; p<0.001), discriminated between patients deemed to have clinically improved rather than deteriorated (mean difference 339 AU; 95% CI 234 to 444; p<0.001) and identified those patients readmitted within 14 days (mean difference 203 AU; 95% CI 39 to 366; p=0.017). CONCLUSIONS NRDI is a feasible clinical physiological parameter in patients with an acute exacerbation of chronic obstructive pulmonary disease and can provide useful information on treatment response and risk of readmission.
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Affiliation(s)
- Patrick B Murphy
- Lane Fox Respiratory Unit, St Thomas' Hospital, Westminster Bridge Road, London SE1 7EH, UK.
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Luo Y, Li R, Jolley C, Wu H, Steier J, Moxham J, Zhong N. Neural Respiratory Drive in Patients with COPD during Exercise Tests. Respiration 2011; 81:294-301. [DOI: 10.1159/000317136] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2009] [Accepted: 04/05/2010] [Indexed: 11/19/2022] Open
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Reilly C, Jolley C, Elston C, Rafferty GF, Moxham J. P101 Surface parasternal intercostal electromyogram (sEMGpara) as a monitoring tool in cystic fibrosis. Thorax 2010. [DOI: 10.1136/thx.2010.150987.2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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Qin YY, Steier J, Jolley C, Moxham J, Zhong NS, Luo YM. Efficiency of Neural Drive During Exercise in Patients With COPD and Healthy Subjects. Chest 2010; 138:1309-15. [DOI: 10.1378/chest.09-2824] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/01/2022] Open
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Kassim Z, Jolley C, Moxham J, Greenough A, Rafferty GF. Diaphragm electromyogram in infants with abdominal wall defects and congenital diaphragmatic hernia. Eur Respir J 2010; 37:143-9. [PMID: 20516054 DOI: 10.1183/09031936.00007910] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Measurement of the diaphragm electromyogram (EMGdi) elicited by phrenic nerve stimulation could be useful to assess neonates suffering from respiratory distress due to diaphragm dysfunction, as observed in infants with abdominal wall defects (AWD) or congenital diaphragmatic hernia (CDH). The study aims were to assess the feasibility of recording EMGdi using a multipair oesophageal electrode catheter and examine whether diaphragm muscle and/or phrenic nerve function was compromised in AWD or CDH infants. Diaphragm compound muscle action potentials elicited by magnetic phrenic nerve stimulation were recorded from 18 infants with surgically repaired AWD (n = 13) or CDH (n = 5), median (range) gestational age 36.5 (34-40) weeks. Diaphragm strength was assessed as twitch transdiaphragmatic pressure (TwP(di)). One AWD patient had prolonged phrenic nerve latency (PNL) bilaterally (left 9.31 ms, right 9.49 ms) and two CDH patients had prolonged PNL on the affected side (10.1 ms and 10.08 ms). There was no difference in left and right TwP(di) in either group. PNL correlated significantly with TwP(di) in CDH (r = 0.8; p = 0.009). Oesophageal EMG and magnetic stimulation of the phrenic nerves can be useful to assess phrenic nerve function in infants. Reduced phrenic nerve conduction accompanies the reduced diaphragm force production observed in infants with CDH.
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Affiliation(s)
- Z Kassim
- Division of Asthma, Allergy and Lung Biology, King's College, London, UK
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Reilly C, Ward K, Jolley C, Lunt A, Elston C, Rafferty G, Moxham J. Breathlessness during exercise in cystic fibrosis. J Cyst Fibros 2010. [DOI: 10.1016/s1569-1993(10)60264-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Abstract
Breathlessness is a common symptom in respiratory, cardiovascular and malignant disease. It reduces exercise tolerance and mobility, and is an important determinant of quality of life. The multifactorial nature of the symptom often presents difficulties in understanding why individual patients are breathless, and how breathlessness should best be palliated, especially in advanced disease. However, insights into the neurophysiological factors underlying the symptom can be gained by considering the balance between the load on, and capacity of, the respiratory muscles and increased neural respiratory drive, reflecting increased respiratory effort. Mismatch between efferent neural respiratory drive and afferent feedback, reflecting the degree of neuromechanical dissociation, is also important. This paper describes mechanisms by which ventilatory load, capacity and drive may be affected by disease, and how these can be measured physiologically. The schema presented also provides a framework for understanding the mechanisms by which interventions that relieve breathlessness may have their effect.
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Luo Y, Qiu Z, Wu H, Steier J, Jolley C, Zhong N, Moxham J, Polkey M. Neural drive during continuous positive airway pressure (CPAP) and pressure relief CPAP. Sleep Med 2009; 10:731-8. [DOI: 10.1016/j.sleep.2008.06.012] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/21/2008] [Revised: 06/07/2008] [Accepted: 06/09/2008] [Indexed: 10/21/2022]
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Dorman S, Jolley C, Abernethy A, Currow D, Johnson M, Farquhar M, Griffiths G, Peel T, Moosavi S, Byrne A, Wilcock A, Alloway L, Bausewein C, Higginson I, Booth S. Researching breathlessness in palliative care: consensus statement of the National Cancer Research Institute Palliative Care Breathlessness Subgroup. Palliat Med 2009; 23:213-27. [PMID: 19251835 DOI: 10.1177/0269216309102520] [Citation(s) in RCA: 78] [Impact Index Per Article: 5.2] [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: 11/16/2022]
Abstract
Breathlessness is common in advanced disease and can have a devastating impact on patients and carers. Research on the management of breathlessness is challenging. There are relatively few studies, and many studies are limited by inadequate power or design. This paper represents a consensus statement of the National Cancer Research Institute Palliative Care Breathlessness Subgroup. The aims of this paper are to facilitate the design of adequately powered multi-centre interventional studies in breathlessness, to suggest a standardised, rational approach to breathlessness research and to aid future 'between study' comparisons. Discussion of the physiology of breathlessness is included.
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Affiliation(s)
- S Dorman
- Poole Hospital NHS Foundation Trust, Longfleet Road, Poole.
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Steier J, Seymour J, Rafferty G, Jolley C, Luo Y, Polkey M, Moxham J. Transkutane elektrische Stimulation des Musculus Genioglossus in obstruktiver Schlafapnoe. Pneumologie 2009. [DOI: 10.1055/s-0029-1213958] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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31
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Moore J, Fiddler H, Seymour J, Grant A, Jolley C, Johnson L, Moxham J. Effect of a home exercise video programme in patients with chronic obstructive pulmonary disease. J Rehabil Med 2009; 41:195-200. [PMID: 19229454 DOI: 10.2340/16501977-0308] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
OBJECTIVE This pilot study investigated whether a home exercise video programme could improve exercise tolerance and breathlessness in patients with moderate to severe chronic obstructive pulmonary disease. METHODS Twenty subjects completed the study after being randomized to intervention or control. The intervention group (n=10), watched a 19-min video on the benefits of exercise for patients with chronic obstructive pulmonary disease and were given a 30-min exercise video, an illustrated exercise diary and an educational booklet about chronic obstructive pulmonary disease, for use at home. They were advised to follow the exercise video programme 4 times a week for 6 weeks. The control group (n=10) received the chronic obstructive pulmonary disease educational booklet only. Exercise tolerance was measured using the Incremental Shuttle Walk Test and breathlessness by the self-reported Chronic Respiratory Questionnaire. RESULTS The median change in the Incremental Shuttle Walk Test and breathlessness score significantly improved in the intervention group compared with the control (+45 m vs -15 m, p=0.013 and +0.5 vs -0.1 Chronic Respiratory Questionnaire units, p=0.042). The other findings for the self-reported Chronic Respiratory Questionnaire showed significant improvements in the intervention group for emotion (p<0.001) and fatigue (p=0.012), but not mastery (p=0.253). CONCLUSION This pilot study suggests that participation in a home exercise video programme may benefit people with chronic obstructive pulmonary disease.
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Affiliation(s)
- Julie Moore
- Pulmonary Rehabilitation Team, Dulwich Hospital, King's College Hospital NHS Foundation Trust and Lambeth & Southwark Primary Care Trusts, London, UK.
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32
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Luo YM, Tang J, Jolley C, Steier J, Zhong NS, Moxham J, Polkey MI. Distinguishing obstructive from central sleep apnea events: diaphragm electromyogram and esophageal pressure compared. Chest 2009; 135:1133-1141. [PMID: 19118271 DOI: 10.1378/chest.08-1695] [Citation(s) in RCA: 61] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/01/2022] Open
Abstract
BACKGROUND Distinguishing central sleep apnea (CSA) from obstructive sleep apnea (OSA) can be clinically important because different types of apnea may require different treatment approaches. Academically, this distinction is important for investigating the pathological mechanism of different types of sleep apnea. Conventional polysomnography (PSG) with recording of chest and abdominal movement may overestimate the frequency of CSA, leading to inappropriate treatment of sleep-disordered breathing. We hypothesized that diaphragm electromyogram (EMGdi) could be a useful technique to assess neural respiratory drive and respiratory effort and, therefore, to distinguish accurately CSA from OSA. METHODS A multipair esophageal electrode catheter mounted with a balloon was used to record the EMGdi and esophageal pressure (Pes) during overnight PSG. Nineteen patients were included in the study, 12 of whom had previously been identified as having central apnea-hypopnea on a diagnostic PSG undertaken for symptoms that suggest OSA and 7 of whom were known to have heart failure. RESULTS A good relationship was found between the swing of Pes and the root mean (+/- SD) square of the EMGdi during OSA events (0.89 +/- 0.10). About one third of CSA events diagnosed by uncalibrated respiratory inductance plethysmography could not be confirmed by Pes or EMGdi. No difference was found in the number of CSAs diagnosed by Pes (1,319) vs EMGdi (1,293; p > 0.01). CONCLUSIONS We conclude that both Pes and EMGdi measurements are useful in accurately differentiating central from obstructive respiratory events. Conventional PSG with recording of chest and abdominal movement overestimates the frequency of CSA events.
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Affiliation(s)
- Yuan-Ming Luo
- Guangzhou Medical College, State Key Laboratory of Respiratory Disease, Guangzhou, People's Republic of China.
| | - Jing Tang
- Guangzhou Medical College, State Key Laboratory of Respiratory Disease, Guangzhou, People's Republic of China
| | | | | | - Nan-Shan Zhong
- Guangzhou Medical College, State Key Laboratory of Respiratory Disease, Guangzhou, People's Republic of China
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Steier J, Jolley C, Seymour J, Ward K, Lunt A, Polkey M, Moxham J. Der Einfluss von Sitzen und Liegen auf Atemantrieb und Atemmechanik. Pneumologie 2008. [DOI: 10.1055/s-2008-1074395] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Luo YM, Wu HD, Tang J, Jolley C, Steier J, Moxham J, Zhong NS, Polkey MI. Neural respiratory drive during apnoeic events in obstructive sleep apnoea. Eur Respir J 2008; 31:650-7. [DOI: 10.1183/09031936.00049907] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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Steier J, Kaul S, Seymour J, Jolley C, Rafferty G, Man W, Luo YM, Roughton M, Polkey MI, Moxham J. The value of multiple tests of respiratory muscle strength. Thorax 2007; 62:975-80. [PMID: 17557772 PMCID: PMC2117126 DOI: 10.1136/thx.2006.072884] [Citation(s) in RCA: 158] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
BACKGROUND Respiratory muscle weakness is an important clinical problem. Tests of varying complexity and invasiveness are available to assess respiratory muscle strength. The relative precision of different tests in the detection of weakness is less clear, as is the value of multiple tests. METHODS The respiratory muscle function tests of clinical referrals who had multiple tests assessed in our laboratories over a 6-year period were analysed. Thresholds for weakness for each test were determined from published and in-house laboratory data. The patients were divided into three groups: those who had all relevant measurements of global inspiratory muscle strength (group A, n = 182), those with full assessment of diaphragm strength (group B, n = 264) and those for whom expiratory muscle strength was fully evaluated (group C, n = 60). The diagnostic outcome of each inspiratory, diaphragm and expiratory muscle test, both singly and in combination, was studied and the impact of using more than one test to detect weakness was calculated. RESULTS The clinical referrals were primarily for the evaluation of neuromuscular diseases and dyspnoea of unknown cause. A low maximal inspiratory mouth pressure (Pimax) was recorded in 40.1% of referrals in group A, while a low sniff nasal pressure (Sniff Pnasal) was recorded in 41.8% and a low sniff oesophageal pressure (Sniff Poes) in 37.9%. When assessing inspiratory strength with the combination of all three tests, 29.6% of patients had weakness. Using the two non-invasive tests (Pimax and Sniff Pnasal) in combination, a similar result was obtained (low in 32.4%). Combining Sniff Pdi (low in 68.2%) and Twitch Pdi (low in 67.4%) reduced the diagnoses of patients with diaphragm weakness to 55.3% in group B. 38.3% of the patients in group C had expiratory muscle weakness as measured by maximum expiratory pressure (Pemax) compared with 36.7% when weakness was diagnosed by cough gastric pressure (Pgas), and 28.3% when assessed by Twitch T10. Combining all three expiratory muscle tests reduced the number of patients diagnosed as having expiratory muscle weakness to 16.7%. CONCLUSION The use of single tests such as Pimax, Pemax and other available individual tests of inspiratory, diaphragm and expiratory muscle strength tends to overdiagnose weakness. Combinations of tests increase diagnostic precision and, in the population studied, they reduced the diagnosis of inspiratory, specific diaphragm and expiratory muscle weakness by 19-56%. Measuring both Pimax and Sniff Pnasal resulted in a relative reduction of 19.2% of patients falsely diagnosed with inspiratory muscle weakness. The addition of Twitch Pdi to Sniff Pdi increased diagnostic precision by a smaller amount (18.9%). Having multiple tests of respiratory muscle function available both increases diagnostic precision and makes assessment possible in a range of clinical circumstances.
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Affiliation(s)
- Joerg Steier
- Respiratory Muscle Laboratory, King's College London School of Medicine, King's College Hospital, Denmark Hill, London SE5 9PJ, UK.
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Steier J, Kaul S, Seymour J, Jolley C, Man W, Rafferty G, Luo Y, Polkey M, Moxham J. Der Wert einer Kombination von Atemmuskeltests. Pneumologie 2007. [DOI: 10.1055/s-2007-973240] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Abstract
Gastrointestinal bleeding in Turner's syndrome can represent vascular lesions that are frequently beyond standard endoscopic reach and often life threatening. This report describes the successful use of intraoperative endoscopy to identify the souce of bleeding in an adolescent with Turner's syndrome and significant intestinal hemorrhage. J Pediatr Surg 36:951-952.
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Affiliation(s)
- C Jolley
- Department of Pediatrics, University of Florida, Gainesville, FL 32610-0296, USA
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38
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Zochodne DW, Verge VM, Cheng C, Höke A, Jolley C, Thomsen K, Rubin I, Lauritzen M. Nitric oxide synthase activity and expression in experimental diabetic neuropathy. J Neuropathol Exp Neurol 2000; 59:798-807. [PMID: 11005260 DOI: 10.1093/jnen/59.9.798] [Citation(s) in RCA: 45] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
The changes of nitric oxide synthase (NOS) activity and expression in experimental diabetic neuropathy have not been examined. Increases in ganglia NOS might be similar to those that follow axotomy, whereas declines in endothelial NOS (eNOS) and immunological NOS (iNOS) might explain dysfunction of microvessels or macrophages. In this work, we studied NOS activity in lumbar dorsal root ganglia (DRG) of rats with both short- and long-term experimental streptozotocin-induced diabetes and correlated it with expression of each of the 3 NOS isoforms. NOS enzymatic activity in DRG increased after 12 months of diabetes. This increase, however, was not accompanied by an increase in neuronal NOS immunohistochemistry or mRNA. Immunohistochemical and RT-PCR studies did not identify changes of eNOS expression in 12-month sciatic nerves or DRG from diabetics. Two-month diabetic DRG had increased eNOS mRNA and there was novel eNOS labeling of capsular DRG and perineurial cells. iNOS mRNA levels were lower in diabetics at both time points in peripheral nerves but were unchanged in DRG. Diabetic ganglia showed an increase in NOS activity not explained by novel NOS isoform synthesis. The increases may compensate for NO "quenching" by endproducts of glycosylation. Declines in iNOS may indicate impaired macrophage function.
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Affiliation(s)
- D W Zochodne
- Neuroscience Research Group and the Department of Clinical Neurosciences, University of Calgary, Alberta, Canada
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Jolley C, Burnet FR, Blower PJ. Improved synthesis and characterisation of a hydrazide derivative of diethylenetriaminepentaacetic acid for site-specific labelling of monoclonal antibodies with 111In. Appl Radiat Isot 1996; 47:623-6. [PMID: 8759156 DOI: 10.1016/0969-8043(96)00011-5] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
The monohydrazide derivative of diethylenetriaminepentaacetic acid, (HOOCCH2)2NCH2CH2N(CH2CO-OH)CH2CH2N(CH2COOH++ +)(CH2CO.NHNH2), is a bifunctional chelator designed for attaching the radiometal 111In selectively to the carbohydrate side chains of pre-oxidised monoclonal antibodies. A simple synthesis of this chelator (from diethylenetriaminepentaacetic acid cyclic anhydride and hydrazine), and its purification and chemical characterisation, are described. Rabbit IgG was oxidised with periodate, and the aldehyde groups thus generated were reacted with the linker forming a conjugate that was readily labelled in high yield and purity with 111In.
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Affiliation(s)
- C Jolley
- Biological Laboratory, University of Kent, Canterbury, England
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40
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Harris H, Jolley C, Miller NG. A light-scattering assay for lymphocyte shape and its application to T and B lymphocyte responses to cultured high-walled endothelial cells. J Immunol Methods 1996; 192:179-85. [PMID: 8699015 DOI: 10.1016/0022-1759(96)00050-6] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
Lymphocyte shape changes are detectable as changes in the forward light scatter (FLS) profile of a Becton-Dickinson FACStar flow cytometer, with polar cells giving lower values of FLS. The FACScan cell analyser does not detect these changes. Freshly isolated lymph node lymphocytes are round, but when stimulated, for example by incubation with cultured high endothelial cells (HEC), a proportion change shape and become polar. The FLS profiles of lymphocytes stained for T and B cell surface markers show that both subsets change shape in response to HEC, but in a consistently different manner. Light microscopy of sorted T and B populations indicates that equal proportions of both cell types change shape, but that T cells are more likely to become highly elongated.
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Affiliation(s)
- H Harris
- Department of Immunology, Babraham Institute, Cambridge, UK
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Hubbard RC, McElvaney NG, Birrer P, Shak S, Robinson WW, Jolley C, Wu M, Chernick MS, Crystal RG. A preliminary study of aerosolized recombinant human deoxyribonuclease I in the treatment of cystic fibrosis. N Engl J Med 1992; 326:812-5. [PMID: 1538726 DOI: 10.1056/nejm199203193261207] [Citation(s) in RCA: 158] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Affiliation(s)
- R C Hubbard
- Pulmonary Branch, National Heart, Lung, and Blood Institute, Bethesda, Md. 20892
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Grogan TM, Hicks MJ, Jolley C. Immunologic and cytochemical characterization of lymphoreticular malignancies. Ariz Med 1981; 38:524-8. [PMID: 6168251] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
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