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Tsagkas C, Horvath-Huck A, Haas T, Amann M, Todea A, Altermatt A, Müller J, Cagol A, Leimbacher M, Barakovic M, Weigel M, Pezold S, Sprenger T, Kappos L, Bieri O, Granziera C, Cattin P, Parmar K. Fully Automatic Method for Reliable Spinal Cord Compartment Segmentation in Multiple Sclerosis. AJNR Am J Neuroradiol 2023; 44:218-227. [PMID: 36702504 PMCID: PMC9891337 DOI: 10.3174/ajnr.a7756] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2022] [Accepted: 12/05/2022] [Indexed: 01/27/2023]
Abstract
BACKGROUND AND PURPOSE Fully automatic quantification methods of spinal cord compartments are needed to study pathologic changes of the spinal cord GM and WM in MS in vivo. We propose a novel method for automatic spinal cord compartment segmentation (SCORE) in patients with MS. MATERIALS AND METHODS The cervical spinal cords of 24 patients with MS and 24 sex- and age-matched healthy controls were scanned on a 3T MR imaging system, including an averaged magnetization inversion recovery acquisition sequence. Three experienced raters manually segmented the spinal cord GM and WM, anterior and posterior horns, gray commissure, and MS lesions. Subsequently, manual segmentations were used to train neural segmentation networks of spinal cord compartments with multidimensional gated recurrent units in a 3-fold cross-validation fashion. Total intracranial volumes were quantified using FreeSurfer. RESULTS The intra- and intersession reproducibility of SCORE was high in all spinal cord compartments (eg, mean relative SD of GM and WM: ≤ 3.50% and ≤1.47%, respectively) and was better than manual segmentations (all P < .001). The accuracy of SCORE compared with manual segmentations was excellent, both in healthy controls and in patients with MS (Dice similarity coefficients of GM and WM: ≥ 0.84 and ≥0.92, respectively). Patients with MS had lower total WM areas (P < .05), and total anterior horn areas (P < .01 respectively), as measured with SCORE. CONCLUSIONS We demonstrate a novel, reliable quantification method for spinal cord tissue segmentation in healthy controls and patients with MS and other neurologic disorders affecting the spinal cord. Patients with MS have reduced areas in specific spinal cord tissue compartments, which may be used as MS biomarkers.
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Affiliation(s)
- C Tsagkas
- From the Neurologic Clinic and Policlinic, Departments of Medicine (C.T., M.A., J.M., M.W., T.S., L.K., C.G., K.P.), Clinical Research and Biomedical Engineering
- Translational Imaging in Neurology Basel (C.T., A.T., J.M., A.C., M.B., M.W., C.G., K.P.)
| | - A Horvath-Huck
- Department of Biomedical Engineering (A.H.-H., M.A., A.C., M.B., M.W., S.P., O.B., C.G., P.C.), University of Basel, Allschwil, Switzerland
| | - T Haas
- Department of Medicine and Biomedical Engineering; Division of Radiological Physics (T.H., M.W., O.B.)
| | - M Amann
- From the Neurologic Clinic and Policlinic, Departments of Medicine (C.T., M.A., J.M., M.W., T.S., L.K., C.G., K.P.), Clinical Research and Biomedical Engineering
- Department of Biomedical Engineering (A.H.-H., M.A., A.C., M.B., M.W., S.P., O.B., C.G., P.C.), University of Basel, Allschwil, Switzerland
- Medical Image Analysis Center AG (M.A., A.A.), Basel, Switzerland
| | - A Todea
- Translational Imaging in Neurology Basel (C.T., A.T., J.M., A.C., M.B., M.W., C.G., K.P.)
- Department of Radiology; Department of Neuroradiology (A.T.), Clinic for Radiology & Nuclear Medicine; and Research Center for Clinical Neuroimmunology
| | - A Altermatt
- Medical Image Analysis Center AG (M.A., A.A.), Basel, Switzerland
| | - J Müller
- From the Neurologic Clinic and Policlinic, Departments of Medicine (C.T., M.A., J.M., M.W., T.S., L.K., C.G., K.P.), Clinical Research and Biomedical Engineering
- Translational Imaging in Neurology Basel (C.T., A.T., J.M., A.C., M.B., M.W., C.G., K.P.)
| | - A Cagol
- Translational Imaging in Neurology Basel (C.T., A.T., J.M., A.C., M.B., M.W., C.G., K.P.)
- Department of Biomedical Engineering (A.H.-H., M.A., A.C., M.B., M.W., S.P., O.B., C.G., P.C.), University of Basel, Allschwil, Switzerland
| | - M Leimbacher
- Medical Faculty (M.L., P.C.), University of Basel, Basel, Switzerland
| | - M Barakovic
- Translational Imaging in Neurology Basel (C.T., A.T., J.M., A.C., M.B., M.W., C.G., K.P.)
- Department of Biomedical Engineering (A.H.-H., M.A., A.C., M.B., M.W., S.P., O.B., C.G., P.C.), University of Basel, Allschwil, Switzerland
| | - M Weigel
- From the Neurologic Clinic and Policlinic, Departments of Medicine (C.T., M.A., J.M., M.W., T.S., L.K., C.G., K.P.), Clinical Research and Biomedical Engineering
- Translational Imaging in Neurology Basel (C.T., A.T., J.M., A.C., M.B., M.W., C.G., K.P.)
- Department of Medicine and Biomedical Engineering; Division of Radiological Physics (T.H., M.W., O.B.)
- Department of Biomedical Engineering (A.H.-H., M.A., A.C., M.B., M.W., S.P., O.B., C.G., P.C.), University of Basel, Allschwil, Switzerland
| | - S Pezold
- Department of Biomedical Engineering (A.H.-H., M.A., A.C., M.B., M.W., S.P., O.B., C.G., P.C.), University of Basel, Allschwil, Switzerland
| | - T Sprenger
- From the Neurologic Clinic and Policlinic, Departments of Medicine (C.T., M.A., J.M., M.W., T.S., L.K., C.G., K.P.), Clinical Research and Biomedical Engineering
- Department of Neurology (T.S.), DKD Helios Klinik Wiesbaden, Wiesbaden, Germany
| | - L Kappos
- From the Neurologic Clinic and Policlinic, Departments of Medicine (C.T., M.A., J.M., M.W., T.S., L.K., C.G., K.P.), Clinical Research and Biomedical Engineering
- Neuroscience Basel (RC2NB) (L.K.), Departments of Medicine, Clinical Research, and Biomedical Imaging, University Hospital Basel and University of Basel, Basel, Switzerland
| | - O Bieri
- Department of Medicine and Biomedical Engineering; Division of Radiological Physics (T.H., M.W., O.B.)
- Department of Biomedical Engineering (A.H.-H., M.A., A.C., M.B., M.W., S.P., O.B., C.G., P.C.), University of Basel, Allschwil, Switzerland
| | - C Granziera
- From the Neurologic Clinic and Policlinic, Departments of Medicine (C.T., M.A., J.M., M.W., T.S., L.K., C.G., K.P.), Clinical Research and Biomedical Engineering
- Translational Imaging in Neurology Basel (C.T., A.T., J.M., A.C., M.B., M.W., C.G., K.P.)
- Department of Biomedical Engineering (A.H.-H., M.A., A.C., M.B., M.W., S.P., O.B., C.G., P.C.), University of Basel, Allschwil, Switzerland
| | - P Cattin
- Department of Biomedical Engineering (A.H.-H., M.A., A.C., M.B., M.W., S.P., O.B., C.G., P.C.), University of Basel, Allschwil, Switzerland
- Medical Faculty (M.L., P.C.), University of Basel, Basel, Switzerland
| | - K Parmar
- From the Neurologic Clinic and Policlinic, Departments of Medicine (C.T., M.A., J.M., M.W., T.S., L.K., C.G., K.P.), Clinical Research and Biomedical Engineering
- Translational Imaging in Neurology Basel (C.T., A.T., J.M., A.C., M.B., M.W., C.G., K.P.)
- Reha Rheinfelden (K.P.), Rheinfelden, Switzerland
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Tendobi C, Fernandez-Marques M, Carlos S, Amann M, Ndaye M, Ngoya L, Segura G, Nuñez L, Oliver D, Oiz I, Tshilanda M, Lozano D, Auba M, Caparros M, Reina G, Mbuyi D, Iglesias-Fernandez P, Zinga B, Jurado M, Chiva L. Validation of a sustainable internationally monitored cervical cancer screening system using a visual smartphone inspection in Kinshasa, Democratic Republic of Congo. Int J Gynecol Cancer 2022; 32:ijgc-2022-003592. [PMID: 35858712 DOI: 10.1136/ijgc-2022-003592] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
Abstract
OBJECTIVE To determine the sensitivity, specificity, and positive and negative predictive values of a cervical cancer screening program based on visual inspection with acetic acid and Lugol's iodine using a smartphone in a sub-urban area of very low resources in Kinshasa (Democratic Republic of Congo). METHODS This cross-sectional validation study was conducted at Monkole Hospital and it included women between the ages of 25-70 years after announcing a free cervical cancer screening campaign through posters placed in the region of our hospital. Questionnaires collected sociodemographic and behavioral patients characteristics. In the first consultation, we gathered liquid-based cytology samples from every woman. At that time, local health providers performed two combined visual inspection techniques (5% acetic acid and Lugol's iodine) while a photograph was taken with a smartphone. Two international specialists evaluated the results of the smartphone cervicography. When a visual inspection was considered suspicious, patients were offered immediate cryotherapy. Cytological samples were sent to the Pathology Department of the University of Navarra for cytological assessment and human papillomavirus (HPV) DNA genotyping. RESULTS A total of 480 women participated in the study. The mean age was 44.6 years (range 25-65). Of all the patients, only 18.7% were infected with HPV (75% had high-risk genotypes). The most frequent high-risk genotype found was 16 (12.2%). The majority (88%) of women had normal cytology. After comparing combined visual inspection results with cytology, we found a sensitivity of 66.0%, a specificity of 87.8%, a positive predictive value of 40.7%, and a negative predictive value of 95.3% for any cytological lesion. The negative predictive value for high-grade lesions was 99.7%. CONCLUSIONS Cervical cancer screening through combined visual inspection, conducted by non-specialized personnel and monitored by experts through smartphones, shows encouraging results, ruling out high-grade cytological lesions in most cases. This combined visual inspection test is a valid and affordable method for screening programs in low-income areas.
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Affiliation(s)
- Celine Tendobi
- Obstetrics and Gynecology, Hospital Monkole, Kinshasa, Congo (the Democratic Republic of the)
| | | | - Silvia Carlos
- Preventive Medicine and Public Health Department, IdiSNA, Navarra Institute for Health Research, Universidad de Navarra, Pamplona, Spain
| | - Marta Amann
- University of Navarra - Academic Campus, Pamplona, Spain
| | - Milva Ndaye
- Medical office Évry the 2 hands, Évry, France
| | - Laetitia Ngoya
- Obstetrics and Gynecology, Hospital Monkole, Kinshasa, Congo (the Democratic Republic of the)
| | - Gloria Segura
- University of Navarra - Academic Campus, Pamplona, Spain
| | - Laura Nuñez
- University of Navarra - Academic Campus, Pamplona, Spain
| | - David Oliver
- University of Navarra - Academic Campus, Pamplona, Spain
| | - Itz Oiz
- University of Navarra - Academic Campus, Pamplona, Spain
| | - Marc Tshilanda
- Internal Medicine, Hospital Monkole, Kinshasa, Congo (the Democratic Republic of the)
| | - Dolores Lozano
- Pathology, Clinica Universidad de Navarra, Pamplona, Spain
| | - Maria Auba
- Obstetrics and Gynecology, Clinica Universidad de Navarra, Pamplona, Spain
| | - Maria Caparros
- Obstetrics and Gynecology, Clinica Universidad de Navarra, Pamplona, Spain
| | - Gabriel Reina
- Microbiology, IdiSNA, Navarra Institute for Health Research, Clinica Universidad de Navarra, Pamplona, Spain
| | - Didier Mbuyi
- Biomedical Research Unit, Hospital Monkole, Kinshasa, Congo (the Democratic Republic of the)
| | | | - Berthe Zinga
- Obstetrics and Gynecology, University of Kinshasa Faculty of Medicine, Kinshasa, Congo (the Democratic Republic of the)
| | - Matias Jurado
- Gynecology, Clinica Universitaria de Navarra, Pamplona, Spain
- Universidad de Navarra, Pamplona, Spain
| | - Luis Chiva
- Obstetrics and Gynecology, Clinica Universidad de Navarra, Pamplona, Spain
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Seiler A, Schettle M, Amann M, Gaertner S, Wicki S, Christ SM, Theile G, Feuz M, Hertler C, Blum D. Virtual Reality Therapy in Palliative Care: A Case Series. J Palliat Care 2022:8258597221086767. [PMID: 35293818 DOI: 10.1177/08258597221086767] [Citation(s) in RCA: 4] [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] [Indexed: 11/16/2022]
Abstract
OBJECTIVES Virtual reality (VR) opens a variety of therapeutic options to improve symptom burden in patients with advanced disease. Until to date, only few studies have evaluated the use of VR therapy in the context of palliative care. This case series aims to evaluate the feasibility and acceptability of VR therapy in a population of palliative care patients. METHODS In this single-site case series, we report on six palliative care patients undergoing VR therapy. The VR therapy consisted of a one-time session ranging between 20 to 60 minutes depending on the patient's needs and the content chosen for the VR sessions. A semi-structured survey was conducted and the Edmonton Symptom Assessment System (ESAS) and the Distress Thermometer were performed pre- and post-intervention. RESULTS Overall, VR therapy was well accepted by all patients. Five out of six patients reported having appreciated VR therapy. There were individual differences of perceived effects using VR therapy. The semi-structured survey revealed that some patients felt a temporary detachment from their body and that patients were able to experience the VR session as a break from omnipresent worries and the hospital environment ("I completely forgot where I am"). There was a considerable reduction in the total ESAS score post-treatment (T0 ESASTot = 27.2; T1 ESASTot = 18.8) and a slightly reduction in distress (T0 DTTot = 4.4; T1 DTTot = 3.8). However, two patients were more tired after the intervention.Significance of Results: Our preliminary results demonstrate that VR therapy is acceptable, feasible and safe for use within a palliative care population and appears to be a viable treatment option. Clinical trials are both warranted and necessary to confirm any therapeutic effects of VR therapy, as is the need to tailor VR systems better for use in palliative care settings.
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Affiliation(s)
- A Seiler
- Department of Radiation Oncology, Competence Center Palliative Care, University Hospital Zurich, Zurich, Switzerland
- Department of Consultation-Liaison Psychiatry and Psychosomatic Medicine, University Hospital Zurich and University of Zurich, Zurich, Switzerland
| | - M Schettle
- Department of Radiation Oncology, Competence Center Palliative Care, University Hospital Zurich, Zurich, Switzerland
| | - M Amann
- Department of Radiation Oncology, Competence Center Palliative Care, University Hospital Zurich, Zurich, Switzerland
| | - Sophie Gaertner
- Department of Radiation Oncology, Competence Center Palliative Care, University Hospital Zurich, Zurich, Switzerland
| | - Stefan Wicki
- Department of Radiation Oncology, Competence Center Palliative Care, University Hospital Zurich, Zurich, Switzerland
- Internal Medicine Centre, Hirslanden Klinik Aarau, Switzerland
| | - S M Christ
- Department of Radiation Oncology, Competence Center Palliative Care, University Hospital Zurich, Zurich, Switzerland
| | - G Theile
- Clinic Susenberg, Zurich, Switzerland
| | - M Feuz
- Department of Radiation Oncology, Competence Center Palliative Care, University Hospital Zurich, Zurich, Switzerland
| | - C Hertler
- Department of Radiation Oncology, Competence Center Palliative Care, University Hospital Zurich, Zurich, Switzerland
| | - D Blum
- Department of Radiation Oncology, Competence Center Palliative Care, University Hospital Zurich, Zurich, Switzerland
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Weavil JC, Thurston TS, Hureau TJ, Gifford JR, Kithas PA, Broxterman RM, Bledsoe AD, Nativi JN, Richardson RS, Amann M. Heart failure with preserved ejection fraction diminishes peripheral hemodynamics and accelerates exercise-induced neuromuscular fatigue. Am J Physiol Heart Circ Physiol 2020; 320:H338-H351. [PMID: 33164549 DOI: 10.1152/ajpheart.00266.2020] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
This study investigated the impact of HFpEF on neuromuscular fatigue and peripheral hemodynamics during small muscle mass exercise not limited by cardiac output. Eight HFpEF patients (NYHA II-III, ejection-fraction: 61 ± 2%) and eight healthy controls performed dynamic knee extension exercise (80% peak workload) to task failure and maximal intermittent quadriceps contractions (8 × 15 s). Controls repeated knee extension at the same absolute intensity as HFpEF. Leg blood flow (QL) was quantified using Doppler ultrasound. Pre/postexercise changes in quadriceps twitch torque (ΔQtw; peripheral fatigue), voluntary activation (ΔVA; central fatigue), and corticospinal excitability were quantified. At the same relative intensity, HFpEF (24 ± 5 W) and controls (42 ± 6 W) had a similar time-to-task failure (∼10 min), ΔQtw (∼50%), and ΔVA (∼6%). This resulted in a greater exercise-induced change in neuromuscular function per unit work in HFpEF, which was significantly correlated with a slower QL response time. Knee extension exercise at the same absolute intensity resulted in an ∼40% lower QL and greater ΔQtw and ΔVA in HFpEF than in controls. Corticospinal excitability remained unaltered during exercise in both groups. Finally, despite a similar ΔVA, ΔQtw was larger in HFpEF versus controls during isometric exercise. In conclusion, HFpEF patients are characterized by a similar development of central and peripheral fatigue as healthy controls when tested at the same relative intensity during exercise not limited by cardiac output. However, HFpEF patients have a greater susceptibility to neuromuscular fatigue during exercise at a given absolute intensity, and this impairs functional capacity. The patients' compromised QL response to exercise likely accounts, at least partly, for the patients' attenuated fatigue resistance.NEW & NOTEWORTHY The susceptibility to neuromuscular fatigue during exercise is substantially exaggerated in individuals with heart failure with a preserved ejection fraction. The faster rate of fatigue development is associated with the compromised peripheral hemodynamic response characterizing these patients during exercise. Given the role of neuromuscular fatigue as a factor limiting exercise, this impairment likely accounts for a significant portion of the exercise intolerance typical for this population.
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Affiliation(s)
- J C Weavil
- Geriatric Research, Education, and Clinical Center, Veterans Affairs Medical Center, Salt Lake City, Utah.,Department of Internal Medicine, University of Utah, Salt Lake City, Utah
| | - T S Thurston
- Department of Nutrition and Integrative Physiology, University of Utah, Salt Lake City, Utah
| | - T J Hureau
- Department of Internal Medicine, University of Utah, Salt Lake City, Utah
| | - J R Gifford
- Department of Internal Medicine, University of Utah, Salt Lake City, Utah
| | - P A Kithas
- Geriatric Research, Education, and Clinical Center, Veterans Affairs Medical Center, Salt Lake City, Utah.,Department of Internal Medicine, University of Utah, Salt Lake City, Utah
| | - R M Broxterman
- Department of Internal Medicine, University of Utah, Salt Lake City, Utah
| | - A D Bledsoe
- Department of Anesthesiology, University of Utah, Salt Lake City, Utah
| | - J N Nativi
- Department of Internal Medicine, University of Utah, Salt Lake City, Utah
| | - R S Richardson
- Geriatric Research, Education, and Clinical Center, Veterans Affairs Medical Center, Salt Lake City, Utah.,Department of Internal Medicine, University of Utah, Salt Lake City, Utah.,Department of Nutrition and Integrative Physiology, University of Utah, Salt Lake City, Utah
| | - M Amann
- Geriatric Research, Education, and Clinical Center, Veterans Affairs Medical Center, Salt Lake City, Utah.,Department of Internal Medicine, University of Utah, Salt Lake City, Utah.,Department of Nutrition and Integrative Physiology, University of Utah, Salt Lake City, Utah.,Department of Anesthesiology, University of Utah, Salt Lake City, Utah
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5
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Tsagkas C, Horvath A, Altermatt A, Pezold S, Weigel M, Haas T, Amann M, Kappos L, Sprenger T, Bieri O, Cattin P, Parmar K. Automatic Spinal Cord Gray Matter Quantification: A Novel Approach. AJNR Am J Neuroradiol 2019; 40:1592-1600. [PMID: 31439628 DOI: 10.3174/ajnr.a6157] [Citation(s) in RCA: 4] [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] [Subscribe] [Scholar Register] [Received: 11/26/2018] [Accepted: 06/25/2019] [Indexed: 12/12/2022]
Abstract
BACKGROUND AND PURPOSE Currently, accurate and reproducible spinal cord GM segmentation remains challenging and a noninvasive broadly accepted reference standard for spinal cord GM measurements is still a matter of ongoing discussion. Our aim was to assess the reproducibility and accuracy of cervical spinal cord GM and WM cross-sectional area measurements using averaged magnetization inversion recovery acquisitions images and a fully-automatic postprocessing segmentation algorithm. MATERIALS AND METHODS The cervical spinal cord of 24 healthy subjects (14 women; mean age, 40 ± 11 years) was scanned in a test-retest fashion on a 3T MR imaging system. Twelve axial averaged magnetization inversion recovery acquisitions slices were acquired over a 48-mm cord segment. GM and WM were both manually segmented by 2 experienced readers and compared with an automatic variational segmentation algorithm with a shape prior modified for 3D data with a slice similarity prior. Precision and accuracy of the automatic method were evaluated using coefficients of variation and Dice similarity coefficients. RESULTS The mean GM area was 17.20 ± 2.28 mm2 and the mean WM area was 72.71 ± 7.55 mm2 using the automatic method. Reproducibility was high for both methods, while being better for the automatic approach (all mean automatic coefficients of variation, ≤4.77%; all differences, P < .001). The accuracy of the automatic method compared with the manual reference standard was excellent (mean Dice similarity coefficients: 0.86 ± 0.04 for GM and 0.90 ± 0.03 for WM). The automatic approach demonstrated similar coefficients of variation between intra- and intersession reproducibility as well as among all acquired spinal cord slices. CONCLUSIONS Our novel approach including the averaged magnetization inversion recovery acquisitions sequence and a fully-automated postprocessing segmentation algorithm demonstrated an accurate and reproducible spinal cord GM and WM segmentation. This pipeline is promising for both the exploration of longitudinal structural GM changes and application in clinical settings in disorders affecting the spinal cord.
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Affiliation(s)
- C Tsagkas
- From the Neurologic Clinic and Policlinic (C.T., M.A., L.K., T.S., K.P.), Department of Medicine and Biomedical Engineering.,Translational Imaging in Neurology Basel (C.T., A.A., M.A., M.W., L.K., K.P.), Department of Medicine and Biomedical Engineering.,Medical Image Analysis Center (C.T., A.A., M.A.), Basel, Switzerland
| | - A Horvath
- Department of Biomedical Engineering (A.H., A.A., S.P., M.W., O.B., P.C.), University of Basel, Allschwil, Switzerland
| | - A Altermatt
- Translational Imaging in Neurology Basel (C.T., A.A., M.A., M.W., L.K., K.P.), Department of Medicine and Biomedical Engineering.,Medical Image Analysis Center (C.T., A.A., M.A.), Basel, Switzerland.,Department of Biomedical Engineering (A.H., A.A., S.P., M.W., O.B., P.C.), University of Basel, Allschwil, Switzerland
| | - S Pezold
- Department of Biomedical Engineering (A.H., A.A., S.P., M.W., O.B., P.C.), University of Basel, Allschwil, Switzerland
| | - M Weigel
- Translational Imaging in Neurology Basel (C.T., A.A., M.A., M.W., L.K., K.P.), Department of Medicine and Biomedical Engineering.,Division of Radiological Physics (M.W., T.H., O.B.), Department of Radiology.,Department of Biomedical Engineering (A.H., A.A., S.P., M.W., O.B., P.C.), University of Basel, Allschwil, Switzerland
| | - T Haas
- Division of Radiological Physics (M.W., T.H., O.B.), Department of Radiology
| | - M Amann
- From the Neurologic Clinic and Policlinic (C.T., M.A., L.K., T.S., K.P.), Department of Medicine and Biomedical Engineering.,Translational Imaging in Neurology Basel (C.T., A.A., M.A., M.W., L.K., K.P.), Department of Medicine and Biomedical Engineering.,Division of Diagnostic and Interventional Neuroradiology (M.A.), Department of Radiology, University Hospital Basel, University of Basel, Basel, Switzerland.,Medical Image Analysis Center (C.T., A.A., M.A.), Basel, Switzerland
| | - L Kappos
- From the Neurologic Clinic and Policlinic (C.T., M.A., L.K., T.S., K.P.), Department of Medicine and Biomedical Engineering.,Translational Imaging in Neurology Basel (C.T., A.A., M.A., M.W., L.K., K.P.), Department of Medicine and Biomedical Engineering
| | - T Sprenger
- From the Neurologic Clinic and Policlinic (C.T., M.A., L.K., T.S., K.P.), Department of Medicine and Biomedical Engineering.,Department of Neurology (T.S.), DKD HELIOS Klinik, Wiesbaden, Germany
| | - O Bieri
- Division of Radiological Physics (M.W., T.H., O.B.), Department of Radiology.,Department of Biomedical Engineering (A.H., A.A., S.P., M.W., O.B., P.C.), University of Basel, Allschwil, Switzerland
| | - P Cattin
- Department of Biomedical Engineering (A.H., A.A., S.P., M.W., O.B., P.C.), University of Basel, Allschwil, Switzerland
| | - K Parmar
- From the Neurologic Clinic and Policlinic (C.T., M.A., L.K., T.S., K.P.), Department of Medicine and Biomedical Engineering .,Translational Imaging in Neurology Basel (C.T., A.A., M.A., M.W., L.K., K.P.), Department of Medicine and Biomedical Engineering
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Yushchenko M, Sarracanie M, Amann M, Sinkus R, Wuerfel J, Salameh N. Remote palpation of the human brain with magnetic resonance imaging: protocol optimization for the study of glioblastoma. Comput Methods Biomech Biomed Engin 2019. [DOI: 10.1080/10255842.2020.1714939] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Affiliation(s)
- M. Yushchenko
- Department of Biomedical Engineering, University of Basel, Allschwil, Switzerland
| | - M. Sarracanie
- Department of Biomedical Engineering, University of Basel, Allschwil, Switzerland
- Medical Image Analysis Center (MIAC) AG, Basel, Switzerland
| | - M. Amann
- Department of Biomedical Engineering, University of Basel, Allschwil, Switzerland
- Medical Image Analysis Center (MIAC) AG, Basel, Switzerland
| | - R. Sinkus
- Laboratory for Vascular Translational Science (LVTS), U1148, INSERM, Paris, France
| | - J. Wuerfel
- Department of Biomedical Engineering, University of Basel, Allschwil, Switzerland
- Medical Image Analysis Center (MIAC) AG, Basel, Switzerland
| | - N. Salameh
- Department of Biomedical Engineering, University of Basel, Allschwil, Switzerland
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7
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Shindell D, Borgford-Parnell N, Brauer M, Haines A, Kuylenstierna JCI, Leonard SA, Ramanathan V, Ravishankara A, Amann M, Srivastava L. A climate policy pathway for near- and long-term benefits. Science 2018; 356:493-494. [PMID: 28473553 DOI: 10.1126/science.aak9521] [Citation(s) in RCA: 74] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Affiliation(s)
- D Shindell
- Nicholas School of the Environment, Duke University, Durham, NC 27708, USA.
| | - N Borgford-Parnell
- Institute for Governance and Sustainable Development, Washington, DC 20008, USA
| | - M Brauer
- School of Population and Public Health, The University of British Columbia, Vancouver, British Columbia V6T 1Z3, Canada
| | - A Haines
- London School of Hygiene and Tropical Medicine, London WCIH 9SH, UK
| | | | - S A Leonard
- United Nations Environment Programme, 75015 Paris, France
| | - V Ramanathan
- Scripps Institution of Oceanography, University of California at San Diego, La Jolla, CA 92093, USA
| | | | - M Amann
- International Institute for Applied Systems Analysis, Laxenburg, A-2361 Austria
| | - L Srivastava
- TERI University, Vasant Kunj, New Delhi 110 070, India
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Hochholzer W, Stratz C, Kleiner P, Younas I, Valina C, Loeffelhardt N, Amann M, Ferenc M, Trenk D, Neumann F. 3108Antiplatelet effects of oral P2Y12-receptor inhibitor loading strategies for transitioning from cangrelor. Eur Heart J 2017. [DOI: 10.1093/eurheartj/ehx504.3108] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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9
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Hoeppli M, Thurston T, Sidhu S, Mangum T, Weavil J, Hureau T, Tang W, Hughen R, Light A, Amann M, Schweinhardt P. (352) Differences in psychophysical responses to muscle stimulation in young and old healthy adults. The Journal of Pain 2016. [DOI: 10.1016/j.jpain.2016.01.259] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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10
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Yaldizli Ö, Penner IK, Yonekawa T, Naegelin Y, Kuhle J, Pardini M, Chard DT, Stippich C, Kira JI, Bendfeldt K, Amann M, Radue EW, Kappos L, Sprenger T. The association between olfactory bulb volume, cognitive dysfunction, physical disability and depression in multiple sclerosis. Eur J Neurol 2015; 23:510-9. [PMID: 26699999 DOI: 10.1111/ene.12891] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.0] [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: 12/22/2014] [Accepted: 08/04/2015] [Indexed: 01/20/2023]
Abstract
BACKGROUND AND PURPOSE Olfactory bulb atrophy is associated with cognitive dysfunction in Parkinson's and Alzheimer's disease, and with major depression. It has been suggested that olfactory bulb atrophy or dysfunction is therefore a marker of neurodegeneration. Multiple sclerosis (MS) is now also recognized as having a significant neurodegenerative component. Thus, the aim of this study was to investigate associations between physical and cognitive disability, depression and olfactory bulb volume in MS. METHODS In total, 146 patients with MS (mean age 49.0 ± 10.9 years, disease duration 21.2 ± 9.3 years, median Expanded Disability Status Scale (EDSS) score 3.0 (range 0-7.5), 103 relapsing-remitting, 35 secondary progressive and eight primary progressive MS) underwent a standardized neurological examination, comprehensive neuropsychological testing and magnetic resonance imaging (MRI); data of 27 healthy people served as age- and gender-matched control subjects. The olfactory bulb was semi-automatically segmented on high-resolution three-dimensional T1-weighted MRI. RESULTS Mean olfactory bulb volume was lower in MS patients than healthy controls (183.9 ± 40.1 vs. 209.2 ± 59.3 μl; P = 0.018 adjusted to intracranial volume). Olfactory bulb volume was similar across clinical disease subtypes and did not correlate with cognitive performance, EDSS scores or total proton density/T2 white matter lesion volume. However, in progressive MS, the mean olfactory bulb volume correlated with depression scores (Spearman's rho = -0.38, P < 0.05) confirmed using a multivariate linear regression analysis including cognitive fatigue scores. This association was not observed in relapsing-remitting MS. CONCLUSION Olfactory bulb volume was lower in MS than in healthy controls. Olfactory bulb volume does not seem to mirror cognitive impairment in MS; however, it is associated with higher depression scores in progressive MS.
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Affiliation(s)
- Ö Yaldizli
- Department of Neurology, University Hospital Basel, Basel, Switzerland.,Department of Neuroinflammation, Queen Square MS Centre, NMR Research Unit, UCL Institute of Neurology, London, UK
| | - I-K Penner
- Department of Cognitive Psychology and Methodology, University of Basel, Basel, Switzerland
| | - T Yonekawa
- Department of Neurology, Neurological Institute, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan
| | - Y Naegelin
- Department of Neurology, University Hospital Basel, Basel, Switzerland
| | - J Kuhle
- Department of Neurology, University Hospital Basel, Basel, Switzerland
| | - M Pardini
- Department of Neuroinflammation, Queen Square MS Centre, NMR Research Unit, UCL Institute of Neurology, London, UK.,Department of Neuroscience, Rehabilitation, Ophthalmology, Genetics, Maternal and Child Health, University of Genoa, Genoa, Italy
| | - D T Chard
- Department of Neuroinflammation, Queen Square MS Centre, NMR Research Unit, UCL Institute of Neurology, London, UK.,National Institute for Health Research University College London Hospitals Biomedical Research Centre, London, UK
| | - C Stippich
- Department of Radiology, Division of Neuroradiology, University Hospital Basel, Basel, Switzerland
| | - J-I Kira
- Department of Neurology, Neurological Institute, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan
| | - K Bendfeldt
- Medical Image Analysis Center, Basel, Switzerland
| | - M Amann
- Department of Neurology, University Hospital Basel, Basel, Switzerland.,Department of Radiology, Division of Neuroradiology, University Hospital Basel, Basel, Switzerland.,Medical Image Analysis Center, Basel, Switzerland
| | - E-W Radue
- Medical Image Analysis Center, Basel, Switzerland
| | - L Kappos
- Department of Neurology, University Hospital Basel, Basel, Switzerland
| | - T Sprenger
- Department of Neurology, University Hospital Basel, Basel, Switzerland.,Department of Neurology, DKD Helios Klinik Wiesbaden, Wiesbaden, Germany
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Weavil JC, Sidhu SK, Mangum TS, Richardson RS, Amann M. Intensity-dependent alterations in the excitability of cortical and spinal projections to the knee extensors during isometric and locomotor exercise. Am J Physiol Regul Integr Comp Physiol 2015; 308:R998-1007. [PMID: 25876651 DOI: 10.1152/ajpregu.00021.2015] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.9] [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: 01/20/2015] [Accepted: 04/08/2015] [Indexed: 11/22/2022]
Abstract
We investigated the role of exercise intensity and associated central motor drive in determining corticomotoneuronal excitability. Ten participants performed a series of nonfatiguing (3 s) isometric single-leg knee extensions (ISO; 10-100% of maximal voluntary contractions, MVC) and cycling bouts (30-160% peak aerobic capacity, W peak). At various exercise intensities, electrical potentials were evoked in the vastus lateralis (VL) and rectus femoris (RF) via transcranial magnetic stimulation (motor-evoked potentials, MEP), and electrical stimulation of both the cervicomedullary junction (cervicomedullary evoked potentials, CMEP) and the femoral nerve (maximal M-waves, M max). Whereas M max remained unchanged in both muscles (P > 0.40), voluntary electromyographic activity (EMG) increased in an exercise intensity-dependent manner for ISO and cycling exercise in VL and RF (both P < 0.001). During ISO exercise, MEPs and CMEPs progressively increased in VL and RF until a plateau was reached at ∼ 75% MVC; further increases in contraction intensity did not cause additional changes (P > 0.35). During cycling exercise, VL-MEPs and CMEPs progressively increased by ∼ 65% until a plateau was reached at W peak. In contrast, RF MEPs and CMEPs progressively increased by ∼ 110% throughout the tested cycling intensities without the occurrence of a plateau. Furthermore, alterations in EMG below the plateau influenced corticomotoneuronal excitability similarly between exercise modalities. In both exercise modalities, the MEP-to-CMEP ratio did not change with exercise intensity (P > 0.22). In conclusion, increases in exercise intensity and EMG facilitates the corticomotoneuronal pathway similarly in isometric knee extension and locomotor exercise until a plateau occurs at a submaximal exercise intensity. This facilitation appears to be primarily mediated by increases in excitability of the motoneuron pool.
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Affiliation(s)
- J C Weavil
- Department of Exercise and Sport Science, University of Utah, Salt Lake City, Utah
| | - S K Sidhu
- Department of Internal Medicine, University of Utah, Salt Lake City, Utah
| | - T S Mangum
- Department of Exercise and Sport Science, University of Utah, Salt Lake City, Utah
| | - R S Richardson
- Department of Exercise and Sport Science, University of Utah, Salt Lake City, Utah; Department of Internal Medicine, University of Utah, Salt Lake City, Utah; Geriatric Research, Education, and Clinical Center, Salt Lake City Veterans Affairs Medical Center, Salt Lake City, Utah
| | - M Amann
- Department of Exercise and Sport Science, University of Utah, Salt Lake City, Utah; Department of Internal Medicine, University of Utah, Salt Lake City, Utah; Geriatric Research, Education, and Clinical Center, Salt Lake City Veterans Affairs Medical Center, Salt Lake City, Utah
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12
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Schneider MO, Engel A, Fasching PA, Häberle L, Binder EB, Voigt F, Grimm J, Faschingbauer F, Eichler A, Dammer U, Rebhan D, Amann M, Raabe E, Goecke TW, Quast C, Beckmann MW, Kornhuber J, Seifert A, Burghaus S. Genetische Varianten in Genen des Stresshormon-Signalweges und depressive Symptome während und nach der Schwangerschaft. Geburtshilfe Frauenheilkd 2014. [DOI: 10.1055/s-0034-1388587] [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: 10/24/2022] Open
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13
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14
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Goodall S, Twomey R, Amann M, Ross EZ, Lovering AT, Romer LM, Subudhi AW, Roach RC. AltitudeOmics: exercise-induced supraspinal fatigue is attenuated in healthy humans after acclimatization to high altitude. Acta Physiol (Oxf) 2014; 210:875-88. [PMID: 24450855 DOI: 10.1111/apha.12241] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.3] [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: 09/04/2013] [Revised: 10/24/2013] [Accepted: 01/17/2014] [Indexed: 02/04/2023]
Abstract
AIMS We asked whether acclimatization to chronic hypoxia (CH) attenuates the level of supraspinal fatigue that is observed after locomotor exercise in acute hypoxia (AH). METHODS Seven recreationally active participants performed identical bouts of constant-load cycling (131 ± 39 W, 10.1 ± 1.4 min) on three occasions: (i) in normoxia (N, PI O2 , 147.1 mmHg); (ii) in AH (FI O2 , 0.105; PI O2 , 73.8 mmHg); and (iii) after 14 days in CH (5260 m; PI O2 , 75.7 mmHg). Throughout trials, prefrontal-cortex tissue oxygenation and middle cerebral artery blood velocity (MCAV) were assessed using near-infrared-spectroscopy and transcranial Doppler sonography. Pre- and post-exercise twitch responses to femoral nerve stimulation and transcranial magnetic stimulation were obtained to assess neuromuscular and corticospinal function. RESULTS In AH, prefrontal oxygenation declined at rest (Δ7 ± 5%) and end-exercise (Δ26 ± 13%) (P < 0.01); the degree of deoxygenation in AH was greater than N and CH (P < 0.05). The cerebral O2 delivery index (MCAV × Ca O2 ) was 19 ± 14% lower during the final minute of exercise in AH compared to N (P = 0.013) and 20 ± 12% lower compared to CH (P = 0.040). Maximum voluntary and potentiated twitch force were decreased below baseline after exercise in AH and CH, but not N. Cortical voluntary activation decreased below baseline after exercise in AH (Δ11%, P = 0.014), but not CH (Δ6%, P = 0.174) or N (Δ4%, P = 0.298). A twofold greater increase in motor-evoked potential amplitude was evident after exercise in CH compared to AH and N. CONCLUSION These data indicate that exacerbated supraspinal fatigue after exercise in AH is attenuated after 14 days of acclimatization to altitude. The reduced development of supraspinal fatigue in CH may have been attributable to increased corticospinal excitability, consequent to an increased cerebral O2 delivery.
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Affiliation(s)
- S. Goodall
- Faculty of Health and Life Sciences; Northumbria University; Newcastle UK
| | - R. Twomey
- School of Sport and Service Management; University of Brighton; Eastbourne UK
| | - M. Amann
- Department of Medicine; University of Utah; Salt Lake City UT USA
| | - E. Z. Ross
- Physiology; English Institute of Sport; UK
| | - A. T. Lovering
- Department of Human Physiology; University of Oregon; Eugene OR USA
| | - L. M. Romer
- Centre for Sports Medicine and Human Performance; Brunel University; Uxbridge UK
| | - A. W. Subudhi
- Department of Biology; University of Colorado Colorado Springs; Colorado Springs CO USA
- Altitude Research Center; Department of Emergency Medicine; University of Colorado Anschutz Medical Campus; Aurora CO USA
| | - R. C. Roach
- Altitude Research Center; Department of Emergency Medicine; University of Colorado Anschutz Medical Campus; Aurora CO USA
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15
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Camboni D, Philipp A, Flörchinger B, Rupprecht L, Keyser A, Mueller T, Lunz D, Amann M, Kobuch R, Hilker M, Schmid C. 124 cases of Extracorporeal Membrane Oxygenation assisted mechanical resuscitation in non-postcardiotomy patients. Thorac Cardiovasc Surg 2014. [DOI: 10.1055/s-0034-1367253] [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: 10/25/2022]
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16
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Venturelli M, Amann M, Layec G, McDaniel J, Trinity JD, Fjeldstad AS, Ives SJ, Yonnet G, Richardson RS. Passive leg movement-induced hyperaemia with a spinal cord lesion: evidence of preserved vascular function. Acta Physiol (Oxf) 2014; 210:429-39. [PMID: 24119139 DOI: 10.1111/apha.12173] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [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: 06/27/2013] [Revised: 08/21/2013] [Accepted: 09/20/2013] [Indexed: 12/21/2022]
Abstract
UNLABELLED A spinal cord injury (SCI) clearly results in greater cardiovascular risk; however, accompanying changes in peripheral vascular structure below the lesion mean that the real impact of a SCI on vascular function is unclear. AIM Therefore, utilizing passive leg movement-induced (PLM) hyperaemia, an index of nitric oxide (NO)-dependent vascular function and the central hemodynamic response to this intervention, we studied eight individuals with a SCI and eight age-matched controls (CTRL). METHODS Specifically, we assessed heart rate (HR), stroke volume (SV), cardiac output (CO), mean arterial pressure (MAP), leg blood flow (LBF) and thigh composition. RESULTS In CTRL, passive movement transiently decreased MAP and increased HR and CO from baseline by 2.5 ± 1 mmHg, 7 ± 2 bpm and 0.5 ± 0.1 L min(-1) respectively. In SCI, HR and CO responses were unidentifiable. LBF increased to a greater extent in CTRL (515 ± 41 ∆mL min(-1)) compared with SCI, (126 ± 25 ∆mL min(-1)) (P < 0.05). There was a strong relationship between ∆LBF and thigh muscle volume (r = 0.95). After normalizing ∆LBF for this strong relationship (∆LBF/muscle volume), there was evidence of preserved vascular function in SCI (CTRL: 120 ± 9; SCI 104 ± 11 mL min(-1) L(-1)). A comparison of ∆LBF in the passively moved and stationary leg, to partition the contribution of the blood flow response, implied that 35% of the hyperaemia resulted from cardioacceleration in the CTRL, whereas all the hyperaemia appeared peripheral in origin in the SCI. CONCLUSION Thus, utilizing PLM-induced hyperaemia as marker of vascular function, it is evident that peripheral vascular impairment is not an obligatory accompaniment to a SCI.
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Affiliation(s)
- M. Venturelli
- Department of Neurological, Neuropsychological, Morphological and Movement Sciences; University of Verona; Verona Italy
- Department of Internal Medicine; Division of Geriatrics; University of Utah; Salt Lake City UT USA
| | - M. Amann
- Department of Internal Medicine; Division of Geriatrics; University of Utah; Salt Lake City UT USA
- Geriatric Research, Education, and Clinical Center; George E. Whalen VA Medical Center; Salt Lake City UT USA
- Department of Exercise and Sport Science; University of Utah; Salt Lake City UT USA
| | - G. Layec
- Department of Internal Medicine; Division of Geriatrics; University of Utah; Salt Lake City UT USA
| | - J. McDaniel
- Department of Internal Medicine; Division of Geriatrics; University of Utah; Salt Lake City UT USA
- Geriatric Research, Education, and Clinical Center; George E. Whalen VA Medical Center; Salt Lake City UT USA
| | - J. D. Trinity
- Department of Internal Medicine; Division of Geriatrics; University of Utah; Salt Lake City UT USA
- Geriatric Research, Education, and Clinical Center; George E. Whalen VA Medical Center; Salt Lake City UT USA
| | - A. S. Fjeldstad
- Department of Internal Medicine; Division of Geriatrics; University of Utah; Salt Lake City UT USA
| | - S. J. Ives
- Department of Internal Medicine; Division of Geriatrics; University of Utah; Salt Lake City UT USA
- Geriatric Research, Education, and Clinical Center; George E. Whalen VA Medical Center; Salt Lake City UT USA
| | - G. Yonnet
- Department of Neurology; University of Utah; Salt Lake City UT USA
| | - R. S. Richardson
- Department of Internal Medicine; Division of Geriatrics; University of Utah; Salt Lake City UT USA
- Geriatric Research, Education, and Clinical Center; George E. Whalen VA Medical Center; Salt Lake City UT USA
- Department of Exercise and Sport Science; University of Utah; Salt Lake City UT USA
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Hochholzer W, Valina CM, Stratz C, Amann M, Schlittenhardt D, Buettner HJ, Trenk D, Neumann FJ. Predictors of high-sensitivity cardiac troponin in stable patients undergoing elective coronary angiography. Eur Heart J 2013. [DOI: 10.1093/eurheartj/eht309.p3989] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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18
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Stratz C, Nuehrenberg TG, Fiebich B, Amann M, Binder H, Valin C, Hochholzer W, Trenk D, Neumann FJ. Platelet micro-RNA expression in type 2 diabetes mellitus. Eur Heart J 2013. [DOI: 10.1093/eurheartj/eht309.p3251] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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19
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Hochholzer W, Valina CM, Stratz C, Amann M, Schlittenhardt D, Buettner HJ, Trenk D, Neumann FJ. High-sensitivity cardiac troponin for risk prediction in stable patients with and without cardiac disease. Eur Heart J 2013. [DOI: 10.1093/eurheartj/eht308.p1562] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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20
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Camboni D, Lange T, Ganslmeier P, Flörchinger B, Amann M, Rupprecht L, Hirt S, Hilker M, Schmid C. Slight exercise in ambulatory LVAD patients leads to a severe compromise of hemodynamic parameters. Thorac Cardiovasc Surg 2013. [DOI: 10.1055/s-0032-1332342] [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: 10/27/2022]
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21
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Hilker M, Philip A, Arlt M, Amann M, Lunz D, Müller T, Zimmermann M, Graf B, Schmid C. Pre-hospital cardiopulmonary resuscitation supported by ECMO – a case series of 6 patients. Thorac Cardiovasc Surg 2013. [DOI: 10.1055/s-0032-1332685] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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22
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Weier K, Naegelin Y, Amann M, Magon S, Mueller-Lenke N, Radue EW, Kappos L, Stippich C, Gass A, Sprenger T. Six-year follow-up of a case series with non-communicating syringomyelia in multiple sclerosis. Eur J Neurol 2012; 20:578-583. [PMID: 23252517 DOI: 10.1111/ene.12052] [Citation(s) in RCA: 3] [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] [Received: 08/14/2012] [Accepted: 10/31/2012] [Indexed: 11/27/2022]
Abstract
BACKGROUND Non-communicating syringomyelia (NCS) has occasionally been described in case reports and small case series as an incidental finding of spinal cord (SC) pathology in patients with multiple sclerosis (MS), but only little is known on the clinical course and progression of NCS, and in more general terms on the prognosis of patients with MS and NCS. METHODS Nine patients with MS with known NCS at baseline and a control group of 18 age-, sex- and disease course-matched patients with MS without NCS were recruited for a follow-up visit after 6 years. All 27 patients underwent clinical examination and brain magnetic resonance imaging (MRI), and 8/9 patients with NCS were additionally studied with MRI of the SC. MRI data were analysed for changes in length and maximal cross-sectional area of the NCS, lesion volumes of the brain and cord as well as for volumetric metrics of the whole brain (using SIENAX), the cerebellum and medulla oblongata (using ECCET). RESULTS NCS did not significantly change in size when corrected for multiple comparisons. The clinical data (annual relapse rate, EDSS and disease duration) and MRI metrics (T2 and T1 lesion load; whole brain, cerebellar and medulla oblongata volumes as well as their percentage volume change per year) did not significantly differ between patients with MS with or without NCS. CONCLUSION The stable findings regarding size and shape of the syrinx and lack of distinguishing MRI and clinical features support the assumption that NCS is not defining a prognostically or pathogenetically distinct subgroup of patients with MS.
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Affiliation(s)
- K Weier
- Department of Neurology, University Hospital Basel, Switzerland
| | - Y Naegelin
- Department of Neurology, University Hospital Basel, Switzerland
| | - M Amann
- Department of Neurology, University Hospital Basel, Switzerland.,Division of Diagnostic and Interventional Neuroradiology, Department of Radiology and Nuclear Medicine, University Hospital Basel, Switzerland
| | - S Magon
- Department of Neurology, University Hospital Basel, Switzerland
| | - N Mueller-Lenke
- Medical Image Analysis Center (MIAC), University Hospital Basel, Switzerland
| | - E-W Radue
- Medical Image Analysis Center (MIAC), University Hospital Basel, Switzerland
| | - L Kappos
- Department of Neurology, University Hospital Basel, Switzerland
| | - C Stippich
- Division of Diagnostic and Interventional Neuroradiology, Department of Radiology and Nuclear Medicine, University Hospital Basel, Switzerland
| | - A Gass
- Department of Neurology, University Hospital Basel, Switzerland.,MR Research Neurology, University Hospital Mannheim, Germany
| | - T Sprenger
- Department of Neurology, University Hospital Basel, Switzerland.,Division of Diagnostic and Interventional Neuroradiology, Department of Radiology and Nuclear Medicine, University Hospital Basel, Switzerland
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Reis S, Grennfelt P, Klimont Z, Amann M, ApSimon H, Hettelingh JP, Holland M, LeGall AC, Maas R, Posch M, Spranger T, Sutton MA, Williams M. Atmospheric science. From acid rain to climate change. Science 2012. [PMID: 23197517 DOI: 10.1126/science.1226514] [Citation(s) in RCA: 107] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Affiliation(s)
- S Reis
- Centre for Ecology & Hydrology, Penicuik EH26 0QB, UK.
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Rossman MJ, Venturelli M, McDaniel J, Amann M, Richardson RS. Muscle mass and peripheral fatigue: a potential role for afferent feedback? Acta Physiol (Oxf) 2012; 206:242-50. [PMID: 22762286 DOI: 10.1111/j.1748-1716.2012.02471.x] [Citation(s) in RCA: 57] [Impact Index Per Article: 4.8] [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] [Received: 04/23/2012] [Accepted: 04/25/2012] [Indexed: 01/01/2023]
Abstract
AIM The voluntary termination of exercise has been hypothesized to occur at a sensory tolerance limit, which is affected by feedback from group III and IV muscle afferents, and is associated with a specific level of peripheral quadriceps fatigue during whole body cycling. Therefore, the purpose of this study was to reduce the amount of muscle mass engaged during dynamic leg exercise to constrain the source of muscle afferent feedback to the central nervous system (CNS) and examine the effect on peripheral quadriceps fatigue. METHOD Eight young males performed exhaustive large (cycling - BIKE) and small (knee extensor - KE) muscle mass dynamic exercise at 85% of the modality-specific maximal workload. Pre- vs. post-exercise maximal voluntary contractions (MVC) and supramaximal magnetic femoral nerve stimulation (Q(tw,pot)) were used to quantify peripheral quadriceps fatigue. RESULT Significant quadriceps fatigue was evident following both exercise trials; however, the exercise-induced changes in MVC (-28 ± 1% vs. -16 ± 2%) and Q(tw,pot) (-53 ± 2% vs. -34 ± 2%) were far greater following KE compared to BIKE exercise, respectively. The greater degree of quadriceps fatigue following KE exercise was in proportion to the greater exercise time (9.1 ± 0.4 vs. 6.3 ± 0.5 min, P < 0.05), suggestive of a similar rate of peripheral fatigue development. CONCLUSION These data suggest that when the source of skeletal muscle afferent feedback is confined to a small muscle mass, the CNS tolerates a greater magnitude of peripheral fatigue and likely a greater intramuscular metabolic disturbance. An important implication of this finding is that the adoption of small muscle mass exercise may facilitate greater exercise-induced muscular adaptation.
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Affiliation(s)
- M J Rossman
- Geriatric Research, Education, and Clinical Center, George E. Whalen VA Medical Center, Salt Lake City, UT, USA
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Dempsey JA, Amann M, Harms CA, Wetter TJ. Respiratory System Limitations to Performance in the Healthy Athlete: Some Answers, More Questions! Dtsch Z Sportmed 2012. [DOI: 10.5960/dzsm.2012.01106] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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26
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Flörchinger B, Amann M, Schmid C. 72-jähriger Patient mit KHK und Aortenklappenstenose. Dtsch Med Wochenschr 2012; 137:669-70. [DOI: 10.1055/s-0031-1298971] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Affiliation(s)
- B. Flörchinger
- Klink für Herz-, Thorax- und herznahe Gefäßchirurgie, Klinikum der Universität Regensburg
| | - M. Amann
- Klinik für Anästhesiologie, Klinikum der Universität Regensburg
| | - C. Schmid
- Klink für Herz-, Thorax- und herznahe Gefäßchirurgie, Klinikum der Universität Regensburg
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Venturelli M, Amann M, McDaniel J, Trinity JD, Fjeldstad AS, Richardson RS. Central and peripheral hemodynamic responses to passive limb movement: the role of arousal. Am J Physiol Heart Circ Physiol 2011; 302:H333-9. [PMID: 22003056 DOI: 10.1152/ajpheart.00851.2011] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [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: 11/22/2022]
Abstract
The exact role of arousal in central and peripheral hemodynamic responses to passive limb movement in humans is unclear but has been proposed as a potential contributor. Thus, we used a human model with no lower limb afferent feedback to determine the role of arousal on the hemodynamic response to passive leg movement. In nine people with a spinal cord injury, we compared central and peripheral hemodynamic and ventilatory responses to one-leg passive knee extension with and without visual feedback (M+VF and M-VF, respectively) as well as in a third trial with no movement or visual feedback but the perception of movement (F). Ventilation (Ve), heart rate, stroke volume, cardiac output, mean arterial pressure, and leg blood flow (LBF) were evaluated during the three protocols. Ve increased rapidly from baseline in M+VF (55 ± 11%), M-VF (63 ± 13%), and F (48 ± 12%) trials. Central hemodynamics (heart rate, stroke volume, cardiac output, and mean arterial pressure) were unchanged in all trials. LBF increased from baseline by 126 ± 18 ml/min in the M+VF protocol and 109 ± 23 ml/min in the M-VF protocol but was unchanged in the F protocol. Therefore, with the use of model that is devoid of afferent feedback from the legs, the results of this study reveal that, although arousal is invoked by passive movement or the thought of passive movement, as evidenced by the increase in Ve, there is no central or peripheral hemodynamic impact of this increased neural activity. Additionally, this study revealed that a central hemodynamic response is not an obligatory component of movement-induced LBF.
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Affiliation(s)
- Massimo Venturelli
- Department of Neurological, Neuropsychological, Morphological, and Movement Sciences University of Verona, Italy
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Rigotti DJ, Gass A, Achtnichts L, Inglese M, Babb JS, Naegelin Y, Hirsch J, Amann M, Kappos L, Gonen O. Multiple Sclerosis Severity Scale and whole-brain N-acetylaspartate concentration for patients' assessment. Mult Scler 2011; 18:98-107. [PMID: 21921070 DOI: 10.1177/1352458511415142] [Citation(s) in RCA: 6] [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: 11/16/2022]
Abstract
BACKGROUND The ability to predict the course of multiple sclerosis (MS) is highly desirable but lacking. OBJECTIVE To test whether the MS Severity Scale (MSSS) and global neuronal viability, assessed through the quantification of the whole-brain N-acetylaspartate concentration (WBNAA), concur or complement the assessment of individual patients' disease course. METHODS The MSSS and average WBNAA loss rate (ΔWBNAA, extrapolated based on one current measurement and the assumption that at disease onset neural sparing was similar to healthy controls, obtained with proton magnetic resonance (MR) spectroscopy and magnetic resonance imaging (MRI)) from 61 patients with MS (18 male and 43 female) with long disease duration (15 years or more) were retrospectively examined. Some 27 patients exhibited a 'benign' disease course, characterized by an Expanded Disability Status Scale score (EDSS) of 3.0 or less, and 34 were 'non-benign': EDSS score higher than 3.0. RESULTS The two cohorts were indistinguishable in age and disease duration. Benign patients' EDSS and MSSS (2.1 ± 0.7, 1.15 ± 0.60) were significantly lower than non-benign (4.6 ± 1.0, 3.6 ± 1.2; both p < 10(-4)). Their respective average ΔWBNAA, 0.10 ± 0.16 and 0.11 ± 0.12 mM/year, however, were not significantly different (p > 0.7). While MSSS is both sensitive to (92.6%) and specific for (97.0%) benign MS, ΔWBNAA is only sensitive (92.6%) but not specific (2.9%). CONCLUSION Since the WBNAA loss rate is similar in both phenotypes, the only difference between them is their clinical classification, characterized by MSSS and EDSS. This may indicate that 'benign' MS probably reflects fortuitous sparing of clinically eloquent brain regions and better utilization of brain plasticity.
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Affiliation(s)
- D J Rigotti
- Department of Radiology, New York University School of Medicine, New York, USA
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Zibek S, Rupp S, Hirth T, Amann M, Ludwig D, Hirth T. Laccase-katalysierte Detoxifizierung von löslichen Ligninabbauprodukten in vorbehandelten Lignocellulose-Hydrolysaten. CHEM-ING-TECH 2010. [DOI: 10.1002/cite.201000079] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Amann M, Doessegger L, Hirsch J, Penner I, Raselli C, Weier K, Duyar H, Kappos L, Radue E, Gass A. 16. Functional adaption to working memory tasks is altered in patients with relapsing–remitting multiple sclerosis. Clin Neurophysiol 2009. [DOI: 10.1016/j.clinph.2009.07.020] [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: 11/17/2022]
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Hövener JB, Rigotti DJ, Amann M, Liu S, Babb JS, Bachert P, Gass A, Grossman RI, Gonen O. Whole-brain N-acetylaspartate MR spectroscopic quantification: performance comparison of metabolite versus lipid nulling. AJNR Am J Neuroradiol 2008; 29:1441-5. [PMID: 18556356 PMCID: PMC2576739 DOI: 10.3174/ajnr.a1171] [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] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2008] [Accepted: 04/12/2008] [Indexed: 11/07/2022]
Abstract
BACKGROUND AND PURPOSE Despite the prominent peak of N-acetylaspartate (NAA) in proton MR spectroscopy ((1)H-MR spectroscopy) of the adult brain and its almost exclusive presence in neuronal cells, the total amount of NAA, regarded as their marker, is difficult to obtain due to signal contamination from the skull lipids. This article compares the performance of 2 methods that overcome this difficulty to yield the whole-brain NAA signal, important for the assessment of the total disease load in diffuse neurologic disorders. MATERIALS AND METHODS The heads of 12 healthy volunteers, 3 women and 9 men, 31.0 +/- 7.1 years of age, were scanned at 3T by using 2 nonlocalizing (1)H-MR spectroscopy sequences: One nulls the NAA (TI = 940 ms) every second acquisition by inversion-recovery to cancel the signals of the lipids (T1 << TI) in an add-subtract scheme. The other nulls the signal of the lipids (TI = 155 ms) directly after each acquisition, requiring half as many averages for the same signal-to-noise ratio. Each sequence was repeated 3 times back-to-back on 3 occasions, and the comparison criteria were intrasubject precision (reproducibility) and total measurement duration. RESULTS NAA nulling is nearly twice as precise in its intrinsic back-to-back (5.8% versus 8.6%) as well as longitudinal (10.6% versus 19.7%) coefficients of variation compared with lipid nulling, but at the cost of double the acquisition time. CONCLUSION When speed is a more stringent requirement than precision, the new lipid-nulling sequence is a viable alternative. For precision in cross-sectional or longitudinal global NAA quantification, however, NAA nulling is still the approach of choice despite its x2 ( approximately 5 minutes) time penalty compared with the lipid-nulling approach.
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Affiliation(s)
- J-B Hövener
- Department of Radiology, New York University School of Medicine, New York, NY 10016, USA
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Schmitter S, Diesch E, Amann M, Kroll A, Moayer M, Schad LR. Silent echo-planar imaging for auditory FMRI. MAGMA 2008; 21:317-25. [PMID: 18716815 DOI: 10.1007/s10334-008-0132-4] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/28/2008] [Revised: 07/21/2008] [Accepted: 07/22/2008] [Indexed: 11/28/2022]
Abstract
INTRODUCTION The effect of the acoustic scanner noise produced by gradient coil switching on the auditory evoked BOLD signal represents a well-known problem in auditory functional MRI (FMRI). In this paper, a new low-noise echo-planar imaging (EPI) sequence is presented that is optimized for auditory FMRI measurements. METHODS The sequence produces a narrow-band acoustic frequency spectrum by using a sinusoidal readout echo train and a constant phase encoding gradient. This narrow band is adapted to the frequency response function of the MR scanner by varying the switching frequency of the sinusoidal readout gradient. RESULTS Compared to a manufacturer-provided standard EPI sequence, the acoustic noise reduction amounts to up to 20 dBA. Using a simple block design paradigm contrasting presentation of a pure tone during ON blocks and "silence" (absence of the tone) during OFF blocks, the new low-noise sequence was evaluated and compared to the standard EPI sequence. Statistical parametric mapping (SPM) resulted in higher levels of significance of auditory activation for the low-noise sequence. DISCUSSION These findings strongly suggest that the low-noise sequence may generate enhanced BOLD contrasts compared to the standard EPI sequences commonly used in FMRI.
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Affiliation(s)
- S Schmitter
- Division of Medical Physics in Radiology, German Cancer Research Center, Im Neuenheimer Feld 280, 69120, Heidelberg, Germany.
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Achtnichts L, Amann M, Hirsch J, Weier K, Duyar H, Merkle A, Hövener JB, Sollberger M, Monsch A, Gonen O, Gass A. Assessment of whole brain N-acetylaspartate – a new additional MR marker in mild cognitive impairment and Alzheimer's disease. Akt Neurol 2007. [DOI: 10.1055/s-2007-987561] [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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Shindell DT, Faluvegi G, Stevenson DS, Krol MC, Emmons LK, Lamarque JF, Pétron G, Dentener FJ, Ellingsen K, Schultz MG, Wild O, Amann M, Atherton CS, Bergmann DJ, Bey I, Butler T, Cofala J, Collins WJ, Derwent RG, Doherty RM, Drevet J, Eskes HJ, Fiore AM, Gauss M, Hauglustaine DA, Horowitz LW, Isaksen ISA, Lawrence MG, Montanaro V, Müller JF, Pitari G, Prather MJ, Pyle JA, Rast S, Rodriguez JM, Sanderson MG, Savage NH, Strahan SE, Sudo K, Szopa S, Unger N, van Noije TPC, Zeng G. Multimodel simulations of carbon monoxide: Comparison with observations and projected near-future changes. ACTA ACUST UNITED AC 2006. [DOI: 10.1029/2006jd007100] [Citation(s) in RCA: 228] [Impact Index Per Article: 12.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Dentener F, Stevenson D, Ellingsen K, Van Noije T, Schultz M, Amann M, Atherton C, Bell N, Bergmann D, Bey I, Bouwman L, Butler T, Cofala J, Collins B, Drevet J, Doherty R, Eickhout B, Eskes H, Fiore A, Gauss M, Hauglustaine D, Horowitz L, Isaksen ISA, Josse B, Lawrence M, Krol M, Lamarque JF, Montanaro V, Müller JF, Peuch VH, Pitari G, Pyle J, Rast S, Rodriguez I, Sanderson M, Savage NH, Shindell D, Strahan S, Szopa S, Sudo K, Van Dingenen R, Wild O, Zeng G. The global atmospheric environment for the next generation. Environ Sci Technol 2006; 40:3586-94. [PMID: 16786698 DOI: 10.1021/es0523845] [Citation(s) in RCA: 48] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/10/2023]
Abstract
Air quality, ecosystem exposure to nitrogen deposition, and climate change are intimately coupled problems: we assess changes in the global atmospheric environment between 2000 and 2030 using 26 state-of-the-art global atmospheric chemistry models and three different emissions scenarios. The first (CLE) scenario reflects implementation of current air quality legislation around the world, while the second (MFR) represents a more optimistic case in which all currently feasible technologies are applied to achieve maximum emission reductions. We contrast these scenarios with the more pessimistic IPCC SRES A2 scenario. Ensemble simulations for the year 2000 are consistent among models and show a reasonable agreement with surface ozone, wet deposition, and NO2 satellite observations. Large parts of the world are currently exposed to high ozone concentrations and high deposition of nitrogen to ecosystems. By 2030, global surface ozone is calculated to increase globally by 1.5 +/- 1.2 ppb (CLE) and 4.3 +/- 2.2 ppb (A2), using the ensemble mean model results and associated +/-1 sigma standard deviations. Only the progressive MFR scenario will reduce ozone, by -2.3 +/- 1.1 ppb. Climate change is expected to modify surface ozone by -0.8 +/- 0.6 ppb, with larger decreases over sea than over land. Radiative forcing by ozone increases by 63 +/- 15 and 155 +/- 37 mW m(-2) for CLE and A2, respectively, and decreases by -45 +/- 15 mW m(-2) for MFR. We compute that at present 10.1% of the global natural terrestrial ecosystems are exposed to nitrogen deposition above a critical load of 1 g N m(-2) yr(-1). These percentages increase by 2030 to 15.8% (CLE), 10.5% (MFR), and 25% (A2). This study shows the importance of enforcing current worldwide air quality legislation and the major benefits of going further. Nonattainment of these air quality policy objectives, such as expressed by the SRES-A2 scenario, would further degrade the global atmospheric environment.
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Affiliation(s)
- F Dentener
- Joint Research Centre, Institute for Environment and Sustainability, via E. Fermi 1, 1-21020, Ispra, Italy.
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Stevenson DS, Dentener FJ, Schultz MG, Ellingsen K, van Noije TPC, Wild O, Zeng G, Amann M, Atherton CS, Bell N, Bergmann DJ, Bey I, Butler T, Cofala J, Collins WJ, Derwent RG, Doherty RM, Drevet J, Eskes HJ, Fiore AM, Gauss M, Hauglustaine DA, Horowitz LW, Isaksen ISA, Krol MC, Lamarque JF, Lawrence MG, Montanaro V, Müller JF, Pitari G, Prather MJ, Pyle JA, Rast S, Rodriguez JM, Sanderson MG, Savage NH, Shindell DT, Strahan SE, Sudo K, Szopa S. Multimodel ensemble simulations of present-day and near-future tropospheric ozone. ACTA ACUST UNITED AC 2006. [DOI: 10.1029/2005jd006338] [Citation(s) in RCA: 632] [Impact Index Per Article: 35.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Cofala J, Amann M, Gyarfas F, Schoepp W, Boudri JC, Hordijk L, Kroeze C, Junfeng L, Lin D, Panwar TS, Gupta S. Cost-effective control of SO2 emissions in Asia. J Environ Manage 2004; 72:149-161. [PMID: 15251221 DOI: 10.1016/j.jenvman.2004.04.009] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/08/2003] [Revised: 03/23/2004] [Accepted: 04/06/2004] [Indexed: 05/24/2023]
Abstract
Despite recent efforts to limit the growth of SO(2) emissions in Asia, the negative environmental effects of sulphur emissions are likely to further increase in the future. This paper presents an extension of the RAINS-Asia integrated assessment model for acidification in Asia with an optimisation routine that can be used to identify cost-effective emission control strategies that achieve environmental targets for ambient SO(2) concentrations and sulphur deposition at least costs. Example scenarios developed with this optimisation module demonstrate a potential for significant cost savings in Asia, if emission controls are allocated to those sources that have the largest environmental impact and are cheapest to control. It is shown that strategies that simultaneously address harmful population exposure and the risk of vegetation damage from acid deposition result in the most cost-effective use of resources spent for emission controls.
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Affiliation(s)
- J Cofala
- International Institute for Applied Systems Analysis, A 2361 Laxenburg, Austria.
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Bachmann S, Bottmer C, Pantel J, Schröder J, Amann M, Essig M, Schad LR. MRI-morphometric changes in first-episode schizophrenic patients at 14 months follow-up. Schizophr Res 2004; 67:301-3. [PMID: 14984892 DOI: 10.1016/s0920-9964(03)00002-1] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/13/2002] [Indexed: 11/29/2022]
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Giesel FL, Seidl U, Hempel A, Meyer H, Amann M, Schröder J. Altersabhängige Veränderungen des Arbeitsgedächtnisses - Untersuchungen mit funktioneller Magnetresonanztomographie. Akt Neurol 2004. [DOI: 10.1055/s-2004-833076] [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: 10/28/2022]
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En Naciri A, Johann L, Kleim R, Sieskind M, Amann M. Surface Effects of the HgI(2) Crystal Characterized by Spectroscopic Ellipsometry. Appl Opt 2001; 40:4519-4525. [PMID: 18360492 DOI: 10.1364/ao.40.004519] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
We report on determination of the surface effects of mercuric iodide (HgI(2)) uniaxial HgI(2) optical parameters with a fixed-polarizer, rotating-polarizer, and fixed-analyzer spectroscopic ellipsometer (PRPSE) after chemical polishing. The characteristics of the chemical complex [KHgI(3), H(2)O] that forms on the HgI(2) surface during KI etching have been investigated over the spectral range from 400 to 800 nm. Surface roughness and effects of the ellipsometric parameters of HgI(2) were treated, and the thickness of the layer formed on the surface was determined and analyzed by PRPSE. The surface roughness was modeled with the Bruggeman effective medium approximation.
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Abstract
Tropospheric ozone concentrations regarded as harmful for human health are frequently encountered in Central Europe in summertime. Although ozone formation generally results from precursors transported over long distances, in urban areas local effects, such as reactions due to nearby emission sources, play a major role in determining ozone concentrations. Europe-wide mapping and modeling of population exposure to high ozone concentrations is subject to many uncertainties, because small-scale phenomena in urban areas can significantly change ozone levels from those of the surroundings. Currently the integrated assessment modeling of European ozone control strategies is done utilizing the results of large-scale models intended for estimating the rural background ozone levels. This paper presents an initial study on how much local nitrogen oxide (NOx) concentrations can explain variations between large-scale ozone model results and urban ozone measurements, on one hand, and between urban and nearby rural measurements, on the other. The impact of urban NOx concentrations on ozone levels was derived from chemical equations describing the ozone balance. The study investigated the applicability of the method for improving the accuracy of modeled population exposure, which is needed for efficient control strategy development. The method was tested with NOx and ozone measurements from both urban and rural areas in Switzerland and with the ozone predictions of the large-scale photochemical model currently used in designing Europe-wide control strategies for ground-level ozone. The results suggest that urban NOx levels are a significant explanatory factor in differences between urban and nearby rural ozone concentrations and that the phenomenon could be satisfactorily represented with this kind of method. Further research efforts should comprise testing of the method in more locations and analyzing the performance of more widely applicable ways of deriving the initial parameters.
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Affiliation(s)
- S Syri
- Finnish Environment Institute, PO Box 140, FIN-00251 Helsinki, Finland.
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Abstract
Complying with the obligation in the current ozone directive, the European Commission came forward in 1999 with a strategy to combat tropospheric ozone together with a proposed revision of the air quality legislation for this pollutant. As a daughter legislation under the 1996 Framework Directive on Air Quality, the proposed ozone daughter directive defines for the first time (interim) air quality targets for ozone to be attained by 2010, complemented by long-term objectives for ozone based on the guideline values of the World Health Organisation. It also sets out enhanced requirements for monitoring and assessment of ozone concentrations, as well as minimum criteria for appropriate information of the public about the measured air pollution. In the past, abatement strategies against air pollution consisted of concrete obligations for controlling emissions derived solely on the basis of technical and economic aspects, covering specific types of installations or activities, thus with no direct quantitative relationship to the level of air pollution let alone to its effects. In compensating this deficit, the Commission presented, as a complement to the existing sectoral legislation, a proposal for a directive on national emission ceilings (NEC) which quantifies emission targets for every Member State to bring its total precursor emissions by 2010 down to levels being considered as necessary to achieve everywhere on a regional scale the air quality targets set in the ozone daughter directive. As the core element of the ozone abatement strategy, the national ceilings for emissions of sulfur dioxide (SO(2)), nitrogen oxides (NO(x)), ammonia (NH(3)) and volatile organic compounds (VOC) were derived from a cost-effectiveness analysis integrating information on economic, technical, physical and biological aspects of ozone pollution and abatement. This integrated assessment considers the potential and costs for further emission control in the various economic sectors in the Member States and combines this with information on ozone formation and transport processes in the atmosphere and with indicators for the impact of ozone on human health and environmental. Reflecting the discussions with Member States and stakeholders, a number of decisive steps in the process of deriving the national emission ceilings are presented here: the way of framing interim objectives, how to choose an appropriate ambition level, aspects of how to cope with uncertainties in the model and the input data and how to treat extreme meteorological situations and resolve problems in the spatial distribution of the interim objectives given the different size of countries. Finally, the paper explains the scenario underpinning the proposed national emission ceilings, its environmental gains and the distribution of cost incurring for emission control measures in Member States.
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Affiliation(s)
- M Amann
- International Institute for Applied Systems Analysis (IIASA), A-2361, Laxenburg, Austria.
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Amann M. Contracting for occupational health services: Part 2--Contracting tips. AAOHN J 1999; 47:227-8. [PMID: 10639944] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/15/2023]
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En Naciri A, Johann L, Kleim R, Sieskind M, Amann M. Spectroscopic ellipsometry of anisotropic materials: application to the optical constants of HgI2. Appl Opt 1999; 38:647-654. [PMID: 18305658 DOI: 10.1364/ao.38.000647] [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] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
A variable angle-of-incidence spectroscopic fixed-polarizer, rotating-polarizer, fixed-analyzer ellipsometer (PRPSE) across a spectral range from 300 to 800 nm is used to determine the optical properties of anisotropic uniaxial tetragonal red mercuric iodide (HgI(2)). For the first time, to our knowledge, the bulk crystal HgI(2) surface measured by ellipsometry was not subjected to potassium iodide cutting or etching. Measurements were made at an air-HgI(2) interface with the optic axis parallel to the sample surface. To determine the optical constants, we varied both the angle of incidence and the azimuth of the optic axis with the plane of incidence. The detailed formulas needed for reliable procedures for analyzing the data are presented. The ordinary and extraordinary complex indices of refraction, (n(o)--ik(o)) and (n(e)--ik(e)), respectively, are determined. Good agreement between PRPSE and the prism technique for the refractive index is observed. The surface aging effects of the ellipsometric parameters of HgI(2), during 30 h of exposure to air, were detected by PRPSE.
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Affiliation(s)
- A En Naciri
- Laboratoire de Physique des Liquides et Interfaces, 1 Boulevard Arago, CP 87811, 57078 Metz Cedex 3, France
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Amann M. Ten tips for becoming "indispensable". AAOHN J 1998; 46:555-6. [PMID: 9934004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/10/2023]
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Amann M. Performance management. Part 2: performance review and appraisal. AAOHN J 1996; 44:421-2. [PMID: 8852241] [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: 02/02/2023]
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Amann M. Performance management part 1: setting goals and objectives. AAOHN J 1996; 44:260-1. [PMID: 8788402] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Affiliation(s)
- M Amann
- Occupational Health Services, AT&T, Chicago, IL, USA
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Amann M. Collaboration: the right ingredient for success. AAOHN J 1996; 44:105-6. [PMID: 8694976] [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: 02/01/2023]
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