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Flow limitation and dynamic hyperinflation during exercise in COPD patients after single lung transplantation.
- Source :
-
Chest [Chest] 2000 Nov; Vol. 118 (5), pp. 1248-54. - Publication Year :
- 2000
-
Abstract
- Study Objective: Using the negative expiratory pressure (NEP) method, we have previously shown that patients receiving single lung transplantation (SLT) for COPD do not exhibit expiratory flow limitation and have little dyspnea at rest. In the present study, we assessed whether SLT patients exhibit flow limitation, overall hyperinflation, and dyspnea during exercise.<br />Methods: Expiratory flow limitation assessed by the NEP method and inspiratory capacity maneuvers used to determine end-expiratory lung volume (EELV) and end-inspiratory lung volume (EILV) were performed at rest and during symptom-limited incremental cycle exercise in eight SLT patients.<br />Results: At the time of the study, the mean (+/- SD) FEV(1), FVC, functional residual capacity, and total lung capacity (TLC) amounted to 55 +/- 14%, 67 +/- 12%, 137 +/- 16%, and 110 +/- 11% of predicted, respectively. At rest, all patients did not experience expiratory flow limitation and were without dyspnea. At peak exercise, the maximal mechanical power output and maximal oxygen consumption amounted to 72 +/- 20% and 65 +/- 8% of predicted, respectively, with a maximal dyspnea Borg score of 6 +/- 3. All but one patient exhibited flow limitation and dynamic hyperinflation; the EELV and EILV amounted to 74 +/- 5% and 95 +/- 9% TLC, respectively. The patient who did not exhibit flow limitation during exercise had the lowest dyspnea score.<br />Conclusion: Most SLT patients for COPD exhibit expiratory flow limitation and dynamic hyperinflation during exercise, whereas maximal dyspnea is variable.
- Subjects :
- Aged
Analysis of Variance
Dyspnea physiopathology
Exercise Test
Female
Forced Expiratory Volume physiology
Forecasting
Functional Residual Capacity physiology
Humans
Inspiratory Capacity physiology
Least-Squares Analysis
Linear Models
Lung Diseases, Obstructive physiopathology
Lung Volume Measurements
Male
Middle Aged
Oxygen Consumption physiology
Pressure
Respiratory Mechanics physiology
Rest physiology
Total Lung Capacity physiology
Vital Capacity physiology
Lung physiopathology
Lung Diseases, Obstructive surgery
Lung Transplantation physiology
Physical Exertion physiology
Respiratory Physiological Phenomena
Subjects
Details
- Language :
- English
- ISSN :
- 0012-3692
- Volume :
- 118
- Issue :
- 5
- Database :
- MEDLINE
- Journal :
- Chest
- Publication Type :
- Academic Journal
- Accession number :
- 11083671
- Full Text :
- https://doi.org/10.1378/chest.118.5.1248