| Abstrakt: |
To evaluate the frequency of the causes of exercise limitation in patients with chronic pulmonary disease and to assess the relationship between the resting pulmonary functional parameters and the degree of exercise dyspnea, we reviewed the data from 88consecutive stable patients with chronic lung disease (62COPD, 16interstitial lung disease [ILD]). In each patient, the intensity of dyspnea was measured by a Borg scale (BS) during an incremental symptom-limited exercise test. COPD patients stopped exercise due to fatigue (46%),dyspnea (36%),cardiac limitation (12%),and peripheral circulatory limitation (6%). ILDpatients stopped exercise due to dyspnea (62%),fatigue (25%),and cardiac limitation (12%).In all patients, dyspnea severity increased linearly with exercise intensity as measured as VO2, VE, and VE/MW. The severity of dyspnea expressed as the slope of the relationship between BS and VE/MW (DBS/D[VE/MVV]) showed in COPD a significant inverse correlation with VC, FEV1, MIP, and a positive correlation with PaCO2and VE/MVVat rest. In ILD, DBS/D(VE/MVV) showed a significant inverse correlation with VC, FEV1, TLC, and PaO2and a positive correlation with VE/MWat rest. The predicting power of all equations was very low. |
