201. Prevalence and prediction of exercise-induced oxygen desaturation in patients with chronic obstructive pulmonary disease
- Author
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Helmut Teschler, Malcolm Kohler, Christian F. Clarenbach, Anne-Christin Stöwhas, A J R van Gestel, Sebastian Teschler, and Erich W. Russi
- Subjects
Pulmonary and Respiratory Medicine ,Male ,medicine.medical_specialty ,Medizin ,Pulmonary disease ,Pulmonary function testing ,Pulmonary Disease, Chronic Obstructive ,Predictive Value of Tests ,Internal medicine ,Forced Expiratory Volume ,medicine ,Prevalence ,Humans ,In patient ,Hypoxia ,Exercise ,Aged ,Carbon Monoxide ,Oxygen desaturation ,business.industry ,Oxygen metabolism ,fungi ,food and beverages ,Small sample ,Middle Aged ,Respiratory Function Tests ,Oxygen ,Predictive value of tests ,Anesthesia ,Cardiology ,Exercise Test ,Female ,business - Abstract
Background: Previous studies with small sample sizes reported contradicting findings as to whether pulmonary function tests can predict exercise-induced oxygen desaturation (EID). Objective: To evaluate whether forced expiratory volume in one second (FEV1), resting oxygen saturation (Spo2) and diffusion capacity for carbon monoxide (Dlco) are predictors of EID in chronic obstructive pulmonary disease (COPD). Methods: We measured FEV1, Dlco, Spo2 at rest and during a 6-min walking test as well as physical activity by an accelerometer. A drop in Spo2 of >4 to Results: We included 154 patients with COPD (87 females). The mean FEV1 was 43.0% (19.2) predicted and the prevalence of EID was 61.7%. The only independent predictor of EID was FEV1 and the optimal cutoff value of FEV1 was at 50% predicted (area under ROC curve, 0.85; p < 0.001). The positive predictive value of a threshold of FEV1 1 ≥80% was 1.0. The severity of EID was correlated with daily physical activity (r = –0.31, p = 0.008). Conclusions: EID is highly prevalent among patients with COPD and can be predicted by FEV1. EID seems to be associated with impaired daily physical activity which supports its clinical importance.
- Published
- 2011