title: Influence of posture on pulmonary gas exchange and heart rate in chronic obstructive lung disease.
abstract: Sixteen subjects with chronic obstructive lung disease were studied in supine and sitting position. VT, VE, VD and VD/VT were definitely higher in the sitting position (p less than 0.001). PaCO2 was slightly lower in the sitting position, whereas Pa¿O2 was the same in both positions. P(A-a)O2 was essentially the same in both positions, but the estimated QS/QT was definitely lower in the sitting position. In patients with low FEV1.0 the heart rate showed a tendency towards higher values in the sitting position.
mesh_terms: D000328:Adult; D000368:Aged; D002908:Chronic Disease; D005260:Female; D005541:Forced Expiratory Volume; D006339:Heart Rate; D006801:Humans; D008173:Lung Diseases, Obstructive / Q000503:physiopathology*; D008297:Male; D008875:Middle Aged; D010313:Partial Pressure; D011187:Posture; D012119:Respiration; D012126:Respiratory Dead Space; D014692:Ventilation-Perfusion Ratio; D014797:Vital Capacity