[Study of the effects of Valsalva's maneuver on the electrocardiogram and its clinical significance in patients with chronic respiratory diseases].
D000293:Adolescent; D000328:Adult; D000368:Aged; D001987:Bronchiectasis / Q000175:diagnosis; D002908:Chronic Disease; D004562:Electrocardiography; D005260:Female; D006801:Humans; D008171:Lung Diseases / Q000175:diagnosis*; D008297:Male; D008875:Middle Aged; D011656:Pulmonary Emphysema / Q000175:diagnosis; D011660:Pulmonary Heart Disease / Q000175:diagnosis; D012140:Respiratory Tract Diseases / Q000175:diagnosis*; D014636:Valsalva Maneuver