Effects of the Valsalva maneuver on the cardiac systolic intervals: beat-to-beat versus timed analysis.
D000328:Adult; D000792:Angiography; D002302:Cardiac Output; D004562:Electrocardiography; D006339:Heart Rate; D006801:Humans; D008297:Male; D010701:Phonocardiography; D014636:Valsalva Maneuver; D016276:Ventricular Function