Advantages of systolic time intervals over echocardiography in the measurement of left ventricular ejection fraction.
D000328:Adult; D000368:Aged; D002302:Cardiac Output; D004452:Echocardiography / Q000379:methods; D004562:Electrocardiography; D006326:Heart Auscultation; D006331:Heart Diseases / Q000175:diagnosis*; D006801:Humans; D008875:Middle Aged; D009200:Myocardial Contraction; D010701:Phonocardiography; D013318:Stroke Volume; D013599:Systole