Doppler echocardiographic features of mechanical alternans.
D000328:Adult; D001145:Arrhythmias, Cardiac / Q000209:etiology / Q000503:physiopathology*; D004452:Echocardiography; D006333:Heart Failure / Q000150:complications; D006801:Humans; D008297:Male; D009200:Myocardial Contraction; D013318:Stroke Volume