the antiarrhythmic effect of the cardioselective beta-adrenoreceptor blocking agent metoprolol , given intravenously , was studied in 20 patients with acute supraventricular tachyarrhythmias , including patients with congestive heart failure , acute myocardial infarction and complete bundle branch block .
C0025859
metoprolol
C0018802
congestive heart