its absence of cardiac toxicity , its powerful antiarrhythmic properties , its depressive effect on the av nodal conduction , combined with its beta-inhibitory effect makes it effective and harmless in practically all forms of atrial , junctional and ventricular arrhythmias , whatever the reentrant or automatic mechanism of the arrhythmia .
C0085612
ventricular
C0003811
arrhythmia