an intracardiac electrophysiologic study of 73 patients , including those without ventricular arrhythmias , those with chronic ventricular ectopic activity of varying levels , and those with paroxysmal or nonparoxysmal ventricular tachycardia , has identified specific electrophysiologic phenomena that may be used as criteria for the diagnosis of paroxysmal ventricular tachycardias and assessment of the effect of anti-arrhythmic drugs at electrophysiologic testing .
C0085612
ventricular arrhythmias
C0042514
ventricular