Verapamil responsive reentrant ventricular tachycardia: a case report with electrophysiological investigation.

A patient with left ventricular aneurysm had recurrent ventricular tachycardia. His arrhythmia could be induced and interrupted by programmed ventricular stimulation. Quinidine and procainamide facilitated the induction of the tachycardia by widening the tachycardia induction zone. Ajmaline slowed the rate of the induced tachycardia and verapamil abolished the arrhythmia. The possible mechanism underlying these phenomena is discussed.