Disopyramide induced atypical ventricular tachycardia.

A patient presenting with atypical ventricular tachycardia due to oral disopyramide given in normal doses over a period of four months is described. This arrhythmia was preceded by marked prolongation of the QTc. It is suggested that patients receiving treatment with oral disopyramide should be closely monitored for symptoms of ventricular tachyarrhythmias, particularly in the face of a prolonged QTc.