Benefit of pacing and beta-blockers in idiopathic repetitive polymorphic ventricular tachycardia

Pacing and Beta-Blockers in Repetitive Polymorphic VT. An 18-year-old woman presented with recurrent exercise-induced syncopal episodes and severe sys tolic dysfunction. ECG monitoring disclosed repetitive polymorphic ventricu lar complexes, paroxysms of bidirectional ventricular tachycardia, and nons ustained bursts of slow polymorphic ventricular tachycardia that increased in length and rate during exercise. Ventricular arrhythmias were refractory to medical treatment, which included verapamil and beta-blockers. Addition of permanent atrial pacing to beta-blocker therapy suppressed the arrhythm ias and reversed systolic impairment in the following months.