BRADYCARDIA-INDUCED POLYMORPHIC VENTRICULAR-TACHYCARDIA AFTER ATRIOVENTRICULAR JUNCTION ABLATION FOR SINUS TACHYCARDIA-INDUCED CARDIOMYOPATHY

In a patient with severe left ventricular dysfunction resulting from c hronic nonparoxysmal sinus tachycardia, rate control and improvement i n left ventricular function were achieved with atrioventricular juncti on ablation and ventricular pacemaker implantation, Within 12 hours af ter the ablation procedure, several episodes of polymorphic ventricula r tachycardia that may have been triggered by the abruptly decreased h eart rate occurred. Recurrence of polymorphic ventricular tachycardia was prevented by an increase in pacing rate.