Successful catheter ablation in a patient with polymorphic ventricular tachycardia

We describe a patient with polymorphic ventricular tachycardia (PVT)/ventri cular fibrillation (VF) without organic heart disease who was cured by radi ofrequency catheter ablation. The patient was a 65-year-old woman with a 10 -year history of recurrent syncope, There was no evidence of organic heart disease, and the QT interval during sinus rhythm was borderline normal (cor rected QT interval = 0.45 sec(1/2)). ECG recording during syncope showed PV T, On one occasion, PVT degenerated into VF, This PVT was always induced by a premature ventricular complex (PVC) originating from the right ventricul ar (RV) outflow tract. Rapid pacing (220 beats/min) at the site of PVC orig in reproduced polymorphic change of the QRS wave on surface ECG that was si milar to PVT, This suggests that the PVT originated from a single focus in the RV outflow tract. Catheter ablation was performed at the site of PVC or igin. During 18-month follow-up, PVT/VF was not documented.