ELECTROCARDIOGRAPHS CHARACTERISTICS OFIDIOPATHIC VENTRICULAR TACHYCARRHYTHMIAORIGINATING FROM THE RIGHT VENTRICULAR INFLOWTRACT

摘要

Idiopathic ventricular tachyarrhythmia (VT) usually arises from right or left ventricular outflow tract (OT). However, there are some right ventricular (RV) VTs originating from RV inflow tract (RVIT). The aim of this study was to clarify electrocardiographic characteristics of VTs originating around tricuspid annulus (TA). Methods and Results: Twenty six patients with RVIT-VT underwent catheter mapping and ablation (10 anteroseptal foci, 7 midseptal foci, 3 posteroseptal foci, 4 anterior foci, 1 lateral focus, and 1 posterior focus around TA). All VTs had tall monophasic R wave in lead I, and taller R wave in lead II than that in lead III. In VTs adjacent to the His-bundle, QS pattern in lead VI despite early precordial transitional zone of lead V2-V3, and taller R wave in lead V5-V6 than that during sinus rhythm were observed. Anteroseptal VTs had R/S ratio>l in lead II and III. Midseptal VTs had R/S ratio>l in lead II and R/S ratio