Radiofrequency Catheter Ablation of Ventricular Ectopic Beat Originating in the Right Outflow Tract.

Objective To appraise the efficacy and safety of radiofrequency catheter ablation(RFCA) for ventricular ectopic beat originating in the right ouflow tract.Methods Fifty-two patients(28 male and 24 female) were selected to undergo RFCA for ventricular ectopic beat originating in the right outflow tract.Their mean age was 45.1 years(15～67) with the mean course of 6.8 years(3～14).All of them were highly symptomatic,refractory to several antiarrhythmic agents and without evidences of structural heart disease.All ventricular ectopic beat had figure of left bundle branch block with tall R waves in leads Ⅱ,Ⅲ and AVF.The site of origin was determined by pace Mepping.Results The immediate success rate was 94%(49/52).Before and after ablation Holter monitoring found that ventricular ectopic beats were 11250～37460 beats/24h and 0～1120 beats/24h,respectively(P0.001).During the follow-up period of 2～32 months,no patient had recurrences.Conclusions RFCA used in treating refractory ventricular ectopic beat at right outflow tract is safe and reliable.