Electrocardiographic Predictors Of Outcomes After Radiofrequency Ablation In Patients With Right-ventricular Outflow Tract Tachycardia

ObjectiveTo evaluate the efficacy and safety of radiofrequency catheter ablation for ventricular ectopic beats originating from right ventricular outflow tract.MethodsThis study included 54 patients(M/F,21/33), mean age(35.4±13.1)years without evidences of structural heart disease. All of them were highly symptomatic, refratory to two or three kinds of antiarrhythmic agents. AL1 ventricular ectopic beats had figure of left bundle branch block with tall R waves in leadsⅡ,Ⅲand AVF. The site of origin was determined by activation mapping for the earliest endocardial activation, and/or by pace mapping for the exact QRS match between pacing and ectopic beat.ResultThe immediate succuss rate is 90.74%(49/54).Before and after ablation,Holter monitoring found that ventricular ectopic beats of succussful patients were (19503.4±9797.2)beats/24h and (20.3±34.9)beats/24h, respectively (P<0.01). During the following-up period of 1-23 months, mean(6.9±6.8)months,7 patients had recurrences. All of patients had no ablation-related complications.ConclusionRadiofrequency catheter ablation is an effective and safe method for ventricular ectopic beats originating from right outflow tract.