Long Term Results of Radio Frequency Ablation of Right Ventricular Outflow Tract Tachycardia

Abstract

Background. Right Ventricular Outflow Tract (RVOT) tachycardia is frequently found in clinical practice. Despite of its good prognosis no need it usually affects the reproductive age (20-40 years) and can be very symptomatic. Radio frequency ablation (RFA) is a recommended therapeutic option of RVOT tachycardia. The aim of this study is to evaluate longterm resultsof RFA in National Cardiovasxular Center Harapan Kita. Method. A retrospective cohort study conducted to subjects with RVOT tachycardia who underwent RFA during period of 2005-2011. Clinical characteristics are revealed from medical record and electrophysiology characteristics are revealed from electrophysiology recording system (PruckaTMandWorkmateTM). ECG morphology assessed by 2 observers using digimatic calliper MitutoyoTM. Patients that received pharmacological therapy act as control group. All patients are observed up to 1 year. Results. Sixty two patients underwent RFA (mean age of 43,56 11,77 year,46 female). ECG morphologies are all left bundle branch blok (LBBB), inferior axis, transtitional zone ? V4. Based on ECG morphology, septal site are majority of cases. Mean EA (earliest activation) is 41,26 16,94 ms, median 39,50 ms. An acute successful rate of RFA is 79%.Long termsuccess rate is 83,9 % as compare to only 40,9% in medical therapy group(RRR 77%, p=0.001). Septal origin site is an independent factor of success of RFA RVOT tachycardia. Conclusion. RFA of RVOT tachycardia is safe and effective with better longterm result as compare to pharmacological therapy.

Keywords

• RVOT tachycardia
• radio frequency ablation