Background: Radiofrequency catheter ablation (RFCA) of idiopathic left ventricular tachycardia (ILVT) can be performed successfully, with determination of the ablation site based on the identification of success parameters (a presystolic Purkinje potential, early endocardial activation or pace mapping). However, it not clear which parameters were more associated with success and could prevent recurrence of ILVT. The purpose of this study was to determine the predictors for success and recurrence of ILVT after RFCA. Methods: Between January 1996 and June 2005, 71 patients had undergone EPS for ILVT. RFCA was performed in 62 patients (49 male, 13 female, mean age 31.8 짹 14.5 years), excluding 9 without inducible VT. Three success parameters were compared between success and failure group. Additional parameters were analyzed to predict the recurrence of ILVT. Results: In total 62 ILVT, RFCA was performed with success in 56 (90.3%) patients. A presystolic Purkinje potential was more frequently observed in success group (54, 96%) than failure group (2, 33%, p=0.001). Endocardial activation time during ILVT was not different between two groups (-25 짹 11.5ms vs. -22.4 짹 8.3ms, p=0.27). The concordance rate during pace mapping was similar between two groups (n=54, 95% vs. n=5, 83%, p=0.55). Among 56 patients with successful RFCA, 6 (10.7%) patient recurred. Success parameters did not predict the recurrence (table). Axis, ablation site, RFCA number and time also did not show significant difference between no-recurrence and recurrence group. Conclusion: Among success parameters, a Purkinje potential was important to predict RFCA success in ILVT. However, these parameters did not predict the ILVT recurrence.
# Comparison of success parameters between no-recurrence and recurrence group.