Idiopathic Left Ventricular Tachycardia: Significance of Late Diastolic Potential and Purkinje Potential as a Marker for Selection of Successful Ablation Site

摘要

The target site for the radiofrequency (RF) ablation of ILVT can be determined using endocardial mapping by searching for the earliest presystolic Purkinje potential (PP), or a diastolic potential (DP) during tachycardia. We sought the significance of the recording PP and DP potentials as predictors of successful RF ablation. Methods: The study population consisted of 29 consecutive patients (22 men; age 27.97+-12.48) with ILVT undergoing RF ablation at our center. Results: The interval between the PP and the onset of QRS complex (PP-QRS) was 17.05+- 7.04 ms and the interval between DP and the onset of QRS complex (DP-QRS) was 89.44+-39.77 ms. In 18 (62.1%) patients, tachycardia termination was achieved with the RF delivery at the sites with a PP potential (with or without concomitant DP). In 9 (31.8%) patients, the target site of RF ablation was DP recording site.