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Effect of Recording Site on Postpacing Interval Measurement During Catheter Mapping and Entrainment of Postinfarction Ventricular Tachycardia

Postpacing Interval and VTCL. Introduction: During entrainment of reentrant ventricular tachycardia (VT), the difference between the postpacing interval (PPI) and the VT cycle length (VTCL) measured at the pacing site is an indication of the conduction time from the pacing site to the reentry circuit. The difference is usually ≤ 30 msec at successful ablation sites. However, electrical noise during pacing sometimes obscures the electrograms recorded directly from the pacing site. The objective of this study is to determine if the PPI‐VTCL difference measured at the mapping catheter electrodes proximal to the stimulating electrode accurately predicts the PPI‐VTCL difference at the stimulating electrode.