LAUSR

When attempting to identify the critical sites of reentrant ventricular tachycardia (VT) circuits, the use of a grid catheter can allow the visualization of local ventricular activation around a pacing site during pace mapping and pacing-induced termination of VT even with nonglobal ventricular Introduction A recent study reported the effectiveness of scar-related ventricular tachycardia (VT) ablation guided by functional substrates via high-density mapping using multielectrode catheters. In this study, VT induction was followed by strategic positioning of the catheter on the functional substrate with a pace map match for the target VT morphology or multiple exit sites (MES). These responses to pace mapping are potential surrogates for VT isthmuses of VT reentry, so it can facilitate the rapid identification of the critical sites of VT circuits after VT induction. However, pace mapping cannot differentiate critical isthmuses from adjacent bystanders for VT reentry. capture.