Evaluation of noninvasive isochronal late activation mapping in scar-related ventricular tachycardia with electrocardiographic imaging against contact mapping.

Background: Deceleration zones (DZs) represent important ablation targets in scar-related ventricular tachycardias (VTs). Novel electrocardiographic imaging (ECGI) techniques could identify DZs instantly and noninvasively.

Objective: We aimed to evaluate a novel ECGI last deflection detection algorithm for noninvasive isochronal late activation substrate mapping in scar-related VT procedures against electroanatomic mapping (EAM).