Evolution of deceleration zones during VT ablation and relation with cardiac magnetic resonance

Abstract Funding Acknowledgements Type of funding sources: None. Background A new functional mapping strategy based on targeting deceleration zones (DZs) has become one the most commonly used strategies within armamentarium substrate-based ablation methods for ventricular tachycardia (VT) in patients with structural heart disease. The classic conduction channels detected by voltage can be accurately determined cardiac magnetic resonance (CMR). Objectives To analyze evolution DZs during and their correlation CMR. Methods Forty-two consecutive scar-related VT undergoing after CMR (October 2018-December 2020) were included (medium age 65.3±11.8 years; 94.7% male; 73.7% ischemic disease). Baseline isochronal late activation remaps analyzed. comparison between conducting (CMR-CCs) was realized. Patients prospectively followed recurrence year. Results Overall, 95 analyzed, 93.68% which correlated CMR-CCs: 44.8% located middle segment 55.2% entrance/exit channel. Remapping performed 91.7% (1remap: 33.3%, 2remaps: 55.6% 3remaps: 2.8%). Regarding DZs, 72.2% disappeared first set, 14.13% not ablated at end procedure. total 32.5% a CMR-CCs already detected, 17.5% associated an unmasked CMR-CCs. One-year 22.9%. Conclusions are highly In addition, remapping lead to identification hidden substrate initially identified electroanatomic but