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Key Points Hemodynamic instability precludes detailed activation and entrainment mapping in a significant percentage of patients presenting for scar-related ventricular tachycardia (Sc-VT) ablation. As a result, ablation of Sc-VT is often limited to substrate mapping and ablation performed in sinus…

Key Points Substrate mapping is performed to delineate the scarred myocardium in unstable ventricular tachycardia (VT). For ventricular fibrillation (VF), mapping is performed to identify the focal origin of triggers. Targets for substrate ablation include VT exit sites identified by…