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Substrate Ablation of Ventricular Tachycardia: Late Potentials, Scar Dechanneling, Local Abnormal Ventricular Activities, Core Isolation, and Homogenization.

Ventricular arrhythmias are a frequent cause of mortality in patients with ischemic cardiomyopathy and nonischemic cardiomyopathy. Scar-related reentry represents the most common arrhythmia substrate in patients with recurrent episodes of sustained ventricular tachycardia (VT). Initial mapping of scar-related VT circuits is focused on identifying arrhythmogenic tissue. The substrate-based strategies include targeting late potentials, scar dechanneling, local abnormal ventricular activities, core isolation, and homogenization of the scar. Even though substrate-based strategies for VT ablation have shown promising outcomes for patients with structural heart disease related to ischemic cardiomyopathy, the data are scarce for patients with nonischemic substrates.

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