Simultaneous Endocardial and Epicardial Delineation of 3D Reentrant Ventricular Tachycardia.

Background: Mechanisms of scar-related ventricular tachycardia (VT) are largely based on computational and animal models that portray a 2-dimensional view.

Objectives: The authors sought to delineate the human VT circuit with a 3-dimensional perspective from recordings obtained by simultaneous endocardial and epicardial mapping.

Methods: High-resolution mapping was performed during 97 procedures in 89 patients with structural heart disease.

Impact of local ablation on interconnected channels within ventricular scar: mechanistic implications for substrate modification.

Background: The extent to which channels within scar are interconnected is not known. The objective of the study was to evaluate the impact of local ablation of late potentials (LPs) on adjacent and remote areas of slow conduction with simultaneous multipolar mapping.

Methods And Results: Analysis was performed on consecutive patients referred for ablation of scar-mediated ventricular tachycardia with double ventricular access.