Targeted Ablation to Isolate Scar Channels Causing Ventricular Tachycardia

PROCEDURE

Selective Substrate Isolation

Ablation will be guided by mapping the substrate "from the inside out" by identifying conducting channels as they might be activated during VT. Extensive pace mapping will be performed within scar areas identified during sinus rhythm mapping. The course of these channels will be identified and ablated across the distal portion, just proximal to the exit based on shortest stimulus-to-QRS interval obtained.

Number of participants achieving substrate Isolation with ablation of exit sites

Time frame: Perioperative/Periprocedural: This will be measured at the end of the study ablation procedure only.

Inability to stimulate the ventricle (physiologic parameter) while pacing in the substrate area contained by the ablation lines through each pacemap exit, at sites that were able to stimulate the ventricle prior to ablation. This will be manifest by the absence of a QRS complex resultant from the pacing stimulus. This is a

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