Functional ElectroAnatomiC Isochronal Late Activation Mapping for Empiric VT Ablation Trial

an isochronal late activation mapping (ILAM) display with automated last deflection annotation (EnSite X™) will be used to identify regions of isochronal crowding around a line of conduction block for targeted ablation therapy using a standard irrigated tip catheter (Flexability SE \& Tactiflex catheters)

high-density voltage mapping will serve as the method to display the electroanatomic substrate for extensive and diffuse ablation within the low voltage area (\<1.5 mV).