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Figure 1 VT Circuit Depiction, Placement of Reconstructed Electrograms, and Resetting Definitions

(A) Schematic representation of an infarct-related ventricular tachycardia (VT) circuit with the central common pathway bordered by presumed scar and a line of functional block. A figure-8 re-entrant native cycle is shown. Reconstructed electrograms were placed parallel and adjacent to this line of block to calculate the local temporal excitable gap within the circuit. (B) A single ventricular extrastimulus arising from the site of stimulation (pacing symbol) preexcites the circuit leading to an extrastimulated wavefront. Collision with the native cycle wavefront in the DP is shown. See text for discussion. DP = diastolic pathway.