Figure 1.

Substrate mapping using a multipolar catheter in a patient after previous anterior myocardial infarction. A: Bipolar voltage map of the left ventricle in the right anterior oblique view. Voltage is color-coded, with violet representing healthy tissue and gray color dense scar. B: Activation map during sinus rhythm. Blue color corresponds to the late activated regions and areas of late potentials (arrow). A set of ablation lesions encircling the anterior scar led to the elimination of late potentials and suppressed ventricular tachycardia inducibility.