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Figure 3 Electrophysiological Characterization of Inducible VT in a Representative Animal

(A) A 12-lead surface electrocardiogram during ventricular tachycardia (VT) shows a superior axis and right bundle branch block pattern, which is compatible with distal anterior origin in the pig heart. (B) A 64-polar endocardial basket catheter indicates the earliest endocardial VT activation site (arrow). The corresponding electrode on the basket catheter, as identified fluoroscopically, is marked by a circle and indicates a distal anterior location.