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Figure 2 (A) Voltage map of the endocardial surface of the left ventricle (LV) from Patient 7. An extensive low-voltage area is present in the LV outflow area. (B) Two morphologies of ventricular tachycardia (VT).

(C) Pace mapping at sites 1, 2, and 3 labeled in (A) is shown. A good pace match for VT1 is observed at sites 2 and 3, and a long S-QRS delay (200 ms), consistent with slow conduction away from the pacing site, is observed during pace mapping at site 1. A series of radiofrequency lesions (red circles) across this region from the aortic annulus to the dense scar above the mitral annulus abolished both VTs.