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Figure 2 Substrate mapping and radiofrequency (RF) ablation in Patient #5 (a patient with both stable and unstable ventricular tachycardias [VTs]. A large anteroseptal and apical aneurysm is seen in the 30° right anterior oblique view in both the bipolar voltage (top) and EGM duration (middle) maps obtained during sinus rhythm. Pace-mapping (arrow) produced a QRS morphology similar to the predominant VT (cycle length [CL] 643 ms). Concealed entrainment was noted at this point, with a postpacing interval 25 ms greater than the VT CL. Ventricular tachycardia could not be induced when mechanical pressure was applied just inferior to this site (green dot). After the placement of two linear lesions, only an SWVT (CL 311 ms) that rapidly degenerated into VF was induced with programmed stimulation (right ventricular apex: 400/300/290/280).
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