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Figure 1 Example of an isolated potential recorded within a posterior left ventricular scar. The isolated potential (arrow) is separated from the ventricular electrogram by an isoelectric segment of 120 ms. The amplitude of the isolated potential is 0.035 mV. The electrogram width is 260 ms. In this patient there were 11 different inducible ventricular tachycardias (VTs); after the ablation procedure and the displayed lesions (Fig. 2; 20 radiofrequency lesions of 60 s were delivered), these VTs were no longer inducible. Map dist = distal electrode pair of the mapping catheter.