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Figure 6 A 12-lead electrocardiogram recorded from a 72-year-old man with dilated cardiomyopathy. The patient was paced at a cycle length of 600 ms from either the endocardium (Endo) or an epicardial (Epi) site immediately across the lateral aspect of the left ventricular free wall. During endocardial pacing (left), the QT interval in lead V6 was 444 ms and the T peak–T end interval was 142 ms. Pacing from the epicardium increased these values to 454 ms and 178 ms, respectively, and augmented and widened the T-wave.