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Figure 5 Dispersion of repolarization between the two ventricular sites. During baseline (S1) stimulation at the ventricular tachycardia-inducing site repolarization dispersion was larger than during stimulation at the noninducing site. Extra-stimulus application increased the dispersion of repolarization at both sites. Maximal dispersion produced by extra-stimulation at the noninducing site (white bar) only approached the amount of repolarization dispersion that was present during baseline stimulation at the inducing site (black bar). The largest repolarization dispersion was measured during extra-stimulation at the inducing site upon ventricular tachycardia initiation. *p < 0.05.