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Figure 4 Conduction time between the two ventricular sites. Impulses required progressively more time to propagate from the stimulation site to the remote site upon introduction of an increasing number of closely coupled extra-stimuli. No difference in intersite conduction time was found between stimulation at the ventricular tachycardia inducing site (black bar) vs. stimulation at the noninducing site (white bar). *p < 0.05.