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The strength-interval relation between the intensity of premature stimulus and the ventricular effective refractory period (VERP) has been well characterized. The effects of variation in the intensity of the basic drive train stimuli (S1) on VERP are not as well defined. This relation was studied in 44 patients undergoing clinically indicated electrophysiological study.

Effects of drive train stimulus intensity on ventricular refractoriness in humans.