Abstract
Six cardiac patients had His bundle electrograms obtained prior to ventricular pacing. Hours to days after constant pacing, repeat His bundle electrograms were obtained. The H-Q interval increased after pacing in 5 of the 6 patients. The average H-Q interval of 55.8 msec increased to the post pacing value of 67.5 msec (p smaller 0.02). Thus ventricular pacing can produce a conduction delay in the His Purkinje system.
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