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His-bundle parasystole masquerading as exercise-induced 2:1 atrioventricular block
1Department of Cardiovascular Medicine, Graduate School of Medicine, University of Tokyo, Japan. kasaokay-int@h.u-tokyo.ac.jp
Journal of Cardiovascular Electrophysiology
|August 22, 2001
Abstract:
We describe a case of symptomatic pseudo-AV block due to His-bundle parasystole masquerading as exercise-induced 2:1 AV block. Electrophysiologic study revealed the presence of His-bundle parasystole, and the fluctuation of parasystolic cycle length could be explained by the concept of modulated parasystole. Modulated parasystole is a possible explanation for maintenance of stable 2:1 AV conduction at an atrial rate of specific range during exercise.