Wenckebach phenomenon within the atria

Agustin Castellanos, Ramanuja Iyengar, Abdul S. Agha, Cesar A. Castillo

Research output: Contribution to journalArticlepeer-review

21 Scopus citations


A Wenckebach type of conduction disturbance occurred between the stimulated (high right atrial) site and the recording (low right atrial or coronary sinus) electrodes in two patients. The pacing rates ranged between I58 and I94 a minute. This phnomenon (also observed by Lewis, Feil, and Stroud, 1918-1920) was manifested by a gradual prolongation of the stimulus-to-atrial electrogram intervals until one stimulus failed to reach the recording electrodes. The localization of the site of delay and block could be made exclusively from the intracardiac recordings, since the surface leads showed what appeared to have been only an AV nodal Wenckebach. In Case 2 the intraand interatrial as well as the atrioventricular conduction patterns were studied during intermittent paired high right atrial pacing. Though this patient had complete right bundle-branch block and left anterior hemiblock, the major area of delay was in the atria. The full recovery period of the latter occurred at a longer StI-St2 interval than that of the AV node or His Purkinje system.

Original languageEnglish (US)
Pages (from-to)1121-1126
Number of pages6
Issue number11
StatePublished - 1972
Externally publishedYes

ASJC Scopus subject areas

  • Cardiology and Cardiovascular Medicine


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