Intermittent AV conduction disturbances in patients with AV nodal bypass tracts. Possible mechanisms of unusual variant of tachycardia bradycardia syndrome

Agustin Castellanos, R. J. Sung, B. Befeler, A. Mayorga-Cortes, C. Conde, S. M. Mallon, Robert J Myerburg

Research output: Contribution to journalArticle

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Abstract

His bundle recordings were performed in 2 patients in whom AV nodal bypass tracts coexisted with intermittent AV conduction disturbances occurring below the site from which the His bundle deflection was recorded. Case 1 had: (a) tachycardia dependent right bundle branch block, (b) persistent HV prolongation, and (c) bradycardia dependent AV block. Case 2 showed: (a) intra atrial conduction delay, (b) tachycardia dependent left bundle branch block with HV prolongation, (c) bradycardia dependent HV conduction disturbance, (d) tachycardia bradycardia syndrome of an unusual type; the latter presumably resulted, during atrial flutter, from the alternation of rapid AH conduction through the bypass tract with intermittent (complete) distal His bundle block or bilateral bundle branch block.

Original languageEnglish
Pages (from-to)38-43
Number of pages6
JournalBritish Heart Journal
Volume39
Issue number1
StatePublished - Sep 5 1977

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Bundle of His
Bundle-Branch Block
Bradycardia
Tachycardia
Atrial Flutter
Atrioventricular Block

ASJC Scopus subject areas

  • Cardiology and Cardiovascular Medicine

Cite this

Intermittent AV conduction disturbances in patients with AV nodal bypass tracts. Possible mechanisms of unusual variant of tachycardia bradycardia syndrome. / Castellanos, Agustin; Sung, R. J.; Befeler, B.; Mayorga-Cortes, A.; Conde, C.; Mallon, S. M.; Myerburg, Robert J.

In: British Heart Journal, Vol. 39, No. 1, 05.09.1977, p. 38-43.

Research output: Contribution to journalArticle

Castellanos, Agustin ; Sung, R. J. ; Befeler, B. ; Mayorga-Cortes, A. ; Conde, C. ; Mallon, S. M. ; Myerburg, Robert J. / Intermittent AV conduction disturbances in patients with AV nodal bypass tracts. Possible mechanisms of unusual variant of tachycardia bradycardia syndrome. In: British Heart Journal. 1977 ; Vol. 39, No. 1. pp. 38-43.
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