PMID: 7517281Apr 1, 1994Paper

Supernormal conduction in the left bundle branch

Journal of Cardiovascular Electrophysiology
G OretoH Wellens

Abstract

This report describes a patient with tachycardia-dependent left bundle branch block (LBBB) and atrial extrasystoles, some of which were followed by an unexpectedly narrow QRS complex. His-bundle recordings and premature atrial stimulation were performed to analyze the mechanism underlying the normalized intraventricular conduction of some of the early atrial impulses. The results suggested the presence of supernormal conduction in the left bundle branch (LBB), because: (1) the HV interval was identical in LBBB complexes and in early narrow QRS complexes; (2) during single test stimulation using different paced atrial cycle lengths, there was a well-defined range of H1H2 intervals resulting in normalization of intraventricular conduction; and (3) atrial pacing with a cycle length of 500 msec resulted in alternation between wide and narrow QRS complexes. These findings rule out alternative mechanisms that could explain the unexpectedly normal intraventricular conduction of early impulses.

References

Sep 1, 1992·Pacing and Clinical Electrophysiology : PACE·F LuzzaI M Scimone
Apr 1, 1985·Journal of Electrocardiology·G OretoL Schamroth
Mar 1, 1973·The American Journal of Cardiology·J J GallagherS H Lau
Aug 1, 1972·Circulation·R A MassumiD T Mason
Jan 1, 1971·Journal of Electrocardiology·I D'Cruz
May 1, 1969·British Heart Journal·L Schamroth
Apr 1, 1970·Chest·M J Mihalick, C Fisch
Dec 1, 1980·American Heart Journal·L Schamroth
Jun 1, 1993·Journal of Cardiovascular Electrophysiology·E N MooreC Fisch
Jul 1, 1968·Circulation·G K MoeJ Merideth

Citations

May 11, 2004·Journal of Electrocardiology·Vincenzo CarboneMaria Pia Calabrò
Jun 27, 2015·International Journal of Cardiology·F LuzzaPietro Pugliatti
May 13, 2015·International Journal of Cardiology·F LuzzaPietro Pugliatti
Jul 19, 2011·Annals of Noninvasive Electrocardiology : the Official Journal of the International Society for Holter and Noninvasive Electrocardiology, Inc·Rituparna S ShindeG Oreto
Jan 3, 2006·Journal of Electrocardiology·F LuzzaG Oreto
Sep 10, 2016·Journal of Electrocardiology·Acácio Fernandes-CardosoAndrés Ricardo Pérez-Riera
Feb 25, 1998·Journal of Cardiovascular Electrophysiology·G Oreto, Maria Pia Calabrò

Related Concepts

Anterior Fascicular Block
Cardiac Pacing, Artificial
Electrocardiographic Recorders
Premature Cardiac Complex
Right Atrial Structure
Cardiac Conduction System
Tachycardia

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