| Supernormal conduction in the left bundle branch. | |
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MedLine Citation:
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PMID: 7517281 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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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. |
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Authors:
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G Oreto; J L Smeets; L M Rodriguez; C Timmermans; H J Wellens |
Publication Detail:
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Type: Case Reports; Journal Article |
Journal Detail:
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Title: Journal of cardiovascular electrophysiology Volume: 5 ISSN: 1045-3873 ISO Abbreviation: J. Cardiovasc. Electrophysiol. Publication Date: 1994 Apr |
Date Detail:
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Created Date: 1994-08-01 Completed Date: 1994-08-01 Revised Date: 2004-11-17 |
Medline Journal Info:
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Nlm Unique ID: 9010756 Medline TA: J Cardiovasc Electrophysiol Country: UNITED STATES |
Other Details:
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Languages: eng Pagination: 345-9 Citation Subset: IM |
Affiliation:
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Department of Cardiology, Academic Hospital, Maastricht, The Netherlands. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Bundle-Branch Block
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etiology,
physiopathology* Cardiac Complexes, Premature / complications Cardiac Pacing, Artificial Electrocardiography Female Heart Atria Heart Conduction System / physiopathology* Humans Middle Aged Reference Values Tachycardia / complications |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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