| Endocardial activation of left bundle branch block. | |
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MedLine Citation:
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PMID: 6705167 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Endocardial catheter mapping was performed in 18 patients with left bundle branch block (LBBB). Four patients had no organic heart disease (group I), six had cardiomyopathy (group II), and eight had coronary artery disease and previous infarction (group III). Twelve patients had one septal site of left ventricular endocardial breakthrough, while six had two left ventricular endocardial breakthrough sites, with one site always being septal. There was no significant difference among the groups with respect to time of left ventricular breakthrough (group I, 44 msec after the onset of the QRS complex; group II, 58 msec; and group III, 51 msec). Total left ventricular endocardial activation time was significantly longer in group III (119 msec) than group I (81 msec; p less than .05) and group II (61 msec; p less than .001). Duration of total right ventricular endocardial activation was 36 msec (seven patients). The final site of right ventricular activation was at 44 msec after the onset of the QRS complex. We conclude that (1) right ventricular activation occurs before initiation of left ventricular activation in patients with LBBB, (2) left ventricular endocardial activation in patients with LBBB most likely occurs as a result of right-to-left transseptal activation, (3) left ventricular endocardial activation sequence in patients with LBBB is heterogeneous, and (4) patients with coronary artery disease and LBBB have significantly longer total left ventricular endocardial activation times than patients with no organic heart disease or those with cardiomyopathies. |
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Authors:
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J A Vassallo; D M Cassidy; F E Marchlinski; A E Buxton; H L Waxman; J U Doherty; M E Josephson |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, P.H.S. |
Journal Detail:
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Title: Circulation Volume: 69 ISSN: 0009-7322 ISO Abbreviation: Circulation Publication Date: 1984 May |
Date Detail:
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Created Date: 1984-05-16 Completed Date: 1984-05-16 Revised Date: 2007-11-14 |
Medline Journal Info:
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Nlm Unique ID: 0147763 Medline TA: Circulation Country: UNITED STATES |
Other Details:
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Languages: eng Pagination: 914-23 Citation Subset: AIM; IM |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Adult Aged Bundle-Branch Block / physiopathology* Electrocardiography Endocardium / physiopathology* Female Heart / physiopathology* Heart Diseases / physiopathology Humans Male Middle Aged Myocardial Infarction / physiopathology |
| Grant Support | |
ID/Acronym/Agency:
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HL00361/HL/NHLBI NIH HHS; HL24278/HL/NHLBI NIH HHS |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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