| The superior QRS axis in ostium primum ASD: a proposed mechanism. | |
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MedLine Citation:
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PMID: 125536 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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The influence of abnormal hemodynamics, ventricular hypertrophy, and right bundle branch block on the AQRS was studied pre- and post-operatively in 29 patients with OPSD. The AQRS markedly diminishes with the surgical correction of abnormal hemodynamics and the subsequent resolution of RVH or BVH. With the persistence of ventricular hypertrophy postoperatively or the surgical induction of RBBB, the AQRS either remains unchanged or, in the latter instance, becomes more superior and rightward. The dependence of the superior AQRS on these factors suggests that a left anterior hemiblock is not responsible for this AQRS. In OPSD early activation of the posterobasal region of the left ventricle through an abnormally short posterior fascicle results in a minimal superior AQRS which is then exaggerated in the presence of abnormal hemodynamics, ventricular hypertrophy, or RBBB. Thus, the superior AQRS in OPSD with associated RBBB does not represent a true bifascicular block and has a different natural history and clinical significance. |
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Authors:
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A M Borkon; D R Pieroni; P J Varghese; C S Ho; R D Rowe |
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Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: American heart journal Volume: 90 ISSN: 0002-8703 ISO Abbreviation: Am. Heart J. Publication Date: 1975 Aug |
Date Detail:
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Created Date: 1975-11-01 Completed Date: 1975-11-01 Revised Date: 2007-11-15 |
Medline Journal Info:
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Nlm Unique ID: 0370465 Medline TA: Am Heart J Country: UNITED STATES |
Other Details:
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Languages: eng Pagination: 215-21 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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Adolescent Adult Animals Atrioventricular Node / physiopathology Bundle-Branch Block / physiopathology Cardiac Volume Cardiomegaly / physiopathology Child Dogs Electrocardiography* Female Heart Catheterization Heart Conduction System / physiopathology* Heart Septal Defects, Atrial / physiopathology* Hemodynamics Humans Male Myocardial Contraction Vectorcardiography |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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