| Inability of exercise-induced R wave changes to predict coronary artery disease. | |
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MedLine Citation:
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PMID: 7064817 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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To determine the value of exercise-induced R wave changes in diagnosing coronary disease 200 patients undergoing coronary angiography were studied with 16 lead precordial exercise mapping. R wave amplitude was calculated before and immediately after exercise as the sum of R in all 16 leads, the sum of the R waves in the left plus the S waves in the right precordial leads, as well as the sum of the R waves only in those leads that manifested S-T depression. Coronary artery disease was found in 154 patients, S-T depression developed in 122 (sensitivity 79 percent); the sum of R increased or remained unchanged in 61 and decreased in 93 (sensitivity 40 percent). Forty-six patients did not have coronary artery disease; S-T depression developed in 5 (specificity 89 percent); the sum of R increased or was unchanged in 30 and decreased in 16 (specificity 35 percent). Similar results were obtained using the other criteria for calculating R wave amplitude. Exercise-induced S-T depression was identified in 5. 1 +/- 2.6 (mean +/- standard deviation) of the 16 precordial leads and in 2.0 +/- 1. 1 of the chest leads of the standard electrocardiogram (p less than 0.01). Thus, electrocardiographic alterations found in the standard chest leads represent only a small variable proportion of the total projection. When the whole precordial area was analyzed, R wave changes were so unpredictable that they could not be used in the diagnosis of coronary disease. |
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Authors:
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K Fox; D England; A Jonathan; A Selwyn |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: The American journal of cardiology Volume: 49 ISSN: 0002-9149 ISO Abbreviation: Am. J. Cardiol. Publication Date: 1982 Mar |
Date Detail:
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Created Date: 1982-05-21 Completed Date: 1982-05-21 Revised Date: 2006-11-15 |
Medline Journal Info:
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Nlm Unique ID: 0207277 Medline TA: Am J Cardiol Country: UNITED STATES |
Other Details:
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Languages: eng Pagination: 674-9 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 Coronary Angiography Coronary Disease / diagnosis* Diagnosis, Differential Exercise Test* Female Heart Ventricles / radiography Humans Male Middle Aged |
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