Document Detail


Identification of severe coronary artery disease in patients with a single abnormal coronary territory on exercise thallium-201 imaging: the importance of clinical and exercise variables.
MedLine Citation:
PMID:  10676678     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
OBJECTIVES: The aim of this study was to determine which clinical, exercise and thallium variables can aid in the identification of three-vessel or left main coronary artery disease (3VLMD) in patients with one abnormal coronary territory (either a reversible or fixed defect) on exercise thallium testing and to test the prognostic value of these variables. BACKGROUND: Although the sensitivity of detection of coronary artery disease by thallium-201 imaging is high, the actual detection of 3VLMD by thallium tomographic images alone is not optimal. METHODS: A multivariate model for prediction of 3VLMD was developed from several clinical, exercise and thallium-201 variables in a training population of 264 patients who had one abnormal coronary artery territory on exercise thallium testing and had undergone coronary angiography. Using this model, patients were stratified into risk groups for prediction of 3VLMD. A separate validation cohort of 474 consecutive patients who were treated initially with medical therapy and who had one abnormal coronary territory were divided into identical risk groupings by the variables derived from the training population, and they were followed for a median of 7.0 years to evaluate the prognostic value of this model. RESULTS: The prevalence of 3VLMD was 26% in the training population despite one abnormal thallium coronary territory. Four clinical and exercise variables--diabetes, hypertension, magnitude of ST segment depression, and exercise rate-pressure product-were found to be independent predictors of 3VLMD. In the training population, the prevalence of 3VLMD in low-, intermediate- and high-risk groups was 15%, 22% and 51%, respectively. When the multivariate model was applied to the validation population, the eight-year overall survival rates in the low-, intermediate- and high-risk groups were 89%, 73% and 75%, respectively (p < 0.001). CONCLUSIONS: A substantial proportion of patients with one abnormal thallium coronary territory have 3VLMD with subsequent divergent outcomes based upon risk stratification by clinical and exercise variables. Consequently, the finding of only a single abnormal coronary territory by thallium-201 perfusion imaging does not necessarily confer a benign prognosis in the absence of consideration of nonimaging variables.
Authors:
J M Kwok; T F Christian; T D Miller; D O Hodge; R J Gibbons
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of the American College of Cardiology     Volume:  35     ISSN:  0735-1097     ISO Abbreviation:  J. Am. Coll. Cardiol.     Publication Date:  2000 Feb 
Date Detail:
Created Date:  2000-02-29     Completed Date:  2000-02-29     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  8301365     Medline TA:  J Am Coll Cardiol     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  335-44     Citation Subset:  AIM; IM    
Affiliation:
Department of Internal Medicine, Mayo Clinic and Mayo Foundation, Rochester, Minnesota 55902, USA.
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MeSH Terms
Descriptor/Qualifier:
Coronary Angiography
Coronary Disease / etiology,  radiography,  radionuclide imaging*
Coronary Vessel Anomalies / complications,  radiography,  radionuclide imaging*
Exercise Test
Female
Humans
Male
Middle Aged
Predictive Value of Tests
Reproducibility of Results
Retrospective Studies
Severity of Illness Index
Thallium Radioisotopes / diagnostic use*
Tomography, Emission-Computed, Single-Photon*
Chemical
Reg. No./Substance:
0/Thallium Radioisotopes
Comments/Corrections
Comment In:
J Am Coll Cardiol. 2000 Dec;36(7):2352-3   [PMID:  11127485 ]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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