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Mitral Regurgitation in Early Myocardial Infarction: Incidence, Clinical Detection, and Prognostic Implications

Kenneth G. Lehmann, MD; Charles K. Francis, MD; Harold T. Dodge, MD, TIMI Study Group*
[+] Article, Author, and Disclosure Information

Grant Support: By the National Heart, Lung, and Blood Institute.

Requests for Reprints: Kenneth G. Lehmann, MD, DVA Medical Center (111C), 1660 South Columbian Way, Seattle, WA 98108.

Current Author Addresses: Dr. Lehmann: DVA Medical Center (111C), 1660 South Columbian Way, Seattle, WA 98108.

Dr. Francis: Harlem Hospital (KP 14101), 506 Lenox Avenue, New York, NY, 10037.

Dr. Dodge: University Hospital (RG-22), Seattle, WA 98195.

From Yale University School of Medicine, New Haven, Connecticut; and University of Washington School of Medicine, Seattle, Washington. For current author addresses, see end of text.*For members of the Thrombolysis in Myocardial Infarction (TIMI) Study Group, see the Appendix.

© 1992 American College of PhysiciansAmerican College of Physicians

Ann Intern Med. 1992;117(1):10-17. doi:10.7326/0003-4819-117-1-10
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Objective: To investigate mitral regurgitation occurring early in the course of acute myocardial infarction with respect to its incidence, the impact of infarct size and location, the accuracy of clinical detection, the contribution of global and regional left ventricular performance, and its influence on prognosis.

Design: Prospective observational study derived from patients entering Phase I of the Thrombolysis in Myocardial Infarction (TIMI) trial.

Setting: Multicenter trial involving 13 universityaffiliated medical centers.

Patients: A total of 206 patients studied within 7 hours of symptom onset during their first myocardial infarction.

Measurements: Contrast left ventriculography was used to document mitral regurgitation.

Results: Mitral regurgitation was present in 27 patients (13%). Although the presence of regurgitation correlated with the site of infarction (20 of 27 had anterior infarctions) and the number of akinetic chords, it was not statistically related to the peak creatine kinase value or to left ventricular chamber size or filling pressure. A murmur of mitral regurgitation was heard in only 2 patients (1 incorrectly). The presence of early mitral regurgitation predicted cardiovascular mortality at 1 year by univariate (relative risk, 12.2; 95% Cl, 3.5 to 42; P < 0.0001) and multivariate (relative risk, 7.5; Cl, 2.0 to 28.6; P = 0.0008) analyses.

Conclusions: Mitral regurgitation in early myocardial infarction is generally clinically "silent," is more common in anterior infarction, is associated with regional dysfunction but not early ventricular dilation or peak enzyme release, and is an important predictor of cardiovascular mortality.





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