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J Thorac Cardiovasc Surg 1994;107:1317-1322
© 1994 Mosby, Inc.

SURGERY FOR ACQUIRED HEART DISEASE

Surgical revascularization after acute myocardial infarctionDoes timing make a difference?

Los Angeles, Calif.

From the Department of Cardiac Surgery, Southern California Regional Center, Kaiser Permanente Medical Center, and the University of California, Los Angeles, Calif.

Address for reprints: Colleen F. Sintek, MD, Kaiser Permanente Medical Center, 1505 N. Edgemont St., Los Angeles, CA 90027.

Abstract

At present no consensus exists regarding the timing of surgical revascularization after acute myocardial infarction. Patients admitted with acute myocardial infarction between January 1990 and April 1993 underwent early cardiac catheterization if they had postinfarction ischemia or positive results on a low-level exercise stress test. If indications for surgical intervention were found at the time of catheterization, patients were operated on within 1 or 2 days or were discharged and returned for the operation within 2 to 3 weeks. During this period, we performed 2175 isolated coronary artery bypass graft procedures; 23 patients were operated on within 24 hours of acute myocardial infarction with an operative mortality of 4.4%, 30 patients underwent surgery between 24 and 72 hours after infarction with no deaths, 193 patients were operated on between 3 and 7 days after infarction with an operative mortality of 2.1%, 284 patients underwent revascularization between 1 week and 1 month after infarction with an operative mortality of 1.4%, and the 1645 patients without a recent infarction had a mortality rate of 1.9%. Multivariate statistical analysis was performed to evaluate mortality with these independent variables: reoperative surgery, sex, age, diabetes, timing of infarction, location of infarction, and type (transmural versus subendocardial). Myocardial infarction at any time interval less than 1 month before the operation was not associated with mortality when adjusted by these other risk factors. In addition, no differences were noted in length of stay, stroke rate, or prevalence of renal failure or pulmonary insufficiency. We conclude that nonemergency surgical revascularization can be done safely at any time interval after acute myocardial infarction, certainly after 72 hours, with no increase in operative mortality and acceptable morbidity. (J THORACCARDIOVASCSURG1994;107:1317-22)

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