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Ann Thorac Surg 1976;21:215-220
© 1976 The Society of Thoracic Surgeons

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Articles

Factors Predictive of Perioperative Myocardial Infarction during Coronary Operations

From the Department of Thoracic and Cardiovascular Surgery, The Medical College of Wisconsin Affiliated Hospitals, Milwaukee, WI.

Accepted for publication August 6, 1975.

^* Address reprint requests to Dr. Flemma, 9800 Bluemound Rd, Milwaukee, WI 53226

The diagnosis of perioperative myocardial infarction (PMI) in our patients was based upon electrocardiography, vectorcardiography, and postoperative enzyme changes. A group of 303 patients operated on between January and September, 1972, formed the basis of this study. Three groups were identified from among these patients. Group A was composed of 90 consecutive patients in whom MI was excluded by all criteria. Group B comprised 25 patients with proved MI and yielded the 8% incidence of MI among our patients. Group C included 34 patients with triple-vessel disease who did not sustain MI.

Significantly more patients sustaining MI had preinfarction angina and severe coronary artery disease. The incidence of MI was also higher in patients with diffuse disease and those in whom the lesions could not be totally bypassed. A statistical correlation with longer pump runs and periods of anoxia was obtained. There was some suggestion that the preoperative location of the hypokinetic segment determined the site of MI in these patients.

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