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The incidence of perioperative myocardial infarction (MI) was examined in 148 patients with known coronary artery disease (CAD) who underwent 226 noncardiac surgical procedures. In 168 operations in 99 patients who had prior coronary artery bypass grafting (CABG) there were no perioperative MI's whereas in the 49 patients who had not undergone prior CABG who underwent 58 noncardiac operations, there were three MI's (5 percent). The lower (p less than 0.02) incidence of perioperative MI in patients with CAD who had had prior CABG suggests a protective effect for subsequent noncardiac operation, which could not be explained by other differences in cardiac status between the groups. All three MI's occurred in patients with three-vessel CAD, evidence that this should be added to prior MI as a significant risk factor. The study indicates also that patients with prior CABG have less risk of MI during and following anesthesia and noncardiac operation than do patients without CABG who have had a previous MI.
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