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The Annals of Thoracic Surgery, Vol 24, 323-329, Copyright © 1977 by The Society of Thoracic Surgeons

ARTICLES

Diagnosis of perioperative myocardial infarction after coronary artery bypass

CH Moore, FT Gordon, JA Allums, TJ Reeves, TA Lombardo, GW Barclay, AB Brady and RL Sweet

The diagnosis of perioperative myocardial infarction (POMI) in patients undergoing coronary artery bypass is uncertain because the criteria of infarction are unclear. Fifty patients who underwent coronary artery bypass were evaluated preoperatively and postoperatively with serial ECGs, creatine phosphokinase (CPK), isoenzyme determinations, and technetium pyrophosphate myocardial scans. Clinical evaluation correlated with exercise testing and postoperative angiography supported the diagnosis in questionable cases. Thirty-five patients (70%) had no evidence of POMI by any criteria, and 2 patients (4%) had unequivocal evidence of infarction by all criteria. Our studies indicate the complexities of diagnosing POMI. We believe that the serially recorded ECG is the most useful diagnostic technique. CPK isoenzyme determinations may be useful but are difficult to interpret in the operative setting. Preoperative cardiac scans are necessary so as to avoid a high incidence of false-positive scans postoperatively. In doubtful cases, postoperative coronary arteriography and left ventricular angiography may provide the most definitive information.




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Copyright © 1977 by The Society of Thoracic Surgeons.