Henry Ford Hospital Medical Journal


Technedum 99m stannous pyrophosphate (TcPyP) myocardial scans were obtained in 42 selected nonconsecutive patients within 12 days following open heart operations for both valve replacement (19 patients) and coronary bypass (23 patients) procedures. The scans were correlated with elevation of serum lactic dehydrogenase, glutamic oxalacetic transaminase and the electrocardiograms obtained serially in the postoperative period. TcPyP scan was more specific than enzyme studies and it was more sensitive than the electrocardiogram. All new Q waves were associated with a positive scan but there were five positive scans which were not associated with new Q waves. Myotomy and direct surgical trauma to the left ventricle did not cause positive scanning. Evidence for infarction by myocardial scan was observed in both valvular and coronary bypass patients. The technique has improved understanding of the occurrence of intraoperative myocardial infarctions.