Diagnosis of Perioperative Myocardial Infarction with Measurement of Cardiac Troponin I
Jesse E. Adams, Gregorio A. Sicard, Brent T. Allen, Keith H. Bridwell, Lawrence G. Lenke, Victor G. Davila-Roman, Geza S. Bodor, Jack H. Ladenson, and Allan S. Jaffe
Background Perioperative myocardial infarction is the most commoncause of morbidity and mortality in patients who have had noncardiacsurgery, but its diagnosis can be difficult. The present studywas designed to determine whether the measurement of serum levelsof cardiac troponin I, a highly sensitive and specific markerfor cardiac injury, would help establish the diagnosis of myocardialinfarction.
Methods We obtained preoperative measurements of MB creatinekinase, total creatine kinase, and cardiac troponin I, in additionto base-line electrocardiograms and two-dimensional echocardiograms,in 96 patients undergoing vascular surgery and 12 undergoingspinal surgery. Blood samples were obtained every 6 hours forat least the first 36 hours after surgery, and electrocardiogramswere obtained daily; a second echocardiogram was obtained approximatelythree days after surgery. The appearance of a new abnormalityin segmental-wall motion on the postoperative echocardiogram(that is, an abnormality that had not been seen on the preoperativeechocardiogram) was considered to be indicative of perioperativeinfarction.
Results Eight patients who underwent vascular surgery had newabnormalities in segmental-wall motion and received a diagnosisof perioperative infarction. All eight had elevations of cardiactroponin I, and six had elevations of MB creatine kinase. Ofthe 100 patients without perioperative infarction detected byechocardiography, 19 had elevations of MB creatine kinase, and1 had a slight elevation of cardiac troponin I.
Conclusions The measurement of cardiac troponin I is a sensitiveand specific method for the diagnosis of perioperative myocardialinfarction. It avoids the high incidence of false diagnosesassociated with the use of MB creatine kinase as a diagnosticmarker.
Source Information
From the Cardiovascular Division (J.E.A., V.G.D.-R., A.S.J.), the Department of Surgery, Vascular Surgery Section (G.A.S., B.T.A.), the Division of Orthopedic Surgery (K.H.B., L.G.L.), and the Division of Laboratory Medicine (J.H.L.), Washington University School of Medicine, St. Louis; and the Division of Laboratory Medicine, Vanderbilt University, Nashville (G.S.B.).
Address reprint requests to Dr. Jaffe at Washington University School of Medicine, 660 S. Euclid, Box 8086, St. Louis, MO 63110.
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