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Ann Thorac Surg 1986;41:378-386
© 1986 The Society of Thoracic Surgeons

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Articles

Evaluation of Serum Creatine Kinase and Lactate Dehydrogenase in Experimental Myocardial Infarction, Atriotomies, and Thoracotomies

Division of Surgery, Walter Reed Army Institute of Research, and the Thoracic Surgery Service, Walter Reed Army Medical Center, Washington, DC, and the Department of Surgery, the Uniformed Services University of the Health Sciences, Bethesda, MD

Accepted for publication June 19, 1985.

^* Address reprint requests to Dr. Graeber, Division of Surgery, Walter Reed Army Institute of Research, Walter Reed Army Medical Center, Washington, DC 20307-5100

Myocardial infarction causes elevation of the serum myocardial-associated isoenzyme of creatine kinase (CK-MB) and a serum isoenzyme of lactate dehydrogenase (LDH₁). Since atrial myocardium has as much CK-MB as ventricular myocardium, surgical manipulation of the atrium could cause elevation of serum CK-MB in the postoperative period. The distribution of LDH isoenzymes is different between atrial and ventricular myocardium. Hence, surgical procedures on the atrium could, theoretically, cause different changes in serum LDH isoenzymes than those seen after acute myocardial infarction. This study was conducted to ascertain whether surgical manipulation of the atrium could cause changes in these two serum enzyme systems that might be confused with those seen after acute myocardial infarction. Right thoracotomies were performed on 20 dogs. Each dog then was assigned randomly to one of four groups: thoracotomy (control), placement of atrial pursestring sutures, atriotomy, or acute perioperative myocardial infarction. Serum total and isoenzyme distributions of CK and LDH were measured for 48 hours in all animals. The results suggest that significant elevations of serum CK-MB occurred even after small atriotomies. Confirmation of a ventricular myocardial origin of postoperative serum CK-MB bands was obtained by analysis of serum LDH isoenzymes in that the ratio of LDH₁ to LDH₂ and the absolute value of serum LDH₁ became elevated only after acute perioperative myocardial infarction and not after atriotomy.

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