Quantitation of CK-MB release: Diagnostic utility in coronary artery bypass grafting

The quantitative release of creatine kinase (CK-MB) into the circulation of 97 patients receiving between three and five distal aorto-coronary bypass grafts was used to quantitate the minimal operative myocardial injury and to determine the diagnostic utility of this measurement in the detection of perioperative myocardial infarction. Independently read electrocardiography (ECG) was used to define infarction. The ± 2 SD confidence range for traumatized heart tissue based on 88 patients without infarction was 0–40.5 g equivalents. Six patients with perioperative myocardial infarction had values significantly above this range. Three patients with indeterminate ECG both released CK-MB significantly above the reference range and were clearly abnormal from a clinical standpoint.