Table 3. Diagnosis of perioperative myocardial infarction (MI).

Universal definition of MI (Type 5 MI)16	Definition of MI SYNTAX study 17	Definition of MI used in present study
Increase of biomarkers greater than 5x99th percentile upper reference limit during first 72 h following CABG; Pathological Q-waves or new left bundle-branch block, or angiographically documented new graft or native coronary artery occlusion, or imaging evidence of new loss of viable myocardium	Withinthefirst7dayspostintervention (PCIorCABG): Either new, abnormal Q waves and 1 ratio of peak creatine kinase–MB (CK-MB)/peak total CK >10% or new, abnormal Q-waves and 1 plasma level of CK-MB 5× upper limit for normal; 7daysafteranyinterventionprocedure (PCIorCABG): either new, abnormal Q waves or enzyme changes defined as more than 10% of the ratio of peak CK-MB/peak total CK on one or more than one sample (if no ratio is available—one or more than 1 plasma level of CK-MB 5× upper limit for normal)	2 or more of the 3 following criteria within the first 7 days following CABG:1. new Q-wave or new left bundle-branch block compared to the preoperative echocardiography (ECG); 2. creatine kinase-MB (CK-MB) >60 mg/l; 3. postoperative severe wall motion abnormalities in ECG corresponding with ischemic ECG changes or angiographically documented new graft or native coronary artery occlusion or myocardial necrosis diagnosed by autopsy

PCI, percutaneous coronary intervention; CABG, coronary artery bypass grafting