- MI is defined based on at least 2 of 3 MI criteria confirmed by: 1) ischemic symptoms ≥30 minutes, 2) cardiac serum marker elevation (creatine kinase (CK) ≥2x upper limit of normal and CK-MB elevated above the upper limit of the laboratory normal) or troponin T, or troponin I elevated at least twice the upper limit of normal, 3) EKG: New Q-waves of ≥0.03 sec and/or 1/3 of QRS complex in ≥2 related EKG leads. If cardiac serum markers are elevated (2), any one of the following EKG findings satisfy inclusion criteria; new ST-T changes (ST elevation or depression), new left bundle-branch block (LBBB), loss of R-wave voltage ≥50% in ≥2 related leads or deep T wave inversions ≥3mm in ≥2 leads.