MB and ST Elevation Myocardial Infarction: Creatine kinase isoenzymes (CK-MB), myoglobin (Mb) and troponin are routinely used in the management of STEMI and non-ST elevation myocardial infarction (NSTEMI).[3] In patients with atypical clinical symptoms and NSTEMI, the diagnosis must be confirmed by relying on changes in biomarkers of myocardial injury.