cTnI: It is a contractile protein that exists only in the myocardium. It is one of the three subunits of troponin complex (I, T, C), and combines with tropomyosin in the filaments of myofibrils to form actin.
CK-MB: a form of creatine kinase isoenzyme, which mainly exists in the myocardium. It is one of the important markers of myocardial injury and can effectively diagnose acute myocardial infarction.
Myo: Mainly present in the myocardium and skeletal muscle. When skeletal muscle and myocardium are damaged (acute myocardial infarction), excessive exercise and muscle diseases, myoglobin is released into the blood. The levels of MYO can therefore not be used as a single diagnostic marker, but in conjunction with the troponins or CK-MB. Thus, serum levels of MYO can be used to rule out, rather than diagnose, myocardial infarction