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: is an isoenzyme creatine kinase, which mainly exists in the myocardium. It is one of the important markers of myocardial injury and can effectively indicate acute myocardial infarction.
MYO: Mainly present in the myocardium and skeletal muscle. When skeletal muscle and myocardium are damaged, by acute myocardial infarction, excessive exercise or muscle disease, myoglobin is released into the blood. The levels of MYO can not be used as a single diagnostic marker, but in conjunction with cTnI or CK-MB serum levels of MYO can be used to rule out, rather than indicate myocardial infarction.
