Cardiac myosin is a substance present in the heart muscle cells. When the heart is in a normal physiological state, the level of cardiac myosin examined is normal. When there is damage to the heart muscle cells, the cardiac enzymes will be released from the cells, and at this time, when the cardiac enzymes are checked again, they will be found to be significantly elevated. When there is an elevation of cardiac enzymes, it is necessary to be alert to the possibility of myocardial damage caused by heart disease, such as the emergence of viral myocarditis, myocardial infarction, etc., and it is necessary to carry out standardized treatment under the guidance of cardiologists in a timely manner. Because the changes of cardiac enzymes are not reflected immediately after myocardial injury, so, in the early lesion check cardiac enzymes are normal, but also can not completely exclude the heart problem, to be re-examined after 3-4 hours to determine, but also need to be combined with electrocardiograms, cardiac ultrasound, and other tests to determine the synthesis.