Usually coronary artery disease is most likely to cause myocardial ischemia, but symptoms of myocardial ischemia can also occur in other areas of disease. 1, For example, other disease factors of cardiac origin, such as myocarditis, pericarditis, endocarditis, infectious heart disease, and congenital heart disease can cause myocardial ischemia. 2, Diseases of the nervous system, such as patients with cerebrovascular insufficiency of blood supply, acute stroke, and acute cerebral infarction, can also reflexively 3. cardiac neurosis can also cause inadequate blood supply to the heart, or relatively poor ejection capacity of the heart. 4. toxic cardiomyopathy can occur in the case of acute or chronic poisoning, which can also have clinical manifestations of myocardial ischemia.