In patients with myocardial ischemia, the degree of myocardial ischemia can be assessed by activity plate as well as by cardiac ECT, as a way to determine whether the heart shows signs of significant myocardial ischemia under physical load, as well as myocardial activity. In addition, patients can be hospitalized for coronary angiography, which is a minimally invasive procedure that examines the three coronary arteries on the surface of the heart for one or more stenoses. If the stenosis exceeds 50%, a clear diagnosis of coronary artery disease can be made, and such patients tend to have more severe myocardial ischemia. If the stenosis is more than 70%-75%, it can be clear that the patient should have a stent implanted to open the narrowed vessel. For patients with myocardial ischemia, chest pain and tightness can be significantly controlled after regular medication is taken, indicating that myocardial ischemia is not serious in such patients. For precise assessment, active plate and cardiac ECT can be done. If the patients usually have very serious degree of chest tightness and chest pain and more frequent episodes, they can be exempted from the above two examinations and go directly to the hospital for coronary angiography and, if necessary, implant stents to open the narrowed blood vessels. When the condition is stable, the above two examinations will be done at an optional stage.