It is a group of clinical syndrome of angina pectoris caused by insufficient coronary blood supply, which is a contradiction between the blood supply of coronary artery and the blood demand of myocardium. So, what tests should be done when a patient has symptoms of anterior chest pressure pain? The following is a brief introduction: 1. ECG ECG is the most commonly used non-invasive test to diagnose myocardial ischemia. Patients whose ECG is within the normal range at rest can be considered for dynamic ECG recording and/or cardiac stress test. 2.X-ray There may be no abnormal findings, but some patients may see changes such as enlarged heart shadow, widened aorta, and pulmonary congestion. 3.Radionuclide Commonly used radionuclides are 201Tl or 99mTc-MIBI, which can make the normal myocardium appear but not the ischemic area. 4.Selective coronary angiography By injecting contrast into the coronary arteries, it can show the obstructive lesions in the left and right coronary arteries and their branches. Although it is an invasive test, it is also the most valuable test to reflect the atherosclerotic lesions of coronary arteries.