Myocardial ischemia is usually referred to as insufficient coronary artery blood supply, in this case is also known as angina pectoris, the examination methods are as follows: 1, routine electrocardiogram, but the electrocardiogram is in the attack to find the problem, if not the attack electrocardiogram is normal, the next need to do 24-hour ambulatory electrocardiogram, to see in plain daily life there is no ST-segment changes, and the performance of myocardial ischemia; 2, do activity plate, activity plate The most standard is to do coronary angiography, because coronary angiography is a traumatic examination, so the first choice is coronary CT, coronary CT can clarify whether there is If there is fixed stenosis of coronary artery, then coronary angiography can be done to further clarify whether there is indication for stent implantation.