Acute myocardial infarction will be chest pain. Once acute myocardial infarction occurs, there will be persistent pressure and cramping sensation behind the sternum and back, which will radiate to the left shoulder, left arm, and even the left pinky and ring finger, and in severe cases, to the heel of the ear and jaw. In case of persistent chest pain, give sublingual nitroglycerin and musk heart pills. In addition, have friends and family members call the 120 emergency number and wait for the arrival of medical staff. During this period, keep the room environment quiet and air circulation. Upon arrival at the hospital, clarify the degree of coronary lumen stenosis through ECG, cardiac ultrasound, and coronary CTA, and give the next step of treatment plan.