Cardiac ultrasound is fine, but myocardial ischemia is usually caused by coronary artery microvascular dysfunction, which can be treated with drugs such as nitroglycerin and nifedipine. Cardiac ultrasound is to observe the size, structure and function of the heart, whether the heart valves have closed insufficiency, etc., and cannot accurately describe the situation of blood vessel blood supply. Therefore, patients can follow the doctor’s advice to do 24h dynamic electrocardiogram, which can record all the abnormal waves, can detect all kinds of arrhythmia and determine whether there is myocardial ischemia. Myocardial ischemia can be treated by medication, patients should take calcium antagonists such as nifedipine and nitrates such as nitroglycerin and isosorbide mononitrate at regular intervals as prescribed by the doctor, and pay attention to whether there are any adverse effects brought by the medication. Maintain a low-salt and low-fat diet, avoid spicy and greasy food, and quit smoking and drinking. Patients should usually pay attention to observe whether there are symptoms of chest pain, chest tightness and dyspnea, and if the above symptoms occur, they should go to the hospital in time to avoid delaying the condition.