Decreased cardiac output may lead to angina, a common cause of coronary atherosclerosis. Reduced cardiac output affects cardiac function, and a severe decrease in cardiac function can affect blood supply to the whole body, including the brain. Specific phenomena include decreased physical strength, decreased immunity, and low blood supply to the brain, which can cause dizziness and confusion (if the standing position is easy to fall and get injured). So what are the effective preventive measures? If a person has a sudden shortage of blood supply, press the Jiuquan point immediately and the blood will be supplied to the heart at a very fast rate. The technique involves pressing and rubbing the left axillary point with the index finger of the right hand, and vice versa with the index finger of the left hand, 50 times each. Patients with reduced cardiac blood flow will have symptoms of insomnia and can choose to take some tranquilizing drugs, depending on the doctor’s opinion, which can also be reduced or stopped in moderation after the situation improves.