The normal human heartbeat should be around 60-100 beats per minute, mostly around 60-70 beats per minute at rest, but the number of heartbeats can increase to more than 100 beats per minute during activities, after meals or when excited. The faster the heartbeat, the more oxygen the body consumes, so the body needs more oxygen to supply its activities. Patients with coronary heart disease have narrowed or blocked blood vessels supplying the heart, thus affecting the blood and oxygen supply to the heart and causing these patients to suffer from myocardial ischemia in oxygen-consuming situations such as exercise. Therefore, in patients with coronary artery disease, doctors often prescribe a drug that slows down the number of heartbeats, called beta-blockers, such as betalactam, Conotoxin, etc. The purpose is to slow down the number of heartbeats of the patient, reduce the oxygen consumption of the heart muscle and relieve the lack of blood supply to the heart muscle. The main reason may be that the slow heartbeat reduces the total amount of blood supplied to the body by the heart. One of the most important observations doctors make when following up with patients with coronary heart disease is to count the number of heartbeats to see if they meet the above requirements. Doctors also ask patients to monitor their pulse rate at home. A heartbeat that is too fast may require an increase in the dose of heartbeat-reducing medication, and a heartbeat that is too slow may require a decrease in the dose of heartbeat-reducing medication. Patients should be seen at the hospital if their heart rate suddenly slows with or without chest tightness and other discomfort when the heart rate is stable and under control. This is because there is a type of myocardial infarction that can cause a sudden slowing of the heartbeat, especially if it is accompanied by chest tightness, dizziness, weakness, nausea, vomiting, or a feeling of bowel movement, and patients should be alerted to the possibility of an acute myocardial infarction and should seek immediate medical attention. Some patients may also experience transient black eye and fainting. The easiest way to count your heartbeat is to touch the pulse on your wrist, unless your doctor has diagnosed you with chronic atrial fibrillation, which is usually reflected by counting the number of pulses. You can count the number of pulses in 15 seconds and multiply it by four to get the number of pulses in one minute, the number of heartbeats. We generally count the number of pulses during quiet rest time during the day. The normal heart rate for people who do not use heart rate reducing drugs ranges from 60-100 beats per minute, and the normal heart rate for people who sleep at night can be around 40-50 beats per minute.