Under normal circumstances the pulse and heart rate are the same, the pulse in normal circumstances is generally between 60-100 times / min, reaching about 40 times / min is not normal, belong to bradycardia, for such patients need to be examined to clarify the cause of bradycardia. However, athletes, people with long-term physical work, and people who are sleeping may have a slow heart rate, which is normal. However, if the heart rate is below 40 beats per minute, the presence of organic heart disease may be highly suspected, and an electrocardiogram or even an ultrasound may be required to determine whether the bradycardia is caused by myocardial ischemia, pre-excitation syndrome, conduction block or other diseases. After heart disease is ruled out, it is also necessary to rule out other diseases that cause bradycardia, including hypothyroidism, poisoning and other conditions that cause bradycardia, and then the patient needs to be treated for the original disease.