The life expectancy of bradycardia 45 beats/minute needs to be clarified, if it is physiological, it will not affect the life expectancy, if it is pathological, it needs to be analyzed specifically. Normal heart rate range between 60-100 beats / min, heartbeat less than 45 beats / min belongs to bradycardia, the cause of bradycardia is divided into physiological and pathological arrhythmia. Physiological factors are mainly seen in the sleep or the elderly in a long-term resting state, etc., and the heart rate of athletes who exercise a lot for a long period of time will be slower when they are calm, these are physiological bradycardia, which will not affect the life expectancy significantly. Pathologic factors that cause bradycardia are sinus bradycardia, atrioventricular block and other arrhythmias, hypothyroidism and other diseases. Active treatment of the primary disease or installation of a pacemaker is required. If the treatment is timely, the impact on life expectancy is small, but if the treatment of the primary disease is not actively pursued and the disease continues to progress, life expectancy will be shortened. Bradycardia 45 beats/minute also requires immediate medical attention to clarify the cause of the disease and active treatment.