The need for a pacemaker for a heartbeat of 30~40 beats/min cannot be generalized. If a heartbeat of 30~40 beats/min occurs during sleep at night, with no obvious discomfort after waking up, and no dizziness or black haze during daytime activities, a pacemaker is generally not needed; on the contrary, a pacemaker may be needed. 1. No need: some patients may have a heartbeat of 30~40 beats/min during night sleep, which is due to the higher tension of the vagus nerve at night, causing a slower heart rate. If there is no obvious discomfort after waking up in the morning and no obvious symptoms of insufficient cerebral blood supply such as dizziness and black haze during the daytime activity time, there is generally no need to install a pacemaker. 2. Need: Some patients may have a heart rate of 30~40 beats/min during the daytime, in this case, the heart rate is seriously low, which cannot meet the needs of daily activities, and there is a risk of myocardial ischemia, cerebral ischemia, sudden death, malignant arrhythmia, etc., and pacemakers need to be installed to prevent the risk. It is recommended to go to the hospital in time when this kind of situation occurs, after the doctor’s comprehensive analysis of the condition, and to carry out targeted treatment.