A pacemaker is considered when the heart rate is less than 40 beats per minute and there is bradycardia causing the corresponding clinical symptoms. A pacemaker is an electronic device for the treatment of cardiac dysfunction due to arrhythmia. When the heart rate is lower than 40 beats/minute in the awake state and there are corresponding clinical symptoms, such as the patient has heart failure, blackout, fainting, angina pectoris, ventricular arrest and other clinical symptoms, the installation of a cardiac pacemaker should be considered. However, the specific treatment plan should also be decided by professional cardiologists according to the patient’s condition. Regardless of the clinical symptoms, patients with arrhythmia should consult the cardiology department of regular hospitals at an early stage and on a regular basis to improve the relevant auxiliary examinations to clarify the condition and to be guided by a professional physician for further treatment in order to avoid delaying the condition.