Complications can occur after the pacemaker is installed, as follows: 1. Pouch infection: The pacemaker is usually placed on the pectoralis major fascia of the right upper limb, so some patients are not careful about compression or displacement, and even redness, swelling and flowing water can occur, causing infection, which is one of the common complications of pacemakers; 2. Lead dislocation or displacement: Patients with pacemakers are reminded to avoid raising the affected side or doing strenuous back and forth, up and down, and left and right movements to avoid lead displacement; 3. The main functions of the pacemaker are pacing and perception, and the main way to understand the poor pacing function or bad perception is to do electrocardiogram, which requires adjustment of the pacemaker parameters.