The installation of a pacemaker is not a major surgery, but a minor one. It usually takes a puncture of the left subclavian vein or the right subclavian vein, and an electrode lead is passed through the subclavian vein into the right atrium and right ventricle, and the electrode is pressed on the ventricle or atrium to make the heart beat under the action of the pacemaker. In addition, the head end of the pacemaker, where the electrode contacts, is in contact with the ventricle or atrium, and the end one is attached to a pacemaker, a very small one. The pacemaker is usually buried in the chest wall, that is, we make a skin pocket under the chest, put the pacemaker in it and sew it on. So the patient is only under local anesthesia during the whole procedure, not the whole procedure, and the patient is conscious, so it is a minor surgery and the risk is relatively small.