Pacemakers are generally of three types. namely-
1. Single chamber pacemaker: It paces any one chamber of the heart.
2. Two chamber pacemaker: It paces the two chambers of the heart. atrium and ventricle.
3. A three-chamber or rate-responsive pacemaker responds to the patient’s physical activity and automatically adjusts the heart rate. These three wires carry electrical impulses to the right atrium, right ventricle, and left ventricle.