A pacemaker is a small, battery-operated electronic device which is inserted under the skin to help the heart beat regularly and at an appropriate rate. The pacemaker has leads that travel through a large vein to the heart, where the wires are anchored. The leads send the electrical impulses to the heart to tell it to beat.
Review Date 6/25/2020
Updated by: Micaela Iantorno, MD MSc FAHA RPVI, Interventional Cardiologist at Mary Washington Hospital Center, Fredericksburg, VA. Also reviewed by David Zieve, MD, MHA, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team.