What Is It?
A pacemaker is an implanted device that regulates your heartbeat electronically. It monitors your heart's rhythm and, when necessary, it generates a painless electric impulse that triggers a heartbeat.
Your pacemaker is programmed to meet the needs of your heart. Early pacemakers were implanted to treat bradycardia, an abnormally slow heartbeat. Now pacemakers can be programmed to treat a variety of heart problems, including heart failure.