Pacemaker implantation - A pacemaker is a small, battery-powered device that's surgically implanted in the chest or abdomen to regulate a slow or irregular heartbeat. It's used to treat conditions like bradycardia, sick sinus syndrome, and heart block. How it works A pacemaker sends electrical impulses to the heart through wires called pacing leads. The rate at which the impulses are sent is called the pacing rate. Most pacemakers can adjust the pacing rate based on your body's needs. For example, they can speed up when you're active. Pacemakers can also help the chambers of your heart beat stronger and at the same time. (Note: This procedure can be done in hospital setting only)