If you have a slow and often irregular heartbeat, or if your heartbeat is sometimes normal and sometimes too fast or too slow, blood isn't pumped around your body well. In that case your doctor may recommend an artificial pacemaker. A pacemaker will make your heart beat more regularly. That will help ensure that enough oxygen and nourishment get to your body's cells.
An artificial pacemaker system has two parts: a generator and wires (leads). The pacemaker generator is a small battery-powered unit. It produces the electrical impulses that start your heartbeat. The generator is implanted under your skin through a small incision.
The generator is connected to your heart through tiny wires that are implanted at the same time. The impulses flow through these leads to your heart and are timed to flow at regular intervals just as impulses from your heart's natural pacemaker would.