what is a pacemaker for
What is a pacemaker? A pacemaker is an electrical device. It is implanted under your skin to help manage irregular heartbeats called arrhythmias. Modern pacemakers consist of two parts. One part contains the battery and the electronics that controls your heartbeat. The other part is one or more leads, which send signals to your heart. - Leads are small wires that run from the pulse generator to your heart muscle. Pacemakers are generally used to treat two types of arrhythmias.: 1  tachycardia-a heartbeat that is too fast. 2  bradycardia-a heartbeat that is too slow.