A Pacemaker is a battery-powered device that sends electrical signals to your heart to help it beat at a proper rate or “pace”. The pacemaker goes under your skin, beneath your collarbone and is connected to your heart by one or more wires (leads). It is used to treat bradycardia and atrial fibrillation associated with bradycardia. Bradycardia is an arrhythmia that is caused when electrical signals are not produced at a fast enough pace by the SA node (the heart’s natural pacemaker) or these signals do not reach the ventricle. It causes an abnormally slow heartbeat. The pacemaker delivers regulated electric signals to the heart muscle to restore a normal heartbeat rate.