Pacemakers are used to treat problems with the rate or rhythm of the heartbeat also known as arrhythmias. This is a small device uses electrical pulses to prompt the heart to beat at the normal rate. It is placed in the abdomen or chest to help control abnormal heart rhythms. Having a peace maker have the variety of reason but mostly it due to a group of conditions called arrhythmias, where the heart rhythm is abnormal. Also sometimes it is cause by a genetic condition making it beat so slowly.