A Pacemaker is a small device that helps control abnormal heart rhythms. The doctor places the Pacemaker just under the skin under the collar bone, and connects the device to the heart with electrical leads. The heart of an adult at rest normally beats 60 to 100 times per minute. If the heart starts to beat too slowly (bradycardia), this device produces electrical pulses to restore a normal heart rate. There can be several reasons for the need of a pacemaker but most commonly they are placed to help correct electrical problems that can occur due to age or various other physiological factors.