Who should use pacemakers?

HeartRhythm or block. Pacemakers are most commonly necessary for patients with bradycardia- slow heart rate, tachycardia - fast heart rate, and heart block - when the heart stops beating for several seconds.
Several indications. There are specific consensus guidelines for pacemaker implantation. In general they are used for patients with abnormally low heart rates, particularly if there are associated symptoms. They are also used when there is a problem with the normal eclectrical system of the heart where the electrical impulse does not conduct from the upper to the lower chamber of the heart, also known as heart block.