What Is a Pacemaker?

Bradycardia (Slow Heart Rate)

When people refer to a pacemaker, they are actually discussing a pacing system: a pacemaker, a pacing lead or leads, and a programmer.

Two parts are placed inside the body: the pacemaker and pacing lead.

The pacemaker is a small metal case that contains electronic circuitry and a battery. The pacemaker continually monitors the heart and sends an electrical impulse to pace the heart when the heart’s own rhythm is interrupted, irregular, or too slow.
The pacing lead is an insulated wire that carries the tiny electrical impulse from the pacemaker to the heart to regulate the heart rate.
The third part, the programmer, is kept in a hospital or clinic. A nurse or doctor uses the specialized computer to see how the pacemaker is working and if necessary, to adjust the settings of a pacemaker.

The three parts of a pacing system work together to treat bradycardia (a heart rate that is too slow).

A pacing system increases the heart rate to meet the oxygen needs of the body.

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