What is a pacemaker?
How does a pacemaker function?
There are two essential functions of a pacemaker: pacing and sensing.
Pacing is when a pacemaker sends electrical impulses to your heart to start a heartbeat. The pacemaker paces the heart when the heart's own rhythm is interrupted, irregular, or too slow.
A pacemaker also has the ability to sense. If a pacemaker senses a natural heartbeat, it will not pace the heart.