What is the primary function of a pulse generator in a pacemaker?

The primary function of a pulse generator in a pacemaker is to generate an electrical current for pacing. This electrical current is crucial as it stimulates the heart to contract, thereby maintaining an adequate heart rate and rhythm in patients whose natural heartbeats are irregular or too slow. The pulse generator delivers electrical impulses through leads that are positioned in the heart, ensuring that the heart chambers contract in a synchronized manner.

While there are other important functions associated with a pacemaker, such as monitoring the heart rate and ensuring that inappropriate impulses are blocked, the fundamental role of the pulse generator is to provide the necessary electrical stimulus that replaces or supplements the heart's natural pacing function. This makes it vital for patients who rely on a pacemaker to maintain proper cardiac function.