pacemaker

noun3

1. •
   Specialized cells which stimulate the heart to beat.
2. •
   A medical implement that is used to stimulate a heart to beat by simulating the action of the natural pacemaker.

   • High intensity EMF can have adverse impacts on the operation of implantable medical devices (IMDs) such as pacemakers and defibrillators. — 2024
3. •
   One who sets the pace in a race, to guide the others.