Cardiac pacemaker, a group of cells within the heart that together initiate contractions and set the pace of beating
Artificial pacemaker, a device implanted to provide proper heart rhythm when the body's natural pacemaker does not function properly
Biological pacemaker, use of transplanted cells or genes which act as cardiac pacemaker or transform existing cells into pacemaker cells
Brain pacemaker, a device which sends electrical impulses to the brain in order to relieve depression, epilepsy and other conditions
Diaphragmatic pacemaker, a device used to help patients breathe through pacing of the diaphragm
In other uses:
National Pacemaker Awards, America's highest honors in the world of high school and collegiate journalism, awarded to publications and broadcast media by the National Scholastic Press Association and the Associated Collegiate Press, respectively
Pacemaker (track) or pacer, a competitor who enters a race with little or no intention of winning, but purely to set a fast pace for other competitors to follow