pacemaker

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Related to internal pacemaker: Heart pacemaker

pacemaker

1. Anatomy a small area of specialized tissue within the wall of the right atrium of the heart whose spontaneous electrical activity initiates and controls the beat of the heart
2. Med an electronic device for use in certain cases of heart disease to assume the functions of the natural cardiac pacemaker

pacemaker

[′pās‚māk·ər]
(medicine)
A pulsed battery-operated oscillator implanted in the body to deliver electric impulses to the muscles of the lower heart, either at a fixed rate or in response to a sensor that detects when the patient's pulse rate slows or ceases. Also known as cardiac pacemaker; heart pacer.
References in periodicals archive ?
The first internal pacemaker was not fitted until 1958.
Over the years, researchers have proposed many variations on this model for firefly synchrony, but the basics always involve some kind of internal pacemaker in the insect's tiny brain.
Young of the Howard Hughes Medical Institute at Rockefeller University in New York City discovered recently that a second gene was also vital to this internal pacemaker.