pacemaker

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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
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

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.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
FRENKEL-TOLEDO S., GILADI N, PERETZ C., HERMAN T., GRUEDLINGER I, HAUSDORFF JM., 2005, Treadmill walking as an external pacemaker to improve gait rhythm and stability in Parkinson's disease.
He developed a potentially fatal erratic heartbeat and was placed on an external pacemaker, which doctors worried could be disrupted by any form of movement.
However, as doctors began to turn off an external pacemaker stimulating her heart following the operation her heart beat dropped from 120 beats a minute to just 35.
Finley was just ten weeks old when he had to be fitted with an external pacemaker, after he developed a potentially fatal erratic heartbeat following surgery.
In 1932 we had the first external pacemaker, but as it depended on a needle going through your chest into your heart it wasn't practical long term.
But as doctors began to turn off an external pacemaker stimulating her heart following the operation, her heart beat dropped from the normal 120 beats a minute to just 35.
After the operation the youngster developed a potentially fatal erratic heartbeat and was fitted on an external pacemaker, which medics worried could be disrupted by any form of movement.