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 ?
Hematoma was noted in 23 patients, (1.9%) lead dislocation in 25 patients (2.1%) lead disconnection in 2 patients 15 (0.2%) and insulation break in 2 patients (0.2%) while pocket hematoma was seen in our study in 1 patient (0.7%).The reported incidence of pacemaker syndrome varies from 1.7% to 83% as reported in PASE trial (Pacemaker Selection in Elderly).
The overall incidence of pacemaker syndrome, as prospectively defined in the Mode Selection Trial (MOST) was 18%.17
The major disadvantage of single-chamber rate-responsive systems in patients with advanced atrioventricular block is clearly loss of atrioventricular synchrony with the attendant risk of pacemaker syndrome. However, those at risk with intact ventriculoatrial conduction may be identified during pacemaker implantation and offered a conventional dual-chamber system.