pacemaker

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Related to pacemaking: fixed rate pacemaker, demand 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
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 ?
Application of Ach slowed down pacemaking rates in both central and peripheral SAN cells, with larger effect on the central cells [32].
Knowing that traffic problems can upset all plans in a 1,200-metre sprint, Bouresly said jockey Mick Kinane could be forced to resort to pacemaking tactics to ensure his horse had the best chance.
Fellow Briton Emma Pooley, who played a crucial pacemaking role in helping Cooke achieve her golden glory, finished back in 23rd place, 30 seconds behind Cooke.
"The pacemaking was a bit off over the middle section as well, so I could probably have gone faster, but I'm not complaining."
A gamble on Albert Hall in the opening Tinnakill House European Breeders Fund Maiden Stakes went astray when O'Brien's 1-2 favourite (from 5-4) got going a little too late and failed by half a length to catch the pacemaking Night Prayers (25-1), who scored for local trainer John Hayden.
"Vespone would probably be an unlikely runner, as Millstreet would be more likely to take the pacemaking duties."
In the 1950s, when television was only in black and white, so were the rules: there must be no outside assistance, whether coaching advice from the sidelines, or - heaven forbid - pacemaking.
Relegated to pacemaking does not bother Mayock, who is employed by the Sports Council for Wales as national development officer.
Now they are finding life rather more difficult in Division One but the boys from the boonies can stay in the pacemaking pack, creating problems for the likes of leaders Harborne and Leamington.
In the finale Lughill Arthur is another scratch dog who hasn't been badly treated and could concede the start at the expense of pacemaking Star Tiger who runs on gamely.
The winning distance was seven lengths over the pacemaking Twentytwoandchange, with Rahn a half length away in third.
Unusually, there is a distinct lack of early pace in tonight's final and pacemaking duties may be set by Stainless Steel, who posted an identical time to Farloe Tango when he scorched home by almost five lengths from Sinbad in the opening round.