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 ?
Based on previous findings in animal models, the researchers at the McEwen Centre tested and mapped out the specific developmental pathway of how human pluripotent stem cells become pacemaker cells.
As a result of the continuous development in economy and improvement in people's living standards, the aging trend has increased in China, leading to a dramatically increased number of patients relying on the treatment with pacemakers. So far, Qinming8631 DR implantable cardiac pacemaker is the first dual-chamber pacemaker developed in China with independent intellectual property, possessing efficacy and safety comparable to those of Talos DR pacemaker, is much cheaper than the imported pacemaker, and has huge potential for alleviating the financial burden of Chinese patients and providing more opportunities to those who are indicated for pacemaker implantation.
More than 4 million people worldwide have an implanted pacemaker or other cardiac rhythm management device, and an additional 700,000 patients receive the devices each year.
The Nanostim leadless pacemaker is not approved in the United States and is limited by federal law to investigational use.
They added: "Over half of all patients with pacemakers require a replacement procedure because the batteries have reached their expected life.
To create biological pacemakers, one approach is to coax stem cells to become specialized cardiac pacemaker cells that are normally found within the sinoatrial node of the heart.
"As a result, we are now able to fit a pacemaker within an hour of a patient coming in to A&E.
"Snooks got a pacemaker and I was treated with drugs at Crosshouse hospital in Kilmarnock.
Cardiologist Dr Archie Rao, who treated Mr Nesbitt, said: "This is a real advance in pacemaker technology, because the absence of leads should hopefully limit the associated complications that sometimes arise during implantation and thereafter."
As the number of pacemakers implanted into patients each year reaches into the millions, improving the lifespan of the batteries that power them has remained a great concern for developers and manufacturers.
Professor Morgan said: "While pacemakers have saved countless lives over the past seven decades since the first devices were implanted, one of the drawbacks has been complications with the pacing lead that is put in to deliver electrical impulses to the heart.