defibrillator

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defibrillator,

device that delivers an electrical shock to the heart in order to stop certain forms of rapid heart rhythm disturbances (arrhythmiasarrhythmia
, disturbance in the rate or rhythm of the heartbeat. Various arrhythmias can be symptoms of serious heart disorders; however, they are usually of no medical significance except in the presence of additional symptoms.
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). The shock changes a fibrillation to an organized rhythm or changes a very rapid and ineffective cardiac rhythm to a slower, more effective one. In a typical hospital defibrillator, voltage stored by the defibrillator pushes electrical current through the chest to deliver a muscle-contracting jolt to the heart; the current is transmitted by means of electrodes or paddles placed on the chest. Automated external defibrillators are now available for use by persons with minimal medical training in emergencies when medical professionals are unavailable, and miniaturization has led to the development of the implanted internal defibrillator (also called an internal cardioverter). In the latter a microcomputer uses an electrode to monitor the heartbeat. Upon detecting a minor arrhythmia, it activates a built-in conventional pacemakerpacemaker, artificial,
device used to stimulate a rhythmic heartbeat by means of electrical impulses. Implanted in the body when the heart's own electrical conduction system (natural pacemaker) does not function normally, the battery-powered device emits impulses that trigger
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 to restabilize the heart's rhythm. If that fails, it delivers a small defibrillating electrical shock to the heart. In an extreme case, it resorts to a far stronger shock to reset the heart rate.

Defibrillator

 

an apparatus designed to eliminate the major impairment of cardiac activity manifested in separate contractions at different times of individual muscle fibers of the cardiac muscle (fibrillation).

In this condition the heart cannot work efficiently. Cardiac activity is not restored spontaneously during fibrillation. The most effective means to stop fibrillation is to feed a single shortterm (0.01 second) electrical impulse created by discharge of the condenser in the defibrillator to the heart muscle (open or through the thorax). Various models of defibrillators (the ID-VEI-1 and ID-66T) have been built in the USSR. The impulses generated by these defibrillators have a less damaging effect on the heart than the apparatus of other systems. A voltage of 1.5-2.5 kilowatts is used for defibrillation on an open heart (during operations), and a voltage of 4-7 kilowatts is used with an unopened thorax.

L. E. MANEVICH

defibrillator

[dē′fib·rə‚lād·ər]
(medicine)
An electronic instrument used for stopping fibrillation during a heart attack by applying controlled electric pulses to the heart muscles.
References in periodicals archive ?
The global defibrillators market growth is driven by the development of technologically advanced defibrillators, rapid growth in aging population with high risk of target diseases, rising incidences of cardiovascular disease, growing focus of public and private organizations and key market players toward public access defibrillators, and increasing number of training and awareness programs across the globe.
T-wave testing combined with other tests could reduce unnecessary use of defibrillators by as much as 40 percent, Rosenbaum says.
Pakizer, who is trained in using the devices, approached supervising Judge Thomas White about getting the defibrillators, and White said it was a good idea.
Although some businesses may fear that implementing an automated external defibrillator program could increase their liability exposure, it actually can control risks, according to a loss-control expert with Hartford Financial Services Group.
This sequence of events associated with cardiac arrest may be reversed if the victim receives immediate cardio pulmonary resuscitation along with an electrical shock from a defibrillator.
Factors such as development of technologically advanced defibrillator, rapid growth in aging population with high risk of target diseases, rising incidences of cardiovascular disease, growing focus of public and private organizations and key market players toward public access defibrillator, and increasing number of training and awareness programs across the globe are propelling the growth of the market.
Doctors would like to improve their ability to distinguish people who truly need defibrillators from those who don't.
The Valencia Town Center also has installed defibrillators.
Some airlines and gambling/entertainment clubs and casinos, as well as some upscale health and fitness facilities and governmental agencies, are buying defibrillators and are training staff to use them.
1: Market Size and Forecast for Global Defibrillators Market 2008-2012 (in $ billion)
The global defibrillators market growth is driven by the development of technologically advanced defibrillators, rapid growth in the aging population with high risk of target diseases, rising incidences of cardiovascular disease, the growing focus of public and private organizations and key market players toward public access defibrillators, and increasing number of training and awareness programs across the globe.
Having mobile defibrillators on those courses and other county facilities would save lives, he said.