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 survival rate is less than 10% - something NEAS says is low compared to other countries in the world - as people are scared to attempt CPR and think that they cannot use a defibrillator.
"I visit a lot of schools to do author talks so I always ask them whether they have a defibrillator and explain how life saving they are.
Funding has been secured to train eight members of the community to use the defibrillators and this will be passed on to others within the village.
More than 1,200 people are now registered and proceeds will help fund more defibrillators and heart screening sessions throughout Wales.
The global defibrillators market report provides market size (Revenue USD Million 2013 to 2020), market share and forecasts growth trends (CAGR%, 2016 to 2020).
In addition, cardiac resynchronisation therapy defibrillator (CRT-D) is the fastest growing segment and is projected to register a CAGR 5.0% during the forecast period.
Automated external defibrillators, which are increasingly available in public places, are used to administer an electric shock in the event of a heart attack.
The idea is that, as well as the business helping save lives in their local community, they will get good PR because their name will be emblazoned above the donated defibrillator.
CHILDREN at 45 schools have been selected to receive lifesaving defibrillators as part of the 2013 World Police And Fire Games legacy.
"This study confirms the effectiveness of very early defibrillation as therapy for sudden cardiac arrest in high-risk patients when delivered by a wearable defibrillator," Mosesso said.
Food and Drug Administration (FDA) has recommended stricter safety measures for cardiovascular defibrillators after years of increasing problems with the emergency medical devices.