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 ?
2) Every health studio, as defined in subdivision (h), shall maintain, and train personnel in the use of an automated external defibrillator acquired pursuant to this section, and shall not be liable for civil damages resulting from the use or attempted use of an automatic external defibrillator as provided in this section.
Ornato presented the principal outcomes of the Public Access Defibrillation (PAD) trial, a massive prospective study which randomized roughly 20,000 lay volunteer rescuers to training in CPR or to CPR plus the use of an automatic external defibrillator (AED) in individuals experiencing sudden cardiac arrest in public sites.
Tenders are invited for supply /installation of Automatic external Defibrillator (FDA) in the state UP.
Rancho Murieta Country Club has become one of the first private country clubs in California to implement a fully equipped Automatic External Defibrillator (AED) Program.
Shyama Prasad Mukherjee Hospital Lucknow ALS Ambulance (for NHM Budget)- Automatic external Defibrillator (FDA).
These motorcycle ambulances will be equipped with fold able stretcher, trauma kits, burn kits, automatic external defibrillators, portable oxygen, pulse odometer and glucose meter.
Full training in emergency skills is provided as well as the use of automatic external defibrillators and oxygen therapy.
District Judge has ordered Philips North America, as well as two Philips officers, to cease manufacturing and distribution of automatic external defibrillators (AEDs) until they can comply with federal regulations in a consent decree, according to a statement from the Food and Drug Administration.
HEARTSINE is celebrating an increase in sales of its innovative Automatic External Defibrillators by more than 60% in the Middle East.
Leading health campaigners, including the Royal College of Paediatrics and Child Health and the British Medical Association, joined by the likes of Gerrard, boxer Amir Khan and Tottenham player Gareth Bale, have signed a letter urging David Cameron to support legislation which will ensure the provision of Automatic External Defibrillators (AEDs) in the community.
The Reds and England midfielder signed up to a letter to Prime Minister David Cameron saying that "we are not asking the government to pay for these devices but for legislation that ensures automatic external defibrillators (AEDs) are available in all public buildings, in a manner similar to the current provision of fire extinguishers.
Dr Ray has been called to assist in 10 emergencies and says most of the major airlines, particularly on long haul flights, have ample emergency equipment, training and protocols to deal with medical situations, including access to automatic external defibrillators and contact with ground-based emergency physicians for advice and instruction.

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