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 ?
c) When an employee uses or attempts to use, an automatic external defibrillator consistent with the requirements of this section to render emergency care or treatment, the members of the board of directors of the facility shall not be liable for civil damages resulting from any act or omission in rendering the emergency care or treatment, including the use or attempted use of an automatic external defibrillator.
Keywords: Europe, European external cardiovascular defibrillators, western Europe, eastern Europe, automatic external defibrillators, AED, non AED, sudden cardiac arrest, SCA, coronary heart disease, public access market, biphasic technology, defibrillation
However, the good intentions of this bill go awry in an unnecessarily broad section entitled, "Immunity from civil liabilities for emergency use of automatic external defibrillators.
In principle, automatic external defibrillators on every corner may well be a good idea and save some lives.
AUTOMATIC external defibrillators (AED) are a simpler, more compact version of the 12-lead electrocardiograph (ECG) defibrilators used by paramedics.
The employees, clients and visitors of the tenants in Ashforth managed buildings will have a better chance of surviving a cardiac arrest in the workplace because of the newly installed Automatic External Defibrillators (AEDs).
Northwest Airlines has completed the equipping of its fleet with LIFEPAK 500 automatic external defibrillators and Biolog 3000 electrocardiograph monitors from Medtronic Physio-Control.
VIENNA -- Juicing up automatic external defibrillators by using biphasic instead of traditional monophasic waveforms boosts the success rate, Dr.
Continental Airlines has also announced that it will be installing automatic external defibrillators in all 361 of its jet aircraft commencing 2Q'2000.
Fitness facilities should obtain automatic external defibrillators and ensure that trained staff are available to use them during all hours of operation, according to the American Heart Association and the American College of Sports Medicine.
It pioneered the first modern intensive care unit in the late 1950's, contributed most significantly to the design and development of automatic external defibrillators, and more recently, as the Guidelines are being redirected, has developed portable automatic mini-chest compressors.
Tenders are invited for EMS Cardiac Monitor/Defibrillators and Automatic External Defibrillators.

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