defibrillator

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Related to Implantable cardioverter-defibrillator: pacemaker

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 ?
Strategic programming of detection and therapy parameters in implantable cardioverter-defibrillators reduces shocks in primary prevention patients.
How the results of this study might impact a physician's decision to implant an implantable cardioverter-defibrillator
5% of patients who received an implantable cardioverter-defibrillator in the United States from January 2006 to June 2009 did not meet the guidelines set out by the American Heart Association, American College of Cardiology, European Society of Cardiology, and Heart Rhythm Society.
Food and Drug Administration approval of its CardioSight(TM) Service, an in-clinic data access tool now available to physicians treating heart failure patients who have one of several Medtronic cardiac resynchronization therapy defibrillators (CRT-Ds) or implantable cardioverter-defibrillators (ICDs).
Under the new ESC heart failure guidelines, implantable cardioverter-defibrillators (ICDs) and cardiac resynchronization therapy (CRT) have been designated Class I for indicated heart failure patients, which means they are recognized as standard-of-care treatments for many heart failure patients already on optimal medical therapy.
Contract notice: Implantable cardioverter-defibrillators with a set of electrodes and equipment and introducerEw type of peel-away to puncture the subclavian vein.
Delivery implants, vascular prostheses and other small medical equipment in the following groups Group 1 Implantable cardioverter-defibrillators VR Single chamber with electrodes and introducerami.
Group 1 Implantable cardioverter-defibrillators VR Single chamber with electrodes and introducerami.

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