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They are prescribed for patients who have survived sudden cardiac arrest, a rapid or chaotic heart rhythm that is generally fatal within minutes.
Other analysts have speculated that doctors have been more selective in deciding which patients should receive defibrillators, devices that restore a chaotic heart rhythm.
The device, which is about the size of a pager, sends out an electrical charge when it senses a chaotic heart rhythm known as a ventricular fibrillation.
His death, from a fatal cardiac disturbance called commotio cordis, was the second in four years for a Cornell athlete that resulted from a chaotic heart rhythm.
The most serious of these arrhythmias is ventricular fibrillation (V-Fib/VF), an extremely fast and chaotic heart rhythm that is the leading cause of sudden cardiac death.
But many health policy experts involved in the issue said the size and expense of last year's recalls of defibrillators, devices intended to interrupt a chaotic heart rhythm, have set off a new round of debate.
No one disputes that many heart patients need a defibrillator, a device that sends out an electrical jolt to interrupt a chaotic heart rhythm that can cause sudden cardiac arrest, which is often fatal.
Medizinwörterbuch für Ạ̈rzte und Krankenschwestern