Defibrillation is a highly specialized medical procedure designed to restore the heart's normal electrical rhythm and save a person's life. Although not fully understood, defibrillation depolarizes a large amount of the heart muscle, ending the arrhythmia. Subsequently, the body's natural pacemaker in the sinoatrial node of the heart can re-establish normal sinus rhythm. This is accomplished by delivering a carefully controlled and brief electrical current to the heart, which is very different from the uncontrolled and potentially lethal exposure to electrical current in electrocution. 
Also, it's important to mention that If you are not trained in defibrillators, you shouldn't try to use one yourself. And if you find yourself in a situation where someone needs emergency medical attention and a defibrillator is available, it is important to contact the ambulance service before using it without any guidance.
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