š«What Are Defibrillators? Defibrillators are devices that apply an electric charge or current to the heart to restore a normal heartbeat. If the heart rhythm stops due to cardiac arrest, also known as sudden cardiac arrest (SCA), a defibrillator may help it start beating again. A sudden cardiac arrest is fatal unless treated right away with CPR (cardiopulmonary resuscitation) and a defibrillator.
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