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Defibrillators are medical devices, used when someone suffers a sudden cardiac arrest (SCA). These can happen to anyone, at any time and often without warning. A sudden cardiac arrest occurs when there is an electrical fault with the heart and is often confused with a heart attack. The two vary in that a heart attack is caused when blood flow to the heart is blocked. This results in the person feeling light headed or dizzy, pain spreading across the chest to arms and shortness of breath to …