Defibrillation, also known as AED, is taught with most CPR courses. It is becoming more popular as a saving technique for casualties of heart attacks. When used quickly it dramatically increases the person's chance of survival. A defibrilator is a hand held unit, about the size of a shoe box, that can deliver an electric shock to an unconscious casualty in an attempt to restabilize an irregular beating heart.
As their popularity increases they are found in places such as ice rinks, recreation centres, office towers, airports, etc.