A defibrillator is a device developed to combat cardiac arrest or heart attack brought on by a fibrillation or irregular heart rhythm. This irregularity causes the heart to stop receiving enough blood and can result in sudden death if not treated properly. Automated External Defibrillators, also known as portable automated defibrillators, take much of the risk associated with their use by regular people. Most importantly, they come with the ability to assess whether or not the patient in question even needs an electric current, and if he or she does, it predetermines the wattage or power level.