What is an AED device? AED stands for Automatic External Defibrillator, a device that can help save a life of a heart attack victim. When you are curious about using a portable AED in your home, or your place of business, and you are asking "How To Use An AED", it is important to note as a disclaimer here that you need to seek professional help first - take the automatic defibrillator training, or talk to a medical doctor first about your specific home AED defibrillator installation. In this quick article, we will go over the basic "chain of survival" sequence that will help you use an AED in an emergency, for example when you see someone who requires help. We will go over four links in the chain: Quickly diagnose a heart condition emergency and notify EMS, the emergency medical service, CPR, AED shock, Advanced life support.