In a witnessed cardiac arrest event, the greatest chance of survival for the victim is within the first four minutes after collapse. During this period, if an AED is used to deliver a shock
to the victim, the chances of the heart re-starting is around 75 to 80 percent. AEDs are designed so that anyone, regardless of training, can use them to save a life. Because seconds
matter, time is of the essence so it is important to understand the basic steps to use an AED.