See a heart rhythm specialist . It's used when someone stops breathing or his or her heart stops. Anyone can learn to perform this simple procedure. CPR can increase a sudden cardiac arrest victim's chance of survival, if it's begun before defibrillation. It has a built-in computer that analyzes the victim's heart rhythm and determines if it requires a shock.
Most people can learn to operate an AED with a few hours of training.
The AED leads the operator through the rescue process step by step. The operator attaches the adhesive electrodes to the victim's chest. The machine assesses the victim's heart rhythm. The operator follows the machine's voice prompts and screen instructions. The AED will not allow a shock to be given unless needed.