If one sees an individual with cardiac arrest, they are to check their surroundings and then they would exam the individual and determine if the victim is responsive; afterwards, the individual must alert their local emergency department. If the victim shows no sign of a pulse or is unable to breathe then they should begin with the AED rescue.
After the first AED shock has been delivered to the victim the individual performing the AED would begin CPR for two minutes. The AED would then analyze the patient again, since the AED provides very clear instructions the individual is to follow them until the paramedics arrive on the scene.