1 Check the scene and the person. Make sure the scene is safe, then tap the person on the shoulder and shout "Are you OK?" to ensure that the person needs help.
2 Call 911 for assistance. If it's evident that the person needs help, call (or ask a bystander to call) 911, then send someone to get an AED. (If an AED is unavailable, or a there is no bystander to access it, stay with the victim, call 911 and begin administering assistance.)
3 Open the airway. With the person lying on his or her back, tilt the head back slightly to lift the chin.
4 Check for breathing. Listen carefully, for no more than 10 seconds, for sounds of breathing. (Occasional gasping sounds do not equate to breathing.) If there is no breathing begin CPR.
Cardiopulmonary Resuscitation or CPR is a sequence of actions which are provided when a person suffers from a sudden cardiac arrest.
During SCA, the brain of the victim does not get any oxygen when the heart stops beating suddenly and the victim can die within a few minutes. So, CPR is provided in two steps mainly with:
1. Chest compression- by pressing down the chest about 2 inches with interlocked fingers over the chest and releasing the pressure again. repeat the compressions for about 100 times/min.
2. Giving rescue breaths- by putting the mouth over the patient's mouth and blowing the air until his chest rises.
