How to save life in CPR

Before you begin
Before starting CPR, check:

Is the environment safe for the person?
Is the person conscious or unconscious?
If the person appears unconscious, tap or shake his or her shoulder and ask loudly, "Are you OK?"
If the person doesn't respond and you're with another person who can help, have one person call 911 or the local emergency number and get the AED, if one is available. Have the other person begin CPR.
If you are alone and have immediate access to a telephone, call 911 or your local emergency number before beginning CPR. Get the AED if one is available.
As soon as an AED is available, deliver one shock if instructed by the device, then begin CPR.