Is the Victim Breathing?
B is for Breathing. If your victim is not breathing, start CPR. Remember to tell someone to call 911 if you haven't already.
Start CPR by pushing on the middle of his chest, right between the nipples. Push hard and fast, at least 2 inches deep and at least 100 times per minute (sing Stayin' Alive or Another One Bites the Dust in your head and push with the beat).
If you've never taken a CPR class -- or you don't remember all the steps that well -- then just keep pushing fast and hard until somebody shows up to help (Hands Only CPR).
If you feel comfortable with CPR, then follow the steps: 30 chest compressions, followed by two rescue breaths, and repeat. Here are the steps to help you remember:
But the Victim Is Breathing!
Think your victim is breathing? Take another look. Is he gasping for air kind of slowly, like a fish out of water? If so, start CPR just like if he wasn't breathing (how to do CPR on gasping victims).
So you've decided that your victim is breathing fairly normally. Someone called 911 when you realized your victim wasn't waking up (nobody's calling 911? Call now).
Take a breath (your victim is, so you can) and move on to C: Continue Care.