Adult CPR
After making sure you are in a safe environment...
If there is someone nearby, tell them to dial 911 and commence with 30 chest compressions. These should be hard, fast, and in the middle of the chest at least 2 inches deep. The rate at which you press should be at least 100 compressions per minute.
Make sure this person is lying on their back, on a flat surface if possible
Give two rescue breaths
First, tilt the head back and lift the chin up. Then pinch the nose shut and make a complete seal over the person’s mouth. Blow in for about 1 second to make the chest clearly rise. Make sure to give rescue breaths, one after the other.
If chest does not rise with rescue breaths, retilt the head and give another rescue breath.
Don't Stop
Continue cycles of CPR. Do not stop CPR except in one of these situations: you find an obvious sign of life, such as breathing, an AED is ready to use, another trained responder or EMS personnel takes over, you are too exhausted to continue, the scene becomes unsafe.