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CIRCULATION: Restore blood circulation
Check if the victim's heart is beating. In order to do that, find carotid artery. It is located in the depression between the windpipe and the neck muscles. Place two fingertips on it and apply slight pressure for several seconds. If no circulation is detected, begin chest compressions.
Compressions
After 30 compressions, tilt the head back and lift the chin up to open the airway. Prepare to give two rescue breaths. Pinch the nose shut and breathe into the mouth for one second. If the chest rises, give a second rescue breath. If the chest doesn’t rise, repeat the head tilt-chin lift and then give the second rescue breath. That's one cycle. If someone else is available, ask that person to give two breaths after you do 30 compressions.
Use your upper body weight (not just your arms) as you push with 2 hands straight down on the chest 2 inches deep. Push hard and push fast — give two compressions per second, or about 100 compressions per minute.