Check responsiveness and call emergency services
Check breathing for no more than 10 seconds
If not breathing normally, start chest compressions
Place the heel of one hand on the center of the chest, place the other hand on top, interlock fingers, keep arms straight
Compress the chest hard and fast at a rate of about 100–120 compressions per minute
Depth: about 2 inches (5 cm) in adults
Allow full chest recoil between compressions
Perform cycles of 30 compressions and 2 breaths if trained and able
Open the airway using head tilt–chin lift
Pinch the nose closed, make a seal over the mouth, give 2 effective breaths (watch for chest rise)
If breaths are not possible, do compression-only CPR
Continue CPR until help arrives, an AED is ready, the person starts breathing normally, or you are too exhausted to continue
If an AED is available, turn it on, follow voice prompts, and apply pads to bare chest as directed
Stop CPR briefly to analyze rhythm, then resume CPR immediately when instructed