Check for scene safety
Tap the person and shout to see if they respond
Call emergency services or direct someone else to call
Send someone to get an AED
Check breathing for no more than 10 seconds
If not breathing normally, begin CPR
Place the person flat on their back on a firm surface
Kneel beside the chest
Place the heel of one hand on the center of the chest
Place the other hand on top and interlock fingers
Keep arms straight and shoulders over hands
Push hard and fast at a rate of 100 to 120 compressions per minute
Compress the chest at least 2 inches deep
Allow full chest recoil after each compression
Give 30 chest compressions
Open the airway by tilting the head back and lifting the chin
Pinch the nose shut
Give 2 rescue breaths if trained and willing
Make each breath last about 1 second
Watch for the chest to rise
Continue cycles of 30 compressions and 2 breaths
Use the AED as soon as it arrives
Follow the AED prompts
Resume CPR immediately after any shock or if no shock is advised
Continue until the person shows signs of life, help takes over, or you are too exhausted to continue