What do you do when someone stops breathing?

If someone stops breathing, immediately call for emergency medical help. Begin CPR by performing chest compressions at a rate of 100 to 120 compressions per minute, and if trained, provide rescue breaths after every 30 compressions. Continue CPR until emergency personnel arrive or the person starts breathing again. If an Automated External Defibrillator (AED) is available, use it as soon as possible.