Continue CPR without stopping until one of the following happens:
A defibrillator (AED) arrives and is ready to use \u2014 follow the AED’s instructions, which will tell you when to stop compressions for a shock and when to resume.
The ambulance crew arrives and takes over \u2014 tell them how long you have been doing CPR and whether the AED has been used.
The person starts showing clear signs of life \u2014 normal breathing, coughing, or purposeful movement. If this happens, stop CPR, place them in the recovery position if they are breathing, and stay with them until the ambulance arrives.
You are physically unable to continue \u2014 if there is anyone else present, ask them to take over. Even brief pauses in compressions reduce the chance of survival, so try to swap with as little interruption as possible.
Do not give up before the ambulance arrives unless you are physically unable to continue. People have survived after prolonged CPR. The 999 dispatcher will stay on the line with you and can advise.