This is called scanning the scene. You want to check for hazards.
Be sure the victim is unconscious before performing CPR.
Don't forget to call 911.
Do not perform CPR if you can detect someone's pulse.
Do not panic. Expose the victim's chest to begin CPR.
Elbows locked. Knees shoulder-width apart.
AEDs can be used on everyone, but there are a few considerations to make for small children and people with pacemakers.
Listen for and follow the AED's instructions about when to stop and resume chest compressions.
Be sure to not touch the victim while the AED is delivering a shock.