What must you do next if you find an unconscious adult that does not respond to a gentle shake and shout?

Call or direct someone to call 911.

If you have not already, you must call or direct someone to call 911 right away. Unconscious unresponsive patient maybe in cardiac arrest and an AED is only first treatment that may start the heart again. Calling 911 ensures an AED and other advanced medical care is on the way.