This document provides guidelines for performing CPR and using an AED on an unconscious adult victim. The steps are: check the scene and put on gloves, check for consciousness by tapping and shouting, call 911 and request an AED, check for breathing and pulse for no more than 10 seconds, give ventilations if breathing is absent, continue for 2 minutes and recheck, begin CPR if no pulse, continue until signs of life, rescuer exhaustion or unsafe conditions. If breathing does not occur, reposition airway or begin CPR. Follow AED prompts to analyze, shock if advised or begin CPR if not advised.