As an expert in emergency medical response, I would advise the following steps to take if you encounter someone who is unconscious and not breathing: 1. Call for help: Immediately call your local emergency number or ask someone nearby to do so. 2. Check responsiveness: Gently shake the person's shoulder and ask loudly, "Are you okay?" 3. Open the airway: Tilt the person's head back slightly and lift their chin to open the airway. 4. Check for breathing: Look, listen, and feel for signs of breathing for no more than 10 seconds. 5. Start CPR: If there's no breathing or only occasional gasps (agonal breathing), begin CPR by pushing hard and fast in the center of the chest at a rate of 100-120 compressions per minute. 6. Use an AED if available: If an automated external defibrillator (AED) is nearby, turn it on and follow the voice prompts. Remember, it's crucial to act quickly in such situations as the chances of survival decrease by 7-10% for every minute without intervention. read more >>

Call or tell someone to call 911. Check the person's airway, breathing, and pulse frequently. If necessary, begin CPR. If the person is breathing and lying on their back, and you do not think there is a spinal injury, carefully roll the person toward you onto their side.read more >>