Mayo Clinic advises that a first aider should position an unconscious person on his/her back and raise his/her legs by 30 centimeters (12 inches). Raising the patient’s legs above heart level will restore blood flow to the brain. The next step is to loosen the patient’s collar, belt or any other constrictive clothing. In case the person does not regain consciousness, you should call 911 or your local emergency number. Next, check the patient’s airway to ensure it is clear. Finally, the first aid provider should check for signs of life including breathing, coughing or any movement. If those are absent, begin CPR.