2. If the airway seems to be open and the victim is still not inhaling and exhaling, begin rescue breathing:

a. Place a mouth-harrier device over the victim's mouth. That will protect both of you from orally transmitted diseases.

b. While maintaining the head-tilt or jaw-thrust position, pinch . the nostrils, seal your mouth over the victim's mouth, and blow into it to fill his lungs. (For a child, seal your mouth over both the mouth and nose, then breathe gently.) Watch to see if the chest rises.

c. Remove your mouth and take another breath. Look for the victim's chest to fall as he exhales.

d. Repeat every 5 seconts for anyone over 9 years of age, every 3 seconds for anyone 9 or under.

If the victim's chest does not rise and fall, no air is reaching the lungs. Follow these steps:

e. Reposition his head and jaw so that the tongue does not block the airway.

f. Check again for obstructions in his mouth.

g. Perform the Heimlich maneuver to remove anything lodged in the throat.

Resume rescue breathing. Continue until a medic tells you to stop or it becomes physically impossible for you to keep going.