Step One: Securing a Patent Airway
Make sure the victim's airway is open. The respiratory tract is the air passages from the mouth and nose to the lungs. Every person who can speak or scream is conscious and has an open airway.
When the victim is unconscious, you need to make sure that his airway is open. To do this, throw your head back and lift your chin. In this case, the tongue stops closing the back of the windpipe, allowing air into the lungs.
Determine for signs of life without moving the victim. Only turn the victim onto their back when they are not breathing or have a pulse. If you need to turn the victim onto his back, support his head so that the head and spine are, if possible, on the same axis.
If you suspect the victim has a neck injury, use another technique to open the airway called jaw thrust without head thrust.
When a foreign body enters the respiratory tract, you first need to remove it.