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If there is no other chest or abdominal injury, and the patient is awake and conscious there is no need to worry about the airway
Avoid moving the head. The head should be kept as you found it if there is a suspected neck injury.
Suction is used for airway management when the patient can't manage his or her own secretions.
Because even though it is recommended for an unconscious patient, if the patient has sustained to severe of a trauma the nasal airway could damage the patient more than help them.
For suspected neck or back injury use the jaw thrust method to open the airway; you are correct.
rest your elbows on the same surface on which the patient is lying
TONGUe
The patient can breath better when it is open
tongue
Place the oropharyngeal airway (Guedel) on patient's face to check for correct size - tubing should extend from the corner of the mouth to the tip of the earlobe.
If the patient is choking, the first priority is to clear the airway, not check the pulse. The airway should be cleared first, and then once the rescue breaths go in, check for a pulse.
The most common cause of airway obstruction in any patient - supine or not - is the tongue. This is why the first maneuver that should be performed on a patient not breathing is the head-tilt/chin-lift or the jaw thrust. This is to help clear the tongue from the airway and may allow the person to breathe again.