Nasopharyngeal airway sizes for adults

An oropharyngeal airway OPA is also known as an oral airway or Guedel pattern airway named after the original designer Arthur Guedel. Either device can be used depending on the indications for use and patient circumstances. The oropharynx is the primary site of upper airway obstruction in unconscious or anesthetized patients. This is because the tongue and muscles of the jaw causing posterior movement of the tongue and epiglottis, which may obstruct the airway. As described, the main indication for use of an OPA is if a patient is at risk of airway obstruction due to relaxed upper airway muscles or blockage of the airway by the tongue. For example, if you perform a head tilt-chin lift maneuver or jaw thrust on a patient to open their airway and are not able to ventilate the patient successfully, placement of an OPA is indicated.
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Airway - Nasopharyngeal

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Oropharyngeal airway - Wikipedia

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How do you measure an oral airway?

Click to see full answer Keeping this in consideration, how do you measure a nasopharyngeal airway? To determine the correct size , measure from the tip of your patient's nose to the tip of their earlobe. In addition, choose an NPA which has a diameter a little smaller than the patient's nares. The distal tip of the NPA is properly placed beyond the tongue base but should not be in contact with the epiglottis. Also, when should a nasopharyngeal airway not be used?
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Children with craniofacial conditions may need a nasopharyngeal airway. This page from Great Ormond Street Hospital GOSH explains about nasopharyngeal airways, why they might be needed for children with craniofacial conditions and how to look after them at home. Children can have a nasopharyngeal airway in one nostril. The middle area of their face — nose, upper and lower jaw and forehead — may be underdeveloped and their nasal passages may be narrower than usual.
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