Nasopharyngeal airways without an adjustable flange

For an NPA without an adjustable flange, the correct size is more accurately determined by the length rather than bore of the adjunct. The distance from the nostril to the tragus has been shown to correlate well with the length from the nostril to the vocal cords in normal infants and children and is our preferred method for sizing. Alternatively, the distance from the nostril to the mandible may be used. However, the accuracy of this method has not been studied.