When is it contraindicated to use a nasopharyngeal airway?

A nasopharyngeal airway is not appropriate to use when clear cerebrospinal fluid is draining from the nose or ears. This situation indicates a potential skull base fracture or severe head trauma, which could lead to further complications if an airway is improperly placed. In such cases, the insertion of the nasopharyngeal airway may disrupt the protective barriers of the central nervous system, increasing the risk of infection or exacerbating the injury.

The use of a nasopharyngeal airway is typically acceptable in unconscious patients, provided there are no contraindications such as facial injuries or significant bleeding, and it can be beneficial in cases of airway obstruction. A history of allergies generally does not affect the use of the nasopharyngeal airway, and an obstructed airway may still necessitate other interventions but doesn't directly contraindicate its use unless there are specific circumstances.