What is one contraindication for the use of a nasopharyngeal airway?

The use of a nasopharyngeal airway is contraindicated in cases of nasal obstructions. This is because the device is designed to be inserted into the nasal passage and extend into the pharynx to maintain an open airway. When there is an obstruction in the nasal passage, such as swelling, bleeding, or a mass, the insertion of the airway may be difficult or impossible and can lead to further injury or complications. Additionally, inserting an airway against an obstruction can also cause trauma to the nasal structures and lead to impaired ventilation. In such scenarios, alternative airway management strategies should be considered.