Which nursing intervention would help prevent injury for a patient receiving oxygen therapy via continuous nasal cannula?

• A. Providing mouth care every 8 hours
• B. Wipe nares with alcohol
• C. Apply petroleum jelly to nares
• D. Encourage use of humidifier

Answer: (A)

Oxygen therapy via nasal cannula can dry the mucous membranes of the mouth and lips, leading to cracking, discomfort, and a higher risk of irritation or infection. Providing routine mouth care helps keep the oral tissues moist, removes debris, and protects against fissures and irritation, which reduces the potential for injury from the dry oxygen environment. This direct care of the oral mucosa addresses the dryness and discomfort that can accompany oxygen use, making it a practical, protective measure in daily nursing care.

Wiping nares with alcohol would dry and irritate the nasal mucosa and poses a fire risk with oxygen. Applying petroleum jelly to the nares is generally avoided in oxygen-rich settings due to flammability concerns and potential aspiration. Encouraging use of a humidifier can help moisten inspired air, but mouth care specifically targets moisture and comfort of the oral tissues, which is central to preventing tissue injury in this context.