Which oxygen delivery device can dry out airways and cause nose bleeds at higher flows?

Which oxygen delivery device can dry out airways and cause nose bleeds at higher flows?

• A. Venturi mask
• B. Simple mask
• C. Standard nasal cannula
• D. Non-rebreather mask

Answer: (C)

The main idea is that dry oxygen delivered through the nose can irritate and dry the nasal mucosa, especially at higher flow rates. A nasal cannula sends gas directly into the nostrils, so when you push up the flow without humidification, the dry oxygen can dehydrate the mucosa, leading to crusting and nosebleeds. Masks sit over the nose and mouth and are often used with humidified systems or in ways that don’t expose the nasal passages as directly, so dryness and bleeding are less likely to be the main issue at typical use. In clinical practice, if you need higher flows through a nasal cannula, humidification is important to prevent drying and epistaxis.

The main idea is that dry oxygen delivered through the nose can irritate and dry the nasal mucosa, especially at higher flow rates. A nasal cannula sends gas directly into the nostrils, so when you push up the flow without humidification, the dry oxygen can dehydrate the mucosa, leading to crusting and nosebleeds. Masks sit over the nose and mouth and are often used with humidified systems or in ways that don’t expose the nasal passages as directly, so dryness and bleeding are less likely to be the main issue at typical use. In clinical practice, if you need higher flows through a nasal cannula, humidification is important to prevent drying and epistaxis.