Which oxygen delivery device is typically used in the recovery room or ED for a short period when nasal cannula is insufficient?

• A. Nonrebreather mask
• B. Nasal cannula
• C. Partial rebreathing mask
• D. Simple face mask

Answer: (D)

When a patient needs more oxygen than a nasal cannula can provide but doesn’t require extremely high concentrations, a simple face mask is the practical next step. It’s quick and straightforward to apply in the recovery room or ED, and it delivers a higher and more reliable fraction of inspired oxygen than a nasal cannula—roughly 40–60% FiO2 when used at about 5–8 liters per minute. Because it covers the nose and mouth, it works well even if the patient breathes through the mouth, and it’s comfortable enough for short-term use while you reassess or arrange further care.

In contrast, devices like nonrebreather or partial rebreather masks can deliver higher oxygen levels (closer to 80–95% FiO2) but require a good seal and can be less comfortable for short-term use; they’re typically reserved for more significant hypoxemia or when very high oxygen concentrations are needed. A nasal cannula is limited to lower FiO2 and is insufficient when more support is required.