Which statement describes the simple face mask usage?

Which statement describes the simple face mask usage?

• A. It should be used at 2-4 L/min
• B. 6-10 L/min; minimum flow of 6 L/min to prevent rebreathing; typically used in recovery room or ED for short period when nasal cannula is insufficient
• C. It is only used for long-term therapy
• D. It delivers FiO2 of 60-100%

Answer: (B)

The key idea is that a simple face mask delivers a moderate oxygen concentration and must be run at a relatively high flow to prevent rebreathing of exhaled air. For a simple mask, using about 6–10 L/min (with a minimum around 6 L/min) keeps the flow high enough to wash out exhaled carbon dioxide and avoid rebreathing, making it suitable when the nasal cannula isn’t enough but you don’t need a high-flow device. This setup is common in short-term settings like the recovery room or ED. It does not provide very high oxygen levels, typically delivering roughly 40–60% FiO2, and it isn’t intended for long-term use. Lower flows (like 2–4 L/min) can lead to rebreathing and inadequate oxygen delivery, and delivering 60–100% FiO2 is more characteristic of a nonrebreather mask or other high- FiO2 devices, not a simple mask.

The key idea is that a simple face mask delivers a moderate oxygen concentration and must be run at a relatively high flow to prevent rebreathing of exhaled air. For a simple mask, using about 6–10 L/min (with a minimum around 6 L/min) keeps the flow high enough to wash out exhaled carbon dioxide and avoid rebreathing, making it suitable when the nasal cannula isn’t enough but you don’t need a high-flow device. This setup is common in short-term settings like the recovery room or ED.

It does not provide very high oxygen levels, typically delivering roughly 40–60% FiO2, and it isn’t intended for long-term use. Lower flows (like 2–4 L/min) can lead to rebreathing and inadequate oxygen delivery, and delivering 60–100% FiO2 is more characteristic of a nonrebreather mask or other high- FiO2 devices, not a simple mask.