A bag valve mask (ambu-bag) delivers FiO2 up to what value?

A bag valve mask (ambu-bag) delivers FiO2 up to what value?

• A. 0.21
• B. 0.40
• C. 1.00
• D. 0.80

Answer: (C)

FiO2 with a bag-valve mask depends on how you supply oxygen and whether a reservoir is used. When the bag is filled with oxygen from a high-flow source and you maintain a good seal with a reservoir, you can deliver almost pure oxygen to the patient, approaching 100 percent. That is why the maximum possible FiO2 in this setup is 1.00. In real-life use, tiny leaks and imperfect seals mean you may not hit exactly 1.00, but the theoretical maximum remains 1.00. The other values reflect setups without optimal reservoir and seal, where room air is entrained and the FiO2 is lower.

FiO2 with a bag-valve mask depends on how you supply oxygen and whether a reservoir is used. When the bag is filled with oxygen from a high-flow source and you maintain a good seal with a reservoir, you can deliver almost pure oxygen to the patient, approaching 100 percent. That is why the maximum possible FiO2 in this setup is 1.00. In real-life use, tiny leaks and imperfect seals mean you may not hit exactly 1.00, but the theoretical maximum remains 1.00. The other values reflect setups without optimal reservoir and seal, where room air is entrained and the FiO2 is lower.