The FIO2 that is actually delivered to the patient through an oxygen mask depends on which of the following?

1. Flow of the oxygen to the mask
2. Presence of a reservoir bag
3. Humidity of the gas
4. Density of the gas
a. 1 and 2 c. 1 and 4
b. 2 and 3 d. 3 and 4


ANS: A
The flow of oxygen to a reservoir mask determines the FIO2, as do the patient's breathing pattern and the presence or absence of a reservoir bag. Those masks with a reservoir bag will have a higher FIO2 than those without a reservoir bag.

Health Professions

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