A patient is being administered supplemental oxygen with a 40% air-entrainment mask being powered with a flow of 6 L/min. The manufacturer recommends a flow of 4 L/min. Which of the following will occur with this change?
1. There will be an increase in the delivered FIO2.
2. There will be an increase in the total flow.
3. There will be a decrease in the total flow.
4. There will be no change in the FIO2.
a. 1, 2 c. 3, 4
b. 2, 4 d. 1, 3
ANS: B
The total flow from an air-entrainment mask will increase as the oxygen flow rate is increased. As long as the air:oxygen ratio is not changed, there will be no changes in the delivered FIO2.
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