A patient is receiving supplemental oxygen at a flow of 4 L/min. Assessment reveals that there is clouding of the mask. What step should be taken to resolve this situation?
a. Change to a nasal cannula at 2 L/min.
b. Increase the flow to 5 L/min.
c. Change to a 50% air-entrainment mask.
d. Increase the flow to 10% L/min.
ANS: B
The clouding of the mask shows there is CO2 retention in the mask. The minimum flow for a simple mask is 5 L/min. The other options would result in significant changes in the delivered FIO2.
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