The LPN is assigned to monitor a patient with chronic lung disease who is receiving oxygen via a nonrebreathing mask. Which of the following observations tells the nurse that the system is functioning as expected?
a. Both side vents closed, reservoir bag inflated
b. Both side vents closed, reservoir bag deflated
c. Both side vents open, reservoir bag inflated
d. Both side vents open, reservoir bag deflated
ANS: A
A nonrebreather mask has one or both side vents closed to limit the mixing of room air with oxygen. The vents open to allow expiration but remain closed on inspiration. The reservoir bag has a valve to store oxygen for inspiration but does not allow entry of exhaled air. It is used to deliver oxygen concentrations of 70% to 100%. When a patient is using a partial rebreather or nonrebreather mask, ensure that the reservoir is never allowed to collapse to less than half full.
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