If the respiratory therapist notices the reservoir bag on a nonrebreather mask is failing to partially collapse with each breath, the therapist should
A. remove the one-way valve disk
B. tighten the elastic straps on the mask
C. obtain a new nonrebreather mask
D. increase oxygen flow to the reservoir
Answer: B. For a patient who is breathing oxygen through a non-rebreather mask, failing to cause a partial collapse of the reservoir with each breath is an indication that either the mask is not tight enough or that the flow to the mask is excessive. It is most likely that the mask requires tightening, which can be done by pulling on the elastic straps.
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