A patient is receiving O2 through a nonrebreathing mask set at 8 L/min. You notice that the mask's reservoir bag collapses completely before the end of each inspiration. Which of the fol-lowing actions is appropriate in this case?
a. Change to a partial rebreather.
b. Decrease the liter flow.
c. Increase the liter flow.
d. Change to a simple mask.
Q. 2 Which of the following are true about air-entrainment systems?
1. Their FiO2 values are directly proportional to their total flow.
2. They can provide variable FiO2 values under some clinical conditions.
3. They always deliver O2 concentrations less than 100.
4. They yield a set FiO2 only if their flow exceeds the patient's.
a. 1 and 3 only
b. 1, 2, and 3 only
c. 3 and 4 only
d. 2, 3, and 4 only
Q. 3 A well-fitted nonrebreathing mask, adjusted so that the patient's inhalation does not deflate the bag (flows approximately 10 L/min), should provide inspired O2 concentrations in what range?
a. 55 to 70
b. 45 to 60
c. 75 to 90
d. 70 to 85
Q. 4 A physician orders 2 L/min O2 through a simple mask to a 33-year-old postoperative woman with moderate hypoxemia breathing room air (PaO2 = 52 mm Hg). What would be the correct action at this time?
a. Carry out the physician's prescription ex-actly as written.
b. Recommend that the mask be changed to a cannula at 2 L/min.
c. Recommend a flow of at least 5 L/min to washout carbon dioxide (CO2).
d. Do not apply the O2 until the medical di-rector has been contacted.
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