A patient receiving oxygen by nasal cannula set at 3 L/min is having difficulty maintaining an adequate oxygen saturation. Minute ventilation is 15 L/min. The therapist should do which of the following to ensure adequate oxygenation of the patient?
A. non-invasive positive pressure ventilation
B. Increase flow to 5 L/min
C. Place patient on Venturi mask at 32%
D. Change to a partial rebreathing mask
Answer: C. 3 L/min by nasal cannula approximates 30 to 34% oxygen percentage. With a nasal cannula, 1 L approximates a 3-4% change in oxygen.
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