After using a nasal cannula delivery system at 3 L/min, a patient with chronic airflow limitation (CAL) changes to a simple face mask. The nasal equipment oxygen was set at 3 L/min
How should the nurse adjust the oxygen flow for the new delivery system?
a. Decrease it to 2 L.
b. Keep it the same.
c. Increase it to 4 L.
d. Increase it to 6 L.
D
When changing to a mask from a nasal cannula, the oxygen should be increased by approximately 100% to get the same concentration. Simple face masks deliver approximately the same range of concentration of oxygen as the nasal cannula. However, the nasal cannula flow rates range from 1 to 6 L, delivering 24% to 44% oxygen, whereas the simple face mask delivers 35% to 50% oxygen which is achieved with flow rates from 6 to 12 L.
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