The patient with chronic airflow limitation (CAL) changed to the use of a simple face mask from a nasal cannula delivery system. The nasal equipment oxygen was set at 3 L/min
The nurse in-structs the patient that, with the change in delivery systems, the oxygen should be _____ L/min. a. decreased to 2
b. decreased to 1
c. increased to 4
d. increased to 6
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 L 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 L to 12 L.
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