A patient is receiving supplemental oxygen via a 30% air-entrainment mask set at 8 L/min. The respiratory therapist must increase the supplemental oxygen to 40%. To maintain the same total output, the flow rate must be increased to _____ L/min
a. 10 c. 16
b. 14 d. 18
ANS: D
The output for the 30% air-entrainment mask set at 8 L/min is 72 L/min, because 30% has nine total parts multiplied by 8 L/min, which equals 72 L/min. The total output for 40% should, therefore, be 72 L/min. There are four total parts in 40% multiplied by an unknown flow that equals 72 L/min. 4X = 72. X is equal to 18 L/min.
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