What is the flow rate if the set volume is 550 mL and the inspiratory time is 1.2 second?

a. 27.5 L/min c. 55 L/min
b. 45.8 L/min d. 66 L/min


ANS: A
Volume = Flow ? Time, so Flow = Volume ÷ Time. 550 mL = 0.55 L. Flow = 0.55 L ÷ 1.2 s = 0.46 L/s ? 60 = 27.5 L/min.

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