What is the inspiratory time-to-expiratory time ratio for the following ventilator settings: a minute volume of 8 L/min, a respiratory rate of 10 breaths/min, and a flow rate of 40 L/min?
a. 1:2 c. 1:4
b. 1:3 d. 1:5
ANS: C
40 L/min = 40 ÷ 60 L/s = 0.67 L/s. Tidal volume = VE ÷ f = 8 L/min ÷ 10 = 0.8 L. Inspiratory time = Tidal volume (in liters) ÷ Flow rate (in liters/second) = 0.8 L ÷ 0.67 L/s = 1.19 s.
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