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
B) 1:3
C) 1:4
D) 1:5

Question

Quizplus · Accepted Answer

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.
Total cycle time = 60 ÷ 10 = 6 s.Expiratory time = Total cycle time - Inspiratory time = 6 s - 1.19 s = 4.81 s.
Reduce the inspiratory time-to-expiratory time ratio to its simplest form; divide the numerator and the denominator by inspiratory time.
Inspiratory time/Expiratory time = 1.19 ÷ 1.19/4.81 ÷ 1.19 = 1:4.

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