What is the expiratory time when the tidal volume is 700 mL, the flow rate is 50 L/min, and the inspiratory time-to-expiratory time ratio is 1:3?
a. 0.42 second c. 2.52 seconds
b. 0.70 second d. 4.67 seconds
ANS: C
Inspiratory time = Tidal volume (in liters) ÷ Flow rate (in liters/second) = 0.7 L ÷ 0.83 L/s = 0.84 s. Expiratory time = 3 ? Inspiratory time = 3 ? 0.84 = 2.52 s.
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