How much volume is lost in the ventilator circuit when the volume is set at 500 mL, the peak in-spiratory pressure is 40 cm H2O, and the tubing compliance is 3 mL/cm H2O?
a. 380 mL c. 150 mL
b. 280 mL d. 120 mL
ANS: D
Volume lost in the ventilator circuit equals tubing compliance multiplied by the measured peak inspiratory pressure. Volume lost = 3 mL/cm H2O ? 40 cm H2O = 120 mL.
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