What is the volume that will reach the patient when the volume setting is 700 mL, the tubing compliance is 2 mL/cm H2O, and the measured peak inspiratory pressure is 35 cm H2O?
a. 770 mL c. 665 mL
b. 698 mL d. 630 mL
ANS: D
Volume lost because of tubing compliance is equal to the set volume minus the tubing compliance multiplied by the measured peak inspiratory pressure. Volume lost = 700 mL ?2- (2 mL/cm H2O ? 35 cm H2O) = 700 mL ?2- 70 mL = 630 mL.
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