What is the compressibility factor for the patient circuit when the ventilator volume is set at 100 mL, the recorded peak inspiratory pressure is 41 cm H2O, and the measured volume is 68 mL?

a. 0.41 cm H2O/mL c. 1.66 mL/cm H2O
b. 0.60 cm H2O/mL d. 2.44 mL/cm H2O


ANS: C
The compressibility factor of a patient circuit is the circuit's tubing compliance. Tubing compli-ance equals the measured volume divided by the measured peak inspiratory pressure (Tubing compliance = Volume/Peak inspiratory pressure). Tubing compliance = 68 mL ÷ 41 cm H2O = 1.66 mL/cm H2O.

Health Professions

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