What is the static lung compliance when the returned tidal volume is 460 mL, the positive end-expiratory pressure is 8 cm H2O, the peak inspiratory pressure is 27 cm H2O, and the plateau pressure is 18 cm H2O?
a. 20 mL/cm H2O c. 46 mL/cm H2O
b. 26 mL/cm H2O d. 51 mL/cm H2O
ANS: B
Static lung compliance = Volume ÷ (Plateau pressure – Positive end-expiratory pressure) = 460 mL ÷ (18 cm H2O – 8 cm H2O) = 460 mL ÷ 10 cm H2O = 46 mL/cm H2O.
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