A patient being ventilated in the volume-controlled continuous mandatory ventilation mode had a measured tidal volume of 620 mL for the breath shown in the pressure-time scalar in the figure. What is the static compliance?
a. 18 mL/cm H2O c. 31 mL/cm H2O
b. 21 mL/cm H2O d. 62 mL/cm H2O
ANS: C
Static lung compliance = Tidal volume ÷ (Plateau pressure – Positive end-expiratory pressure) = 620 mL ÷ (30 cm H2O – 10 cm H2O) = 31 mL/cm H2O.
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