Calculate the dynamic compliance given the following clinical data: tidal volume 500 mL, peak inspiratory time (PIP) 35 cm H2O, plateau pressure (Pplateau) 20 cm H2O, positive end-expiratory pressure (PEEP) 5 cm H2O,
and tubing compliance (CT) 2.5 mL/cm H2O.
a. 11.8 mL/cm H2O
b. 14.2 mL/cm H2O
c. 25 mL/cm H2O
d. 46.2 mL/cm H2O
ANS: B
Dynamic compliance = tidal volume (VT) − [(PIP − PEEP) ? CT]/(PIP − PEEP) = 500 − [(35 − 5) ? 2.5]/(35 − 5) = 14.2 mL/cm H2O.
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