A patient-ventilator system check reveals the following information: peak inspiratory pressure (PIP) 32 cm H2O, positive end-expiratory pressure (PEEP) 12 cm H2O, plateau pressure (Pplateau) 20 cm H2O,
inspiratory time (TI) 1 second, and set frequency 12/min. Calculate the mean airway pressure.
a. 4 cm H2O
b. 8 cm H2O
c. 12 cm H2O
d. 14 cm H2O
ANS: D
Total cycle time (TCT) = 60/frequency = 60/12 = 5. (P-macron)aw = [(PIP − PEEP) ? (TI/TCT)] + PEEP = [(32 − 12) ? (1/5)] + 12 = (20 ? 0.2) + 12 = 14 cm H2O.
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