A patient-ventilator system check reveals the following information: peak inspiratory pressure (PIP) 27 cm H2O, positive end-expiratory pressure (PEEP) 5 cm H2O, plateau pressure (Pplateau) 14 cm H2O,

inspiratory time (TI) 0.75 second, and set frequency 20/minute. Calculate the mean airway pres-sure.
a. 6.75 cm H2O
b. 7.75 cm H2O
c. 11.75 cm H2O
d. 12.37 cm H2O

ANS: B
Total cycle time (TCT) = 60/frequency = 60/20 = 3 seconds. (P-macron)aw = [(PIP − PEEP) ? (TI/TCT)] + PEEP = [(27 − 5) ? (0.75/3)] + 5 = (22 ? 0.25) + 5 = 7.75 cm H2O.

Health Professions

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