Which of the following represents the safe starting point for pressure support of a patient just placed on volume-controlled intermittent mandatory ventilation with the following set and measured parameters:
tidal volume, 475 mL; peak inspiratory pressure, 30 cm H2O; plateau pressure, 10 cm H2O; and flow rate, 45 L/min?
a. 4 cm H2O c. 20 cm H2O
b. 7 cm H2O d. 27 cm H2O
ANS: C
The safe starting point for pressure support is the transairway pressure value (Peak inspiratory pressure – Plateau pressure). In this case, transairway pressure = 30 cm H2O – 10 cm H2O = 20 cm H2O.
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