The operational verification procedure (OVP) involves checking the ventilator circuit for leaks. Ventilator settings that could be used to perform this procedure include which of the following?
a. Tidal volume (VT) = 500 mL, Flow rate = 60 L/min, High pressure limit = 50 cm H2O
b. VT = 1000 mL, Flow rate = 20 L/min, High pressure limit = maximum
c. VT = 500 mL, Flow rate = 20 L/min, High pressure limit = maximum, Inspiratory pause = 2 seconds
d. VT = 200 mL, Flow rate = Maximum, High pressure limit = 50 cm H2O, Inspira-tory pause = 1 second
ANS: C
To check for leaks in the ventilator circuit the operator should set the tidal volume to 500 mL, the gas flow low (e.g., 20 L/min), the maximum pressure limit high (e.g., 100-120 cm H2O), and an inspiratory pause of 1-2 seconds.
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