Question

If tube  compressibility of 2 mL of gas lost for each 1 cm H2O, and the...

If tube  compressibility of 2 mL of gas lost for each 1 cm H2O, and the patient PIP = 22 cm, and their tidal volume = 400 ml. How much gas volume is lost in vent tube?
12 mL
36 mL
44 mL
Cannot determine

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Answer #1

The amount of volume lost to the circuit equals the pressure reached during a tidal volume (VT) delivery multiplied by the tubing compliance (CT) factor

Tube compressibility factor - 2ml/cm H2O

PIP - 22cm

Amount of gas volume lost in vent tube = 2×22

= 44ml

The correct option is c)

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