Question

A patient on VC, SIMV with a VT of 500 mL has a PIP of 25 cm H₂O, Pplat of 15 cm H₂O and PEEP of 5 cm H₂O. What is the patient's static lung compliance?

1) 25 mL/cm H₂O
2) 35 mL/cm H₂O
3) 45 mL/cm H₂O
4) 50 mL/cm H₂O

Answer 1

The patient's static lung compliance is 50 mL/cm H₂O.

Step-by-step explanation:

The static lung compliance of a patient can be calculated using the formula:

Static Compliance = Tidal Volume (VT) / (Plateau Pressure (Pplat) - PEEP)

Given that the VT is 500 mL, the Pplat is 15 cm H₂O, and the PEEP is 5 cm H₂O, we can substitute these values into the formula:

Static Compliance = 500 mL / (15 cm H₂O - 5 cm H₂O) = 500 mL / 10 cm H₂O = 50 mL/cm H₂O

Therefore, the patient's static lung compliance is 50 mL/cm H₂O, which corresponds to option 4.