Compliance calculations

Lung compliance (l/cmH2O) = AVL/APL where L, the litre above FRC, is the slope of the linear portion of the curve.

Total respiratory system compliance is derived from the equation:

(1/total compliance) = (1/lung compliance) + (1/chest wall compliance)

Total compliance can be calculated in well sedated, ventilated patients as:

tidal volume/(end-inspiratory pause pressure - PEEP).

P.97

Volume

Volume

Pressure

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