ToolsCalculators
Static Lung Compliance (Cstat)
Respiratory-system compliance from tidal volume and driving pressure.
Static Lung Compliance (Cstat)
Tidal volume
mL
Plateau pressure
cmH2O
PEEP (total)
cmH2O
Complete the fields above to see the result.
When to use
- Tracking respiratory mechanics and lung stiffness in mechanically ventilated patients.
Formula
Cstat = tidal volume / (plateau pressure - total PEEP). Normal is roughly 50-100 mL/cmH2O.
Pearls and pitfalls
- Measure plateau pressure during an end-inspiratory hold with no spontaneous effort.
- Driving pressure (Pplat - PEEP) above ~15 cmH2O is associated with worse ARDS outcomes.