Critical Care
Dynamic Compliance (Cdyn), Static Compliance (Cstat) & Airway Resistance (Raw) Calculator
Calculates Cdyn, Cstat, and Raw to differentiate resistive vs elastic respiratory mechanics in mechanical ventilation.
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Parameters
Dynamic Compliance (Cdyn), Static Compliance (Cstat) & Airway Resistance (Raw) Calculator Result
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Formula
Static Compliance: Cstat = VT ÷ (Pplat - PEEP) [Normal: 50–80 mL/cmH₂O]
Dynamic Compliance: Cdyn = VT ÷ (Ppeak - PEEP) [Normal: 30–40 mL/cmH₂O]
Airway Resistance: Raw = (Ppeak - Pplat) ÷ Inspiratory Flow (L/s) [Normal: 5–10 cmH₂O/(L/s)]
Driving Pressure: ΔP = Pplat - PEEP [Goal: ≤ 14 cmH₂O]Clinical Pearls
The premier physiological troubleshooting tool in mechanical ventilation, identifying ventilator-induced lung injury (VILI) risk in real time.
Limitations
Plateau pressure measurement requires an active inspiratory hold during passive ventilation; spontaneous breathing efforts generate misleading artifact.