🌬️ Dynamic Respiratory Compliance (Cdyn)
UseWhen to use: ventilated patients when comparing resistive vs elastic loads with Cstat.
StrataFalling Cdyn with stable Cstat favors airway resistance; falling both favors stiff lungs/chest wall.
LimitsWhen not to use: active patient effort. · Pitfall: swapping PIP for Pplat. · ≠ Cstat.
SourceStandard dynamic compliance teaching formula
This-shift next steps
After scoring: open the scene pack, peer scores, and the matching pathway. Local reference — no HIS write.
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Methodology · worked example, guidelines & full notes
VT/(PIP−PEEP).
When to use
When to use: ventilated patients when comparing resistive vs elastic loads with Cstat.
How it works
Cdyn = VT / (PIP − total PEEP).
Key points
- VT/(PIP−PEEP).
- Includes resistance.
- Next: Raw / Cstat.
References
- Standard dynamic compliance teaching formula
Worked calculation
The values below come from this tool's own example placeholders and are computed server-side with the formula shown on this page, so the arithmetic can be checked quickly. It demonstrates how to substitute values only — it is not clinical advice and not a real case.
| Tidal volume (VT) | 400 mL |
|---|---|
| Peak inspiratory pressure (PIP) | 28 cmH₂O |
| Total PEEP | 8 cmH₂O |
→Cdyn20.0mL/cmH₂O
- PIP−PEEP：20.0 cmH₂O
- Cue：20–39 — reduced Cdyn band (resistance and/or compliance cues)
Verification & sources · governance
FAQ
Frequently asked questions
- Does Dynamic Respiratory Compliance (Cdyn) upload patient data? Where is it calculated?
- Calculation runs locally in the browser; inputs and results are not uploaded. For licensed clinicians only; interpret with history, investigations and local protocols — not a diagnosis or prescription.
- How is Dynamic Respiratory Compliance (Cdyn) calculated in practice? Can you show a worked example?
- Inputs: Tidal volume (VT) 400 mL, Peak inspiratory pressure (PIP) 28 cmH₂O, Total PEEP 8 cmH₂O → Result: Cdyn 20.0 mL/cmH₂O（PIP−PEEP: 20.0 cmH₂O, Cue: 20–39 — reduced Cdyn band (resistance and/or compliance cues)）