How to calculate Airway Resistance ( Raw )
Raw = (PIP – Pplat) / Flow
During volume ventilation this equation will estimate the Airway Resistance (Raw). Larger factors influencing Airway resistance are airway diameter and if the air flow is laminar or turbulent.
- Raw – Airway resistance in cmH2o/L/sec
- PIP – Peak Inspiratory Pressure in cmH2O
- Pplat – Plateau Pressure in cmH2O
- Flow – Flow rate in L/sec
| PIP – Peak Inspiratory Pressure in cmH2O | |
| Pplat – Plateau Pressure in cmH2O | |
| Flow – Flow rate in L/sec | |
| Raw – Airway resistance in cmH2O/L/sec |
