The normal pleural pressure is approximately -3 to -5 cmH2O at functional residual capacity (FRC).
Understanding Pleural Pressure
Pleural pressure is the pressure within the pleural space, the area between the lung and the chest wall. This pressure is normally negative, which helps to keep the lungs inflated.
Factors Influencing Pleural Pressure
The negative pressure in the pleural space results from the opposing elastic recoil forces of the lung and the chest wall [1].
Measurement and Significance
- Pleural pressure is typically measured in centimeters of water (cmH2O).
- The normal range at FRC is between -3 and -5 cmH2O [1].
- Changes in pleural pressure can indicate various respiratory conditions.
Conditions Affecting Pleural Pressure
Several conditions can affect pleural pressure, including:
- Pneumothorax: Air enters the pleural space, increasing the pressure and potentially collapsing the lung.
- Pleural Effusion: Fluid accumulates in the pleural space, which can also alter the pressure dynamics.
Summary Table
| Feature | Description |
|---|---|
| Normal Range | -3 to -5 cmH2O at FRC |
| Location | Pleural space (between the lung and chest wall) |
| Significance | Keeps the lungs inflated by creating a negative pressure. |
| Influencing Force | Elastic recoil forces of the lung and chest wall. |
