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Cardiac Physiome Society workshop: November 6-9, 2017 , Toronto

# Compliant_bronchiole_compliant_alveolus

This model represents a compliant bronchiole with a compliant alveolar sac. The driving force for this model is a pressure gradient which represents the difference in the alveolar and the pleural pressures.

Model number: 0125

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## Description

``` This model represents a compliant bronchiole with a compliant alveolar sac.
The resistance offered by bronchial wall to the flow of air is represented by
the resistor in the model. The total resistance of the bronchiole is split into
two resistors in series to fecilitate smooth coupling of downstream circuits.
The compliance of the bronchiole is represented by the capacitor. The alveolar sac
compliance is repsented by a capcitor. The alveolar sac changes its volume as a
function of inlet flow or pressure. The driving force for this model is the pressure
gradient which represents the pressure difference between the alveolar sac and the
pleural pressure. Since this model lacks a pleural cavity, a positive pressure
gradient is imposed to drive the flow into the alveolar sac. The important difference
between this model and the rigid_bronchiole_compliant_alveolus model is the shape of
alveolar volume curve.

```

Legend:
Finlet: Inlet Flow, P: Pressure, R: Resistance, F: Flow, Com: Compliance, V: Volume.

## Equations

```Pinlet - P2 = Finlet * R1
F1 = Finlet - F2
P2 = (V1 - V1_0)/Com1
P2 - P3 = F1 * R2
P3 - P4 = F1 * R3
P4 = (V2 - V2_0)/Com2
d(V1)/dt = F2
d(V2)/dt = F1

Where: P is pressure, F is flow, R is resistance, Com is capacitance, and V is the volume.
```

## References

```      K. R. Lutchen and G. M. Saidel, "Estimation of mechanical parameters in multicompartment
models applied to normal and obstructed lungs during tidal breathing,"
IEEE Trans. Biomed. Eng., vol. BME-33, no. 9, pp. 878-887, Sept. 1986.

Fung Y.C.; Biomechanics (Text Book)

```

## Key Terms

Compliant Bronchiole, Bronchiolus, Alveolus, Alveolar sac, Respiratory system, respiratory mechanics, airway