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Pulmonary vascular resistance in the fluorocarbon-filled lung
Journal of Applied Physiology (Bethesda, Md. : 1985)
|January 1, 1986
Summary
Liquid ventilation with fluorocarbons increases pulmonary vascular resistance due to mechanical stress on lung tissue. This impacts blood flow distribution, highlighting challenges for liquid ventilation strategies.
Area of Science:
- Pulmonary Physiology
- Respiratory Mechanics
- Liquid Ventilation
Background:
- Liquid ventilation is an experimental form of respiratory support.
- Understanding its effects on pulmonary hemodynamics is crucial.
Purpose of the Study:
- To investigate the impact of fluorocarbon liquid ventilation on pulmonary vascular resistance (PVR).
- To assess regional pulmonary blood flow changes during liquid ventilation.
Main Methods:
- Used an in situ isolated cat lung preparation.
- Perfusion with whole blood at constant flow, with controlled left atrial pressure.
- Measured pulmonary arterial pressure to calculate PVR.
- Employed the microsphere technique for regional blood flow determination.
Main Results:
- Fluorocarbon-filled lungs showed higher alveolar pressure and shifted pressure-volume curves compared to gas-filled lungs.
- Pulmonary vascular resistance increased linearly with alveolar pressure, irrespective of the filling medium.
- PVR was consistently greater in fluorocarbon-filled lungs.
- Pulmonary blood flow redistributed, decreasing in dependent regions and increasing in less-dependent regions with fluorocarbon filling.
Conclusions:
- Liquid ventilation with fluorocarbons increases pulmonary vascular resistance.
- This increase is attributed to mechanical interactions at the alveolar-vascular interface.
- Altered blood flow distribution is a consequence of liquid ventilation.