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Experimental hydrostatic pulmonary edema in rabbit lungs. Morphology
H Bachofen1, S Schürch, R P Michel
1Department of Anatomy, University of Berne, Switzerland.
The American Review of Respiratory Disease
|April 1, 1993
Summary
Pulmonary edema distribution is uneven, not solely gravity-dependent, and varies regionally within lungs. This suggests complex fluid exchange beyond simple membrane models in lung edema.
Area of Science:
- Pulmonary Physiology
- Pathology
Background:
- Pulmonary edema involves fluid accumulation in lung interstitial and alveolar spaces.
- Understanding edema fluid distribution is crucial for diagnosing and treating lung injury.
Purpose of the Study:
- To investigate the distribution and accumulation patterns of edema fluid in rabbit lungs.
- To examine the impact of edema on alveolar microarchitecture.
- To evaluate the role of filtration pressure and gravity in pulmonary edema formation.
Main Methods:
- Edema was induced in excised rabbit lungs perfused with albumin solution.
- Lungs were fixed using glutaraldehyde, osmium tetroxide, and uranyl acetate.
- Tissue samples were analyzed using light and electron microscopy (transmission and scanning).
Main Results:
- Albumin in edema fluid formed webs, visualizing fluid accumulation.
- An apical to basal gradient of fluid accumulation was observed, independent of filtration pressure.
- Regional distribution was not solely gravity-dependent; inhomogeneity in fluid distribution was noted.
- Edema affected alveolar architecture and surface tension.
- Inequalities in fluid density suggested local differences in barrier permeability (reflection coefficients for albumin).
Conclusions:
- Pulmonary edema distribution is inhomogeneous and not solely gravity-dependent.
- Local variations in barrier permeability influence edema formation.
- Uniform membrane models are insufficient to explain pulmonary edema development.