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Lessons from fatal re-expansion pulmonary oedema: case series
Dambuza Nyamande1, Siphosenkosi Mazibuko1
1Sefako Makgatho Health Sciences University, Pretoria, South Africa.
Interactive Cardiovascular and Thoracic Surgery
|December 28, 2021
Summary
Severe re-expansion pulmonary edema involves porous alveolar-capillary membranes. Airway fluid analysis revealed plasma components, but no blood cells, suggesting a selective filtration barrier.
Area of Science:
- Pulmonary Medicine
- Respiratory Physiology
- Pathology
Background:
- Re-expansion pulmonary edema (RPEO) is a rare but serious complication following pleural effusion or pneumothorax drainage.
- The precise mechanisms and structural integrity of the alveolar-capillary membrane in RPEO remain incompletely understood.
Purpose of the Study:
- To investigate the porosity and functional characteristics of the alveolar-capillary membrane in patients with severe re-expansion pulmonary edema.
- To compare the biochemical composition of airway fluid with plasma in RPEO patients.
Main Methods:
- Biochemical analysis of airway fluid and blood plasma from two patients deceased from severe re-expansion pulmonary edema.
- Microscopic examination to detect the presence of blood cells in the airway fluid.
Main Results:
- Airway fluid biochemistry was found to be comparable to plasma in the studied patients.
- No intact blood cells were detected in the airway fluid, indicating they did not cross the alveolar-capillary membrane.
- The alveolar-capillary membrane acted as a selective barrier, allowing plasma components to pass while retaining blood cells.
Conclusions:
- The alveolar-capillary membrane in severe re-expansion pulmonary edema exhibits significant porosity, allowing plasma-like fluid to traverse.
- Despite fluid passage, the membrane retains its integrity against cellular components, functioning as a size-selective filter.
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