Related Experiment Videos
Lung lymphatics cast from the airspace
K D Hainis1, J I Sznajder, D E Schraufnagel
1Section of Pulmonary and Critical Care Medicine, Michael Reese Hospital, Chicago, Illinois.
The American Journal of Physiology
|August 1, 1994
Summary
Pulmonary lymphatic vessels expand during lung injury caused by hyperoxia. These lymphatic compartments return to normal after returning to ambient air, indicating their role in resolving lung edema.
Area of Science:
- Pulmonary Medicine
- Anatomy
- Pathology
Background:
- Lymphatics are crucial for resolving pulmonary edema.
- The specific lymphatic pathways involved in alveolar fluid drainage and their response to lung injury remain unclear.
Purpose of the Study:
- To investigate the role of lung lymphatics in resolving pulmonary edema.
- To characterize changes in lymphatic anatomy during hyperoxic lung injury and recovery.
Main Methods:
- Rats were exposed to hyperoxia (85% O2 for 7 days) and their lungs analyzed at various time points.
- Lung lymphatic anatomy was visualized using methyl methacrylate casting and scanning electron microscopy.
- Control rats breathed ambient air.
Main Results:
- Hyperoxia induced diffuse lung damage and edema.
- Lymphatic vessels around bronchioles, arteries, and on the pleural surface were significantly increased in hyperoxia-exposed rats compared to controls.
- Distinct lymphatic compartments (peribronchial, periarterial, perivenous) were identified, connecting to conduit lymphatics.
- Lymphatic structures normalized 14 days after returning to ambient air.
Conclusions:
- Airway casting provides a 3D view of lung lymphatics, revealing their expansion during hyperoxic injury.
- Peribronchial and perivascular saccular lymphatics connect to conduit lymphatics within the bronchoalveolar bundle.
- Lung lymphatics play a significant role in the resolution of pulmonary edema.