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Subatmospheric pressure in the rabbit pleural lymphatic network
1Istituto di Fisiologia Umana I, Facoltà di Medicina e Chirurgia, Università degli Studi di Milano, 20133 Milano, Italy.
The Journal of Physiology
|November 2, 1999
Summary
Pleural lymphatic vessels generate pressure oscillations, driven by both heartbeats and intrinsic contractions. These pressures facilitate fluid movement from the pleural space into the lymphatic system.
Area of Science:
- Physiology
- Lymphatic System Dynamics
- Pleural Space Research
Background:
- The pleural space contains lymphatic vessels crucial for fluid balance.
- Understanding lymphatic pressure dynamics is key to respiratory and fluid regulation.
Purpose of the Study:
- To measure hydraulic pressure within intercostal and diaphragmatic lymphatic vessels.
- To investigate the factors influencing pleural lymphatic pressure oscillations.
Main Methods:
- Micropuncture technique used in 23 anesthetized rabbits.
- Observation of pleural lymphatic vessels (55-950 microm) via stereomicroscope after fluorescent dextran injection.
- Measurement of lymphatic pressure (Pmin, Pmax) and pleural liquid pressure.
Main Results:
- Lymphatic pressure oscillated in phase with cardiac activity and lymphatic myogenic activity.
- Submesothelial diaphragmatic lymphatic pressure (Pmin: -9.1 ± 4.2 mmHg) was more subatmospheric than pleural liquid pressure (Pmin: -3.9 ± 1.2 mmHg).
- Cardiogenic oscillations averaged 5 mmHg; intrinsic contractions generated 7 mmHg waves at 8 cycles/min.
Conclusions:
- Pleural lymphatic vessels can generate pressure oscillations.
- These oscillations drive fluid from the subatmospheric pleural space into the lymphatic network.
- Demonstrates the active role of pleural lymphatics in fluid transport.
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