Related Experiment Videos
Lymph flow and lung weight in isolated sheep lungs
Journal of Applied Physiology (Bethesda, Md. : 1985)
|November 1, 1986
Summary
Elevated left atrial pressure temporarily increases lung lymph flow and fluid filtration. However, excess lung water accumulation did not affect dynamic lung fluid balance, suggesting a two-compartment interstitial space.
Area of Science:
- Pulmonary Physiology
- Cardiovascular Research
- Fluid Dynamics
Background:
- Understanding lung fluid balance is crucial for treating pulmonary edema.
- The relationship between lung weight and lymphatic drainage dynamics requires further investigation.
Purpose of the Study:
- To investigate the impact of transient left atrial hypertension on lung weight and lymph flow.
- To determine if accumulated lung water influences dynamic fluid balance parameters.
Main Methods:
- Utilized an in situ, isolated sheep lung preparation for simultaneous measurement of lung weight and lymph flow.
- Maintained constant pulmonary perfusion rate while manipulating left atrial pressure.
- Measured pulmonary arterial pressure, lymph flow, and lymph-to-plasma oncotic pressure ratio.
Main Results:
- Left atrial hypertension transiently increased pulmonary arterial pressure, lymph flow, and fluid filtration.
- Excess lung water (135 ml) accumulated during hypertension persisted after pressure normalization.
- Dynamic fluid balance parameters (pressures, flow, weight gain rate) returned to baseline post-hypertension.
- Lymph-to-plasma oncotic pressure ratio decreased during hypertension.
Conclusions:
- Lung fluid accumulation does not appear to affect dynamic fluid balance regulation.
- Results support a two-compartment model of the interstitial space for lung fluid dynamics.
- Lymphatic drainage may preferentially access only one compartment of the interstitial space.