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Role of the interstitial matrix during intestinal volume absorption
The American Journal of Physiology
|March 1, 1980
Summary
Net volume absorption increases intestinal interstitial fluid volume and lymph flow, while decreasing albumin exclusion. The rate of absorption dictates the extent of these changes, enhancing fluid removal.
Area of Science:
- Gastroenterology
- Physiology
- Biophysics
Background:
- Intestinal fluid dynamics are crucial for nutrient absorption and waste removal.
- Understanding interstitial space changes during absorption is key to intestinal function.
Purpose of the Study:
- To investigate the impact of net volume absorption rate on intestinal interstitial fluid volume, lymph flow, and albumin exclusion.
- To elucidate the relationship between absorption rate and changes in the interstitial matrix.
Main Methods:
- Utilized an autoperfused cat ileum preparation.
- Employed radiolabeled tracers (51Cr-RBCs, 99mTc-DTPA, 125I-HSA) to quantify tissue blood volume, extracellular space, and extracellular albumin.
- Measured net volume absorption rate (Jv,m), interstitial fluid volume (VI), lymph flow (JL), and excluded volume fraction for interstitial albumin (FE).
Main Results:
- Established baseline nonabsorptive values: VI (27.8 ml/100 g), VA (18.2 ml/100 g), and FE (0.37).
- Demonstrated that net volume absorption increases intestinal interstitial volume and lymph flow.
- Showed that net volume absorption decreases albumin exclusion within the interstitial matrix.
Conclusions:
- The rate of net volume absorption directly correlates with the magnitude of changes in interstitial volume, lymph flow, and albumin exclusion.
- Increased matrix hydration during absorption facilitates vascular and lymphatic removal of absorbed fluid.