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Related Experiment Videos

Intestinal microvascular exchange during lipid absorption.

D N Granger1, R J Korthuis, P R Kvietys

  • 1Department of Physiology, Louisiana State University Medical Center, Shreveport 71130.

The American Journal of Physiology
|November 1, 1988
PubMed
Summary

Lipid absorption significantly increases fluid movement and lymphatic flow in the cat jejunum. Capillaries remove most absorbed fluid, differing from glucose absorption effects.

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Area of Science:

  • Gastroenterology
  • Physiology
  • Microcirculation

Background:

  • Understanding fluid dynamics in the jejunum is crucial for nutrient absorption.
  • Oleic acid perfusion models lipid absorption in the gut.

Purpose of the Study:

  • To quantify transcapillary and lymphatic fluid fluxes during lipid absorption.
  • To compare fluid dynamics during lipid vs. glucose absorption.

Main Methods:

  • Measured net transmucosal fluid flux, lymph flow, capillary pressure (Pc), blood flow, capillary filtration coefficient (Kf,c), and oncotic pressures.
  • Calculated interstitial fluid pressure before and during oleic acid perfusion in cat jejunum.

Main Results:

  • Lipid absorption increased lymph flow fivefold and Kf,c threefold.

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  • Capillary pressure rose by 2.5 mmHg; interstitial fluid pressure increased by 3.6 mmHg.
  • Lymphatics removed 35% of absorbed fluid, capillaries removed 65%.

    • Conclusions:

    • Lipid absorption alters microvascular and lymphatic fluid dynamics differently than glucose absorption.
    • Increased blood flow and microvascular permeability explain these differences.