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Related Experiment Videos

Ion concentrations in subcutaneous interstitial fluid: measured versus expected values.

M Gilányi1, C Ikrényi, J Fekete

  • 1Experimental Research Department, Semmelweis University Medical School, Budapest, Hungary.

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

Interstitial fluid electrolyte concentrations differ from plasma ultrafiltrates due to Donnan equilibrium, not protein influence. Proteins have negligible impact on small ion distribution in interstitial fluid.

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Area of Science:

  • Physiology
  • Biophysics

Background:

  • Electrolyte concentrations in interstitial fluid (ISF) often differ from plasma ultrafiltrates.
  • Existing explanations for this discrepancy are inadequate.

Purpose of the Study:

  • To investigate the reasons behind the differing electrolyte concentrations between plasma and ISF.
  • To determine the influence of proteins on ion distribution in ISF.

Main Methods:

  • Collected subcutaneous ISF samples from rats using implanted capsules and liquid paraffin cavities.
  • Analyzed samples for sodium, potassium, calcium, chloride, and protein concentrations.
  • Constructed a theoretical model for ion distribution based on measured concentrations.

Main Results:

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  • Ion distribution between vascular and interstitial compartments aligned with the Donnan equilibrium.
  • Theoretical analysis indicated Donnan equilibrium is valid for large "free-fluid spaces" relative to electrostatic interaction ranges.
  • Protein concentration differences between plasma and ISF are small and have a negligible effect on small ion distribution.

    • Conclusions:

    • The Donnan equilibrium accurately describes ion distribution between plasma and ISF.
    • Proteins do not significantly influence small ion distribution in ISF due to their low concentration difference and short-range electrostatic interactions.