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Related Experiment Videos

Transcapillary fluid movement in human calf after drinking hypertonic saline.

I Matsubara

    The Journal of Physiology
    |March 1, 1972
    PubMed
    Summary

    Ingesting hypertonic saline causes transcapillary absorption of interstitial fluid into capillaries. This fluid shift is driven by osmotic pressure differences, not changes in plasma volume.

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    Area of Science:

    • Physiology
    • Fluid Dynamics
    • Human Physiology

    Background:

    • Understanding fluid exchange between blood capillaries and interstitial fluid is crucial for physiological regulation.
    • The impact of ingested substances on transcapillary fluid dynamics requires further investigation.

    Purpose of the Study:

    • To investigate the phenomenon of transcapillary absorption of interstitial fluid following the ingestion of hypertonic saline in humans.
    • To quantify the rate and extent of this fluid absorption and identify the underlying physiological mechanisms.

    Main Methods:

    • Utilized a pressure plethysmograph to measure transcapillary fluid absorption in the human calf.
    • Administered 200 ml of 5.1% hypertonic saline orally.
    • Measured capillary filtration coefficient (CFC) and capillary absorption pressure.

    Main Results:

    • Transcapillary absorption of interstitial fluid began within 15 minutes and lasted approximately 2 hours.
    • Maximum absorption rate was 0.019 ml/min per 100 ml tissue, with a total absorption of 1.11 ml/100 ml tissue in the calf.
    • Plasma osmotic pressure increased by 12.6 m-osmole/kg H2O, driving fluid absorption without altering plasma volume.

    Conclusions:

    • Ingestion of hypertonic saline induces transcapillary fluid absorption from the interstitial space into capillaries.
    • The primary driver of this fluid shift is the osmotic pressure gradient between plasma and interstitial fluid.
    • The volume of fluid absorbed into capillaries equals the volume secreted into the intestinal lumen, maintaining overall plasma volume.

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