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Related Experiment Videos

Dextran and capillary filtration coefficient in cat hindlimb.

P D Watson, M B Wolf

    The American Journal of Physiology
    |April 1, 1985
    PubMed
    Summary

    Dextran reduces capillary filtration coefficient (CFC) by blocking transcapillary channels, not just by increasing viscosity. This finding clarifies dextran

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    Area of Science:

    • Physiology
    • Biomedical Engineering
    • Pharmacology

    Background:

    • Capillary filtration coefficient (CFC) is a key indicator of microvascular permeability.
    • Dextran is often used in fluid resuscitation but its precise effects on capillary function are not fully understood.

    Purpose of the Study:

    • To investigate the mechanisms by which dextran influences capillary filtration coefficient (CFC).
    • To differentiate between viscosity effects and channel blocking effects of dextran on capillary permeability.

    Main Methods:

    • Isolated cat hindlimb model used to measure CFC.
    • Perfusion with control blood-albumin mixture, Ringer-like solution (dialysate), and dextran in dialysate.
    • CFC calculated from limb weight gain after venous pressure increase.

    Main Results:

    • Dextran perfusion increased CFC to 2.0 times control, significantly less than dialysate alone (3.1 times control).
    • Subsequent perfusion with dialysate after dextran showed only a modest increase in CFC (2.3 times control).
    • Viscosity differences alone could not explain the observed reduction in CFC increase.

    Conclusions:

    • Dextran appears to be retained within the transcapillary space.
    • Dextran primarily reduces CFC by partially blocking transcapillary channels.
    • The mechanism involves physical obstruction rather than solely an increase in fluid viscosity.

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