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Related Experiment Videos

Blood viscosity and the overnight fast

H B Aronson, T Horne, S H Blondheim

    Canadian Anaesthetists' Society Journal
    |November 1, 1980
    PubMed
    Summary

    A 12-hour preoperative fast does not significantly alter blood viscosity. Prolonged fasting requires intravenous fluids to prevent adverse rheological effects and maintain organ perfusion.

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    Area of Science:

    • Physiology
    • Hematology

    Background:

    • Fasting is common before surgery.
    • Extended fasting can alter blood properties.

    Purpose of the Study:

    • To investigate the rheological effects of a 12-hour overnight fast.
    • To determine if the standard preoperative fast impacts blood viscosity.

    Main Methods:

    • 17 healthy subjects underwent a 12-hour overnight fast.
    • Blood viscosity was measured before and after the fasting period.

    Main Results:

    • A 12-hour fast did not significantly increase blood viscosity.
    • This contrasts with findings after a 24-hour fast, which does increase viscosity.

    Conclusions:

    • The standard 12-hour preoperative fast appears safe regarding blood rheology.
    • Intravenous fluids are recommended for prolonged fasting to prevent adverse viscosity changes and maintain organ perfusion.

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