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Related Experiment Videos

Blood replacement in dogs by dextran-hemoglobin

S C Tam, J Blumenstein, J T Wong

    Canadian Journal of Biochemistry
    |October 1, 1978
    PubMed
    Summary

    Exchange transfusions using dextran-hemoglobin complexes in dogs significantly improved survival rates compared to dextran alone. This innovative blood substitute allowed survival at critically low hematocrit levels, demonstrating its therapeutic potential.

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    Area of Science:

    • Biomedical Engineering
    • Veterinary Medicine
    • Hematology

    Background:

    • Exchange transfusions are critical in managing severe anemia or certain toxicities.
    • Traditional dextran solutions have limitations in supporting oxygen-carrying capacity during extensive blood volume replacement.
    • The need for effective oxygen carriers during exchange transfusions is paramount for patient survival.

    Purpose of the Study:

    • To evaluate the efficacy and safety of a novel dextran-hemoglobin complex as a blood substitute in canine exchange transfusion models.
    • To compare the survival outcomes of dogs receiving dextran-hemoglobin complex versus dextran alone during severe hemodilution.

    Main Methods:

    • Exchange transfusions were performed on dogs using either dextran or a dextran-hemoglobin complex.
    • Hematocrit levels were progressively reduced to assess survival thresholds.
    • Circulating half-life of the dextran-hemoglobin complex and erythropoiesis rates were monitored.

    Main Results:

    • Dogs transfused with dextran alone did not survive hematocrit reductions to 6-10%.
    • Dogs receiving the dextran-hemoglobin complex survived hematocrit levels of 2% or lower.
    • The functional dextran-hemoglobin complex had a circulating half-life of 1.9 days, with compensatory erythropoiesis observed.

    Conclusions:

    • Dextran-hemoglobin complex is a superior blood substitute compared to dextran alone for exchange transfusions in dogs.
    • This complex effectively supports oxygen transport and survival during severe hemodilution, enabling complete recovery.
    • The findings support the potential of hemoglobin-based oxygen carriers in critical care veterinary medicine.

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