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Related Experiment Videos

Optimal hematocrit value in critically ill postoperative patients.

L S Czer, W C Shoemaker

    Surgery, Gynecology & Obstetrics
    |September 1, 1978
    PubMed
    Summary
    This summary is machine-generated.

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    Optimal hematocrit levels for critically ill patients are between 27-33%, with 32% being ideal when blood volume is unknown. Transfusions are beneficial below 32%, while crystalloids/colloids are preferred above this level.

    Area of Science:

    • Critical Care Medicine
    • Transfusion Medicine
    • Physiology

    Background:

    • Traditionally, falling hematocrit indicates active bleeding.
    • Post-volume replacement, normovolemic hemodilution may be beneficial.
    • Normal hematocrit is not always the goal of transfusion therapy.

    Purpose of the Study:

    • To empirically define the optimal hematocrit value in critically ill postoperative patients.
    • To correlate hematocrit levels with mortality and cardiorespiratory variables.
    • To guide transfusion and fluid therapy decisions based on hematocrit.

    Main Methods:

    • Analysis of mortality rates in 94 critically ill postoperative patients.
    • Examination of mortality in relation to hematocrit and cardiorespiratory variables.

    Related Experiment Videos

  • Assessment of oxygen availability and consumption post-transfusion at varying hematocrit levels.

    • Main Results:

    • Lowest mortality rates observed with hematocrit values between 27% and 33%.
    • Increased mortality occurred when hematocrit values dropped below 32% alongside reduced cardiorespiratory function.
    • Oxygen transport improved significantly with transfusions when hematocrit was below 32% but not above 33%.

    Conclusions:

    • An optimal hematocrit of 32% is recommended when precise blood volume is unmeasurable.
    • For indicated volume therapy, transfuse blood if hematocrit is <32%.
    • Utilize crystalloids or colloids if hematocrit is >32%.