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Related Experiment Videos

Effect of erythrocyte storage and oxyhemoglobin affinity changes on cardiac function.

C S Apstein, R C Dennis, L Briggs

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

    Stored red blood cells with low oxygen-carrying capacity reduce heart function. Restoring oxygen release from these cells improves myocardial performance, especially in patients with limited blood flow.

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    Perfusion·2007

    Area of Science:

    • Cardiovascular Physiology
    • Blood Transfusion Medicine
    • Red Blood Cell Metabolism

    Background:

    • Blood storage reduces erythrocyte 2,3-diphosphoglycerate (DPG) levels.
    • This decrease increases hemoglobin's oxygen affinity, potentially impairing oxygen delivery to tissues.
    • Impaired oxygen transport can negatively affect myocardial function, particularly under stress.

    Purpose of the Study:

    • To investigate the impact of varying oxyhemoglobin affinity (OHA) on myocardial function and metabolism.
    • To compare the effects of high OHA (standard storage) versus low OHA (restored DPG) erythrocytes on isolated rabbit hearts.
    • To assess myocardial response under basal and stress conditions at different temperatures.

    Main Methods:

    • Isolated rabbit hearts were perfused at fixed coronary flow.

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  • Myocardial function and metabolism were measured under basal and isoproterenol-induced stress.
  • Hearts were perfused with either high OHA erythrocytes (standard storage) or low OHA erythrocytes (biochemically treated to restore DPG and P50).
  • Experiments were conducted at 37°C and 30°C.

    • Main Results:

    • Low OHA erythrocytes released more oxygen compared to high OHA erythrocytes.
    • Myocardial oxygen consumption was significantly increased with low OHA cells.
    • Contractile function of the heart was enhanced in the presence of low OHA erythrocytes under both basal and stress conditions.
    • These improvements were observed at both experimental temperatures.

    Conclusions:

    • Erythrocytes with restored 2,3-DPG levels (low OHA) enhance myocardial oxygen release and function.
    • The findings suggest that blood storage conditions affecting OHA can impact cardiac performance.
    • These results may have clinical implications for patients receiving blood transfusions, especially those with compromised coronary flow.