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Hypothalamo-pituitary-thyroid axis function during cardiopulmonary bypass.

W F Bremner, K M Taylor, S Baird

    The Journal of Thoracic and Cardiovascular Surgery
    |March 1, 1978
    PubMed
    Summary
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    Cardiopulmonary bypass surgery alters thyroid hormones, increasing free thyroxine and decreasing free triiodothyronine. This impacts thyroid-stimulating hormone release, suggesting a direct inhibitory effect on the hypothalamo-pituitary axis.

    Area of Science:

    • Endocrinology
    • Cardiovascular Surgery
    • Physiology

    Background:

    • Cardiopulmonary bypass (CPB) is a critical procedure in cardiac surgery.
    • Thyroid hormones play a vital role in regulating metabolism and physiological functions.
    • Alterations in thyroid hormone levels during CPB are not fully understood.

    Purpose of the Study:

    • To investigate the changes in circulating thyroid hormone levels during CPB.
    • To assess the hypothalamo-pituitary response to thyrotropin-releasing hormone (TRH) during CPB.
    • To explore the potential mechanisms behind these hormonal alterations.

    Main Methods:

    • Blood samples were collected from patients undergoing CPB.
    • Levels of free thyroxine (fT4) and free triiodothyronine (fT3) were measured.

    Related Experiment Videos

  • Thyrotropin-releasing hormone (TRH) stimulation tests were performed during CPB.

    • Main Results:

    • A significant increase in free thyroxine (fT4) levels was observed.
    • A significant decrease in free triiodothyronine (fT3) levels was noted.
    • The response to TRH stimulation was blunted during CPB.

    Conclusions:

    • CPB surgery induces marked alterations in thyroid hormone profiles.
    • The blunted TRH response suggests a potential direct inhibitory effect of CPB on the hypothalamo-pituitary axis.
    • These hormonal changes may have significant physiological implications that warrant further investigation.