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Thyroid function in chronic liver disease.

J R Green

    Zeitschrift Fur Gastroenterologie
    |July 1, 1979
    PubMed
    Summary
    This summary is machine-generated.

    Thyroid hormone levels are altered in liver cirrhosis, with reduced conversion of thyroxine (T4) to triiodothyronine (T3). This study investigates thyroid dysfunction in liver disease, impacting hormone regulation.

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    Area of Science:

    • Endocrinology
    • Hepatology
    • Thyroid Research

    Background:

    • Thyroxine (T4) is converted to the active triiodothyronine (T3) extrathyroidally, primarily in the liver.
    • Liver disease, specifically hepatic cirrhosis, is associated with significant thyroid hormone level alterations.

    Purpose of the Study:

    • To investigate the pathophysiology of thyroid hormone metabolism in patients with hepatic cirrhosis.
    • To understand the implications of altered T4 to T3 conversion in liver dysfunction.

    Main Methods:

    • Analysis of plasma concentrations of T4, T3, and thyrotropin (TSH).
    • Assessment of free hormone levels and kinetic studies to evaluate T4 to T3 conversion.
    • Evaluation of the thyrotropin-releasing hormone (TRH) response.

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    Main Results:

    • Patients with hepatic cirrhosis exhibit normal or elevated T4 and markedly reduced T3 levels.
    • Evidence suggests reduced extrathyroidal conversion of T4 to T3 in liver dysfunction.
    • Increased serum TSH and abnormal TSH response to TRH indicate disordered hypothalamic-pituitary control.

    Conclusions:

    • Thyroid physiology is significantly disturbed in hepatic cirrhosis.
    • Reduced T4 to T3 conversion is a key feature of thyroid dysfunction in liver disease.
    • Altered hypothalamic-pituitary function contributes to thyroid abnormalities in cirrhosis.