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Related Experiment Videos

Thyroid function and circulating antithyroid antibodies in myasthenia gravis.

W R Kiessling, K W Pflughaupt, K Ricker

    Neurology
    |June 1, 1981
    PubMed
    Summary

    This study assessed thyroid function in myasthenia gravis patients, finding significant rates of hyperthyroidism and hypothyroidism. Euthyroid patients with thyroid antibodies showed an elevated TSH response, indicating a potential risk for future hypothyroidism.

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    Area of Science:

    • Endocrinology
    • Neurology
    • Immunology

    Background:

    • Myasthenia gravis (MG) is an autoimmune disorder affecting neuromuscular junctions.
    • Thyroid dysfunction is frequently observed in patients with autoimmune diseases.
    • The relationship between MG and thyroid autoimmunity warrants further investigation.

    Purpose of the Study:

    • To evaluate thyroid function in a cohort of myasthenia gravis patients.
    • To determine the prevalence of thyrotoxicosis, hypothyroidism, and subclinical thyroid disorders in MG patients.
    • To investigate the association between thyroid autoimmunity and thyroid function in euthyroid MG patients.

    Main Methods:

    • Radioimmunoassays were used to measure thyroid hormones (T3, T4) and binding globulin (TBG), along with thyroid-stimulating hormone (TSH).

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  • The TRH-stimulation test was performed in a subset of patients to assess thyroid reserve.
  • Hemagglutination tests were employed to detect antithyroglobulin antibodies (Tab) and antimicrosomal antibodies (Mab).

    • Main Results:

    • Thyrotoxicosis was detected in 5.7% of patients, and preclinical hyperthyroidism in approximately 10%.
    • Hypothyroidism was found in 1.9%, and preclinical hypothyroidism in 3.4% of patients.
    • Eighty-four percent of patients were euthyroid, but 27% of these had positive antithyroid antibodies (7 Tab-positive, 20 Mab-positive).
    • Euthyroid antibody-positive patients exhibited a significantly higher TSH response to TRH stimulation.

    Conclusions:

    • A notable proportion of myasthenia gravis patients exhibit thyroid dysfunction, including overt and subclinical forms.
    • The presence of antithyroid antibodies in euthyroid MG patients is associated with an altered TSH response to TRH.
    • Euthyroid myasthenia gravis patients with thyroid antibodies may be at increased risk for developing hypothyroidism.