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Related Experiment Videos

Preclinical hyperthyroidism--a graded condition.

E Gemsenjäger, J Girard

    Acta Endocrinologica
    |April 1, 1983
    PubMed
    Summary

    Preclinical hyperthyroidism in multinodular goitre patients shows variable TSH suppression and thyroid hormone levels. Despite suppressed TSH, a T3 increase after TRH suggests residual TSH secretion and fluctuating thyroid hormone supply.

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    Area of Science:

    • Endocrinology
    • Thyroidology
    • Internal Medicine

    Background:

    • Multinodular goitre (MNG) can present with preclinical hyperthyroidism, characterized by suppressed TSH despite normal thyroid hormone levels.
    • Assessing thyroid function in MNG requires understanding the nuances of TSH response to TRH stimulation.

    Purpose of the Study:

    • To investigate the characteristics of thyroid hormone levels and TSH response to TRH in patients with MNG and preclinical hyperthyroidism.
    • To explore the relationship between TSH suppression, thyroid hormone fluctuations, and T3 response to TRH stimulation in MNG.

    Main Methods:

    • Analysis of FT4-index (FT4-I) and FT3-index (FT3-I) in 65 surgical patients with MNG and preclinical hyperthyroidism.
    • Repeated pre-operative TRH tests were performed on 35 patients to assess TSH responsiveness.
    • Categorization of patients based on TRH test results (unresponsive/responsive) and thyroid hormone levels.

    Main Results:

    • FT4-I and FT3-I values in preclinical hyperthyroid MNG patients ranged from low to high normal, not significantly different from controls.
    • A significant T3 increase was observed after oral TRH in MNG patients with preclinical hyperthyroidism, indicating residual TSH secretion.
    • TSH suppression degree correlated with fluctuating thyroid hormone supply, and T3 response depended on TSH suppression and thyroidal reserve.

    Conclusions:

    • Preclinical hyperthyroidism in MNG involves variable TSH suppression and fluctuating thyroid hormone levels.
    • Despite TRH-resistant TSH suppression, some TSH is secreted, influencing thyroid hormone dynamics.
    • Thyroidal reserve and TSH suppression degree are critical factors in the T3 response to TRH in MNG patients.

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