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Related Experiment Videos

Transient TRH deficiency after prolonged thyroid hormone therapy.

P A Singer, J T Nicoloff, R B Stein

    The Journal of Clinical Endocrinology and Metabolism
    |September 1, 1978
    PubMed
    Summary

    Long-term thyroid hormone therapy can lead to secondary hypothyroidism upon withdrawal. This study suggests a link between high-dose thyroid hormone use and impaired thyrotropin-releasing hormone (TRH) reserve.

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    Area of Science:

    • Endocrinology
    • Hormone Therapy Research

    Background:

    • Thyroid hormone replacement therapy is common for hypothyroidism.
    • The effects of prolonged high-dose thyroid hormone administration on the hypothalamic-pituitary-thyroid axis are not fully understood.

    Observation:

    • A patient on long-term high-dose thyroid hormone therapy developed secondary hypothyroidism after withdrawal, characterized by low T4/T3 and blunted TSH response to TRH.
    • Pituitary hormone evaluation, including prolactin, was otherwise normal.

    Findings:

    • Following thyroid hormone withdrawal, the patient exhibited features of secondary hypothyroidism with impaired TSH response to TRH.
    • Recovery of pituitary TSH reserve was observed over 3 months, with an exaggerated TSH response to exogenous TRH.
    • Indirect assessment suggested impaired endogenous TRH reserve capacity, which showed gradual improvement over 28 months.

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  • Full recovery of thyroid hormone levels and normal TSH response to TRH occurred by 28 months.

    • Implications:

    • High-dose thyroid hormone therapy may reversibly impair endogenous thyrotropin-releasing hormone (TRH) reserve.
    • This suggests a potential mechanism for prolonged pituitary dysfunction after supraphysiological thyroid hormone exposure.
    • Further research is warranted to elucidate the precise relationship between thyroid hormone dosage and TRH reserve.