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Thyroid function after bronchography with propyliodone.

G Benker, A Vosskühler, H G Hoff

    Hormone Research
    |January 1, 1983
    PubMed
    Summary
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    Propyliodone used in bronchography significantly impacts thyroid function, causing iodine absorption and transient hormone changes. Caution is advised for patients with autonomous thyroid tissue to prevent potential hyperthyroidism.

    Area of Science:

    • Endocrinology
    • Radiology
    • Pulmonology

    Background:

    • Bronchography is an imaging technique used to visualize the bronchial tree.
    • Iodine-containing contrast agents can potentially affect thyroid function.
    • Understanding the impact of propyliodone on thyroid hormones is crucial for patient safety.

    Purpose of the Study:

    • To investigate the effects of propyliodone during bronchography on thyroid function.
    • To assess the absorption and elimination of propyliodone from the bronchial tree.
    • To identify potential risks and clinical implications for thyroid hormone levels.

    Main Methods:

    • Studied thyroid function in 27 subjects undergoing bronchography with propyliodone.
    • Monitored serum non-hormonal iodine levels, thyroxine-binding globulin, and thyroid hormones (T3, rT3, FT4).

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  • Assessed response to thyrotropin-releasing hormone in a subset of patients.

    • Main Results:

    • Sustained elevations in serum non-hormonal iodine indicated significant propyliodone absorption and slow elimination.
    • Transient increases in thyroxine-binding globulin and thyroid hormones occurred during anesthesia.
    • Inhibition of T4-T3 conversion was observed, with T3 nadir and rT3 peak on day 2 post-exposure.
    • Some patients showed transiently abnormal T4, T3, or thyrotropin-releasing hormone responses, mimicking hyperthyroidism.
    • No clinical thyrotoxicosis was observed in the study group.

    Conclusions:

    • Propyliodone is absorbed from the bronchial tree, leading to prolonged elevated non-hormonal iodine levels.
    • Transient thyroid hormone alterations and potential misinterpretation as hyperthyroidism can occur.
    • Patients with autonomous thyroid tissue should exercise caution with propyliodone due to the risk of iodine-induced hyperthyroidism.