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Acute changes in thyroid function in patients treated with radioactive iodine.

R B Shafer, F Q Nuttall

    Lancet (London, England)
    |October 4, 1975
    PubMed
    Summary
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    Radioiodine treatment for hyperthyroidism causes a rapid increase in thyroid hormones triiodothyronine (T3) and thyroxine (T4) within 48 hours. This surge may precipitate acute thyroid crisis in some patients.

    Area of Science:

    • Endocrinology
    • Nuclear Medicine

    Background:

    • Hyperthyroidism is a common endocrine disorder characterized by excessive thyroid hormone production.
    • Radioiodine-131 (I-131) is a standard treatment for hyperthyroidism, but its effects on thyroid hormone levels require detailed investigation.

    Purpose of the Study:

    • To investigate the dynamic changes in serum triiodothyronine (T3) and thyroxine (T4) levels following iodine-131 treatment in hyperthyroid patients.
    • To explore the potential correlation between post-treatment hormone fluctuations and the occurrence of acute thyroid crisis.

    Main Methods:

    • Serum samples were collected from thirteen hyperthyroid patients before and at regular intervals after iodine-131 administration.
    • Concentrations of triiodothyronine (T3) and thyroxine (T4) were quantified using established laboratory assays.

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    Main Results:

    • A significant and rapid increase in serum T3 was observed, peaking at 24 hours post-treatment (mean 365 ng/100 ml from a pretreatment mean of 250 ng/100 ml).
    • Serum T4 levels also demonstrated a rise, reaching a maximum between 24-48 hours (mean 22.3 mug/100 ml from a pretreatment mean of 18.7 mug/100 ml).

    Conclusions:

    • The acute elevation of T3 and T4 following iodine-131 therapy is a notable finding.
    • These transient hyperthyroid hormone surges may be a contributing factor to the development of acute thyroid crisis in susceptible individuals post-treatment.