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[Paradoxical effects of iodine overload on thyroid function]

B Bigorie, P Guillausseau, A Leger

    Annales De Medecine Interne
    |June 1, 1976
    PubMed
    Summary
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    Chronic iodine overload from medications or contrast media can cause goiters and hypothyroidism, especially in those with prior thyroid issues. Iodine is not recommended for endemic goiters due to risks of thyrotoxicosis.

    Area of Science:

    • Endocrinology
    • Pharmacology
    • Toxicology

    Background:

    • Iodine overload from long-term medication or contrast media use is a potential health concern.
    • Iodine deficiency is no longer considered the primary cause of endemic goiters in most regions.

    Observation:

    • Chronic iodine overload can lead to goiter formation, with or without hypothyroidism.
    • Patients with a history of thyroid disease are particularly susceptible to iodine-induced thyroid dysfunction.
    • Iodine administration is not indicated for endemic goiters due to the risk of iatrogenic thyrotoxicosis.

    Findings:

    • Long-term iodine exposure can precipitate thyroid complications, including goiter and hypothyroidism.
    • The use of iodine in medications should be re-evaluated when not essential, to prevent adverse effects.

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  • Iodine's role in endemic goiter treatment is outdated and potentially harmful.

    • Implications:

    • Reducing unnecessary iodine in medications could prevent iatrogenic thyroid complications.
    • Clinical practice should shift away from iodine for endemic goiter treatment.
    • Further research into iodine's long-term effects and safe usage levels is warranted.