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Iodine excess and hyperthyroidism.

E Roti1, E D Uberti

  • 1Università di Parma, Cattedra di Endocrinologia, Italy.

Thyroid : Official Journal of the American Thyroid Association
|June 9, 2001
PubMed
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Excess iodine intake can trigger hyperthyroidism, particularly in individuals with pre-existing thyroid conditions like goiter or Graves

Area of Science:

  • Endocrinology
  • Thyroidology

Background:

  • The thyroid gland requires 150 micrograms of iodine daily for hormone synthesis.
  • The thyroid possesses intrinsic mechanisms to maintain function amidst iodine excess.
  • Iodine is prevalent in medications, antiseptics, contrast media, and food preservatives.

Purpose of the Study:

  • To explore the mechanisms and patient populations susceptible to iodine-induced hyperthyroidism.
  • To differentiate between Type I and Type II amiodarone-induced thyrotoxicosis.

Main Methods:

  • Review of clinical observations and literature regarding iodine exposure and thyroid dysfunction.
  • Analysis of patient histories, including pre-existing thyroid conditions and medication use (e.g., amiodarone).

Main Results:

Related Experiment Videos

  • Iodine-induced hyperthyroidism is common in euthyroid individuals with iodine-deficient goiter upon sudden iodine exposure.
  • Autonomous thyroid function may facilitate excessive thyroid hormone synthesis.
  • Amiodarone can cause thyrotoxicosis through two mechanisms: excess iodine release (Type I) or direct thyroid follicle destruction (Type II).

Conclusions:

  • Patients with nodular goiter are prone to Type I amiodarone-induced thyrotoxicosis, while those with normal thyroid glands may develop Type II.
  • Type II thyrotoxicosis can lead to permanent hypothyroidism due to thyroid gland fibrosis.
  • Excess iodine can also exacerbate hyperthyroidism in Graves' disease patients and reduce antithyroid drug efficacy.