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[Hypothyroidism related to excess iodine]
1Clinique endocrinologique Marc Linquette CHRU de Lille USNA, 59037 Lille. jl-wemeau@chru-lille.fr
Presse Medicale (Paris, France : 1983)
|November 27, 2002
Summary
Excess iodine can temporarily reduce thyroid hormone production via the Wolff-Chaikoff effect. In some individuals, this effect persists, leading to iodine-induced hypothyroidism, particularly in those with pre-existing thyroid conditions.
Area of Science:
- Endocrinology
- Thyroid Physiology
Context:
- The Wolff-Chaikoff effect describes the thyroid gland's response to excess iodine, temporarily inhibiting hormone synthesis.
- This self-protective mechanism can lead to iodine-induced hypothyroidism in susceptible individuals, including fetuses, newborns, and adults.
Purpose:
- To elucidate the mechanisms and clinical implications of the Wolff-Chaikoff effect and iodine-induced hypothyroidism.
- To identify patient populations at risk for persistent thyroid dysfunction following excess iodine exposure.
Summary:
- Excess iodine triggers the Wolff-Chaikoff effect, reducing thyroid hormone production by inhibiting iodine organification.
- While typically transient due to an 'escape' phenomenon, prolonged inhibition can cause hypothyroidism, especially in individuals with autoimmune thyroiditis or prior thyroid disease.
- Clinical manifestations range from subclinical to overt hormone deficiency, usually resolving after iodine withdrawal, though hormone replacement may be needed.
Impact:
- Highlights the potential for iatrogenic thyroid dysfunction from iodine exposure.
- Informs clinical management strategies for patients at risk of iodine-induced hypothyroidism.
- Underscores the importance of monitoring thyroid function in individuals with specific risk factors following iodine administration.