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[Amiodarone and the thyroid gland]

M Stäubli, P Bischof, C Wimpfheimer

    Schweizerische Medizinische Wochenschrift
    |October 24, 1981
    PubMed
    Summary
    This summary is machine-generated.

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    Amiodarone, an antiarrhythmic drug, can cause thyroid dysfunction in 5% of patients. It induces thyrotoxicosis or hypothyroidism and alters thyroid hormone metabolism, potentially causing local hypothyroidism in the heart.

    Area of Science:

    • Endocrinology
    • Pharmacology
    • Cardiology

    Context:

    • Amiodarone is a widely used antiarrhythmic medication.
    • Thyroid dysfunction is a known potential side effect of amiodarone therapy.
    • Understanding these effects is crucial for patient management.

    Purpose:

    • To review the multifaceted effects of amiodarone on thyroid function.
    • To classify the distinct categories of amiodarone-induced thyroid disorders.
    • To elucidate the impact of amiodarone on peripheral thyroid hormone metabolism.

    Summary:

    • Amiodarone contains a high iodine content, potentially causing iodine-induced thyrotoxicosis in susceptible individuals with nodular goiters.
    • It can also induce a Graves' disease-like thyrotoxicosis or hypothyroidism in rare cases, possibly due to genetic factors.

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  • The drug significantly alters thyroid hormone metabolism by inhibiting T4 to T3 conversion and increasing reverse T3.

    • Impact:

    • These thyroid-related side effects can complicate amiodarone treatment, necessitating careful monitoring.
    • The drug's interference with thyroid hormone metabolism may contribute to its cardiac effects, suggesting localized hypothyroidism.
    • This review highlights the complex interplay between amiodarone and thyroid physiology, impacting clinical practice.