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Amiodarone therapy effects on childhood thyroid function.

D C Costigan, F J Holland, D Daneman

    Pediatrics
    |May 1, 1986
    PubMed
    Summary
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    Amiodarone treatment in children can disrupt thyroid function, potentially causing hypothyroidism or hyperthyroxinemia. Regular thyroid screening is crucial for early detection and management of these amiodarone-induced thyroid issues.

    Area of Science:

    • Pediatric Endocrinology
    • Cardiology
    • Pharmacology

    Background:

    • Amiodarone, an antiarrhythmic drug, contains high iodine content and inhibits 5'-monodeiodinase, impacting thyroid hormone metabolism.
    • Understanding amiodarone's effects on the pediatric thyroid axis is essential due to its critical role in development.

    Observation:

    • Thyroid function was monitored in 15 children treated with amiodarone.
    • Changes in thyroid hormones and thyroid-stimulating hormone were systematically assessed before and during treatment.

    Findings:

    • Three children developed hypothyroidism, with two requiring L-thyroxine treatment.
    • One child exhibited persistent hyperthyroxinemia without clinical hyperthyroidism.
    • Euthyroid children showed increased serum T4, rT3, and TSH, indicating compensatory pituitary-thyroid axis adjustments.

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    Implications:

    • Amiodarone can cause significant thyroid dysfunction in children, necessitating careful monitoring.
    • Routine thyroid function screening is vital for early identification of hypothyroidism in pediatric patients on amiodarone.
    • Compensatory mechanisms in the pituitary-thyroid axis may mask underlying issues, highlighting the need for vigilant assessment.