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[Factitious hyperthyroidism caused by L-thyroxin abuse. Case report].

G Galvan

    Acta Medica Austriaca
    |January 1, 1983
    PubMed
    Summary
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    This case study highlights thyrotoxicosis factitia, a condition caused by excessive thyroid hormone intake. Differentiating it from endogenous hyperthyroidism is crucial, especially with psychological factors present.

    Area of Science:

    • Endocrinology
    • Internal Medicine
    • Psychiatry

    Background:

    • Hyperthyroidism management can be challenging.
    • Antithyroid drug therapy is a common treatment approach.

    Observation:

    • A patient presented with worsening hyperthyroidism despite antithyroid treatment.
    • The cause was self-administered high-dose levothyroxine (lT4) due to personal issues.
    • This led to a diagnostic challenge between factitious thyrotoxicosis and endogenous hyperthyroidism.

    Findings:

    • Thyroid hormone abuse should be suspected in cases of suspected psychopathy or when thyroid medication is used for suppression or prophylaxis.
    • Overweight, personality disorders, and resistance to antithyroid drugs suggest thyroid hormone abuse.
    • Key diagnostic indicators include absent thyroid radioiodine/technetium uptake and suppressed thyroglobulin levels.

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    Implications:

    • Accurate diagnosis of thyrotoxicosis factitia is essential for appropriate patient management.
    • Considering psychological factors and medication history aids in differential diagnosis.
    • Specific laboratory findings are critical for distinguishing between exogenous and endogenous hyperthyroid states.