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Chorea associated with thyroxine replacement therapy.

Jeremy D Isaacs1, James Rakshi, Richard Baker

  • 1Department of Medicine, Hammersmith Hospital, London, UK. j.isaacs@prion.ucl.ac.uk

Movement Disorders : Official Journal of the Movement Disorder Society
|August 4, 2005
PubMed
Summary
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This study details the first case of generalized chorea caused by iatrogenic thyrotoxicosis. Researchers suggest thyroxine directly impacts the basal ganglia, causing this movement disorder.

Area of Science:

  • Neurology
  • Endocrinology

Background:

  • Hyperthyroidism is a condition of excess thyroid hormone.
  • Chorea is a neurological movement disorder characterized by involuntary, irregular, and purposeless movements.

Observation:

  • This report describes the first instance of generalized chorea linked to iatrogenic thyrotoxicosis (thyroid hormone excess caused by medical treatment).

Findings:

  • The movement disorder, chorea, is proposed to result from a direct neurotoxic effect of excess thyroxine on the basal ganglia.
  • This contrasts with autoimmune explanations for similar neurological manifestations in thyroid disorders.

Implications:

  • This finding expands the understanding of hyperthyroidism's neurological complications.
  • It suggests a direct mechanism for thyroxine-induced movement disorders, potentially impacting treatment strategies for thyrotoxicosis.

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