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Platysmal myoclonus in subclinical hyperthyroidism.

Hock-Luen Teoh1, Erle Chuen-Hian Lim

  • 1Division of Neurology, National University Hospital, Singapore.

Movement Disorders : Official Journal of the Movement Disorder Society
|June 2, 2005
PubMed
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This case study highlights an unusual presentation of myoclonus in a young woman linked to subclinical hyperthyroidism. Treatment of the thyroid condition and medication effectively resolved the movement disorder.

Area of Science:

  • Neurology
  • Endocrinology

Background:

  • Hyperthyroidism is known to cause various movement disorders.
  • Movement disorders associated with hyperthyroidism typically include chorea and tremors.

Observation:

  • A young Chinese woman presented with unusual myoclonus affecting platysmal muscles.
  • This myoclonus was associated with subclinical hyperthyroidism and preceded by typical hyperthyroid symptoms.

Findings:

  • The patient's symptoms included weight loss, menstrual irregularities, and heat intolerance.
  • Myoclonus improved with clonazepam treatment.
  • Hyperthyroidism was managed with carbimazole, leading to resolution of symptoms.

Implications:

  • This case expands the spectrum of movement disorders associated with hyperthyroidism.

Related Experiment Videos

  • It underscores the importance of considering endocrine disorders in patients with unexplained myoclonus.
  • Prompt diagnosis and treatment of hyperthyroidism are crucial for managing associated neurological symptoms.