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Related Experiment Videos

Hypothyroid myopathy-pathological and ultrastructural study.

R T Lin1, C K Liu, C T Tai

  • 1Department of Neurology, Kaohsiung Medical University and Hospital, Taiwan.

The Kaohsiung Journal of Medical Sciences
|May 19, 2000
PubMed
Summary
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Thyroid hormone (T4) treatment improves hypothyroid myopathy, resolving glycogen accumulation in skeletal muscle. Muscle fiber changes indicate myopathy during treatment, while mitochondrial issues may persist.

Area of Science:

  • Endocrinology
  • Neurology
  • Muscle Physiology

Background:

  • Hypothyroid myopathy presents with muscle weakness and elevated creatine kinase (CK).
  • Thyroid hormone replacement therapy is the standard treatment.

Purpose of the Study:

  • To evaluate the clinical and ultrastructural changes in skeletal muscle of hypothyroid patients during thyroxine (T4) treatment.
  • To correlate muscle pathology with clinical severity and treatment response.

Main Methods:

  • Seventeen hypothyroid patients underwent clinical assessment using a modified rating scale.
  • Laboratory tests (thyroid function, CK) and electromyography were performed serially.
  • Muscle biopsies were analyzed before and after T4 treatment over an average follow-up of 1.8 years.

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Main Results:

  • Skeletal muscle fiber atrophy and increased central nuclear counts were observed during T4 treatment, correlating with clinical myopathy.
  • Abnormal glycogen accumulation significantly contributed to clinical severity and resolved with T4 therapy.
  • Mitochondrial abnormalities showed poor clinical correlation and may become permanent with prolonged hypothyroidism.

Conclusions:

  • Thyroxine therapy effectively ameliorates hypothyroid myopathy, primarily by resolving glycogen accumulation.
  • Skeletal muscle fiber changes and glycogen metabolism are key indicators of disease severity and treatment response.
  • Serial muscle biopsies are generally impractical for long-term monitoring but may be useful for refractory cases.