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Reversible respiratory muscle weakness in hyperthyroidism.

A Mier1, C Brophy, J A Wass

  • 1Department of Respiratory Muscle Physiology, Brompton Hospital, London, United Kingdom.

The American Review of Respiratory Disease
|February 1, 1989
PubMed
Summary
This summary is machine-generated.

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Thyroid disease can cause respiratory muscle weakness, affecting breathing and potentially leading to respiratory failure. Fortunately, this muscle weakness is reversible with medical treatment for hyperthyroidism.

Area of Science:

  • Endocrinology
  • Pulmonology
  • Neuromuscular Disorders

Background:

  • Breathlessness is a common symptom in hyperthyroidism.
  • Respiratory failure, though rare, can occur in thyrotoxicosis.
  • Proximal myopathy is recognized, but respiratory muscle function in thyrotoxicosis is not well-studied.

Purpose of the Study:

  • To assess quadriceps femoris and respiratory muscle strength in thyrotoxic patients.
  • To evaluate the reversibility of respiratory muscle weakness after medical treatment.

Main Methods:

  • Assessed quadriceps femoris muscle strength.
  • Measured vital capacity and global respiratory muscle strength.
  • Evaluated diaphragmatic function using transdiaphragmatic pressures (sniff and twitch).

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Main Results:

  • Prior to treatment, patients showed reduced quadriceps strength, vital capacity, and global respiratory muscle strength.
  • Diaphragmatic weakness was noted in one patient.
  • Significant improvements in muscle strength and lung function were observed after medical treatment.

Conclusions:

  • Respiratory muscle weakness is a feature of hyperthyroidism.
  • This weakness is reversible with effective medical management.
  • Clinicians should consider respiratory muscle involvement in thyrotoxic patients presenting with breathlessness.