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Thyrotoxicosis and dyspnoea

J Ayres, J Rees, T J Clark

    Clinical Endocrinology
    |January 1, 1982
    PubMed
    Summary
    This summary is machine-generated.

    Thyrotoxicosis can cause shortness of breath due to reversible respiratory muscle weakness. Treatment improved breathing in patients with thyrotoxicosis and proximal myopathy, confirming this link.

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    Area of Science:

    • Endocrinology
    • Pulmonology
    • Neuromuscular Disorders

    Background:

    • Shortness of breath is a frequent symptom in thyrotoxicosis.
    • Potential causes include respiratory muscle dysfunction.
    • Exclusion of heart failure is crucial for diagnosis.

    Purpose of the Study:

    • To investigate dyspnea and respiratory muscle strength in thyrotoxicosis patients without heart failure.
    • To determine if respiratory muscle weakness is reversible with treatment.

    Main Methods:

    • Studied 11 patients with thyrotoxicosis.
    • Assessed dyspnea, skeletal muscle power, and respiratory muscle power (maximal inspiratory pressure).
    • Evaluated changes after treatment for thyrotoxicosis.

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    Main Results:

    • Four patients (36.4%) showed significant improvement in maximal inspiratory pressure post-treatment.
    • These four patients presented with breathlessness and proximal myopathy before treatment.
    • Respiratory muscle function improved with thyrotoxicosis management.

    Conclusions:

    • Thyrotoxicosis can cause a reversible respiratory muscle myopathy.
    • This myopathy contributes to exertional breathlessness in affected patients.
    • Treatment of thyrotoxicosis can restore respiratory muscle function.