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Respiratory muscle dysfunction in systemic lupus erythematosus.

J Martens, M Demedts, M T Vanmeenen

    Chest
    |August 1, 1983
    PubMed
    Summary

    Systemic lupus erythematosus (SLE) can cause respiratory muscle weakness, leading to restrictive lung defects. This study found reduced lung function in SLE patients due to impaired breathing muscles.

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    Area of Science:

    • Pulmonary Medicine
    • Rheumatology
    • Muscle Physiology

    Background:

    • Systemic lupus erythematosus (SLE) is a chronic autoimmune disease with diverse clinical manifestations.
    • Respiratory complications in SLE can significantly impact patient morbidity and mortality.
    • The specific mechanisms underlying pulmonary dysfunction in SLE require further elucidation.

    Purpose of the Study:

    • To investigate the pulmonary mechanics and respiratory muscle function in patients with SLE.
    • To determine the prevalence and characteristics of restrictive ventilatory defects in SLE patients.
    • To explore the potential link between SLE and subclinical respiratory muscle disorders.

    Main Methods:

    • Assessment of pulmonary mechanics, including vital capacity and lung compliance.
    • Measurement of maximal inspiratory and expiratory pressures (transdiaphragmatic, esophageal, gastric).
    • Evaluation of 26 consecutive patients with SLE, aged 33 to 62 years.

    Main Results:

    • Seven out of 26 SLE patients exhibited a restrictive ventilatory defect (vital capacity: 47% predicted).
    • Reduced inspiratory and expiratory muscle strength was identified as the cause, linked to abnormal esophageal and gastric pressures.
    • Reduced static expiratory lung compliance was observed in all patients, with partial normalization after passive lung inflation.
    • These respiratory muscle abnormalities were not associated with corticosteroid use or inanition and were not progressive.

    Conclusions:

    • Weakness of inspiratory and expiratory muscles is a significant cause of restrictive ventilatory defects in SLE patients.
    • The observed respiratory muscle dysfunction may represent a generalized, subclinical myopathy associated with SLE.
    • Pulmonary function abnormalities in SLE are not necessarily progressive and may not be directly related to corticosteroid treatment.

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