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Glomerulonephritis associated with polymyositis.

R F Dyck, A Katz, D A Gordon

    The Journal of Rheumatology
    |May 1, 1979
    PubMed
    Summary
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    Primary idiopathic polymyositis can cause kidney problems like proteinuria. Treatment of polymyositis with corticosteroids resolved these kidney issues, suggesting a link between the conditions.

    Area of Science:

    • Nephrology
    • Rheumatology
    • Immunology

    Background:

    • Primary idiopathic polymyositis is an autoimmune disease affecting muscles.
    • Renal involvement can occur in autoimmune conditions, but specific patterns require elucidation.

    Purpose of the Study:

    • To investigate the association between polymyositis and renal abnormalities.
    • To characterize the renal pathology and response to treatment in affected patients.

    Main Methods:

    • Case series of five patients with polymyositis and renal symptoms.
    • Renal biopsy analysis to identify pathological changes.
    • Clinical monitoring of proteinuria, urine sediment, and muscle disease during corticosteroid therapy.

    Main Results:

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    • All five patients presented with proteinuria and abnormal urine sediment.
    • Renal biopsies revealed focal mesangial proliferative glomerulonephritis with immunoglobulin and complement deposition.
    • Corticosteroid treatment led to resolution of renal abnormalities and muscle disease improvement within 4-8 weeks.

    Conclusions:

    • Focal mesangial proliferative glomerulonephritis is a potential renal manifestation of polymyositis.
    • Immune complexes may play a role in the pathogenesis of this renal lesion.
    • Treatment of the underlying polymyositis effectively manages the associated kidney disease.