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| AuthorsJohn H Stone, MD, MPHRonald J Falk, MD | Section EditorsRichard J Glassock, MD, MACPGerald B Appel, MD | Deputy EditorAlice M Sheridan, MD |
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Wegener's granulomatosis (WG) and microscopic polyangiitis (MPA) are related systemic vasculitides. Both are associated with antineutrophil cytoplasmic antibodies (ANCA), have similar features on renal histology (eg, a focal necrotizing, pauci-immune glomerulonephritis), and have similar outcomes. There are, however, several differences between these disorders. (See "Clinical manifestations and diagnosis of Wegener's granulomatosis and microscopic polyangiitis", section on 'MPA versus WG'.)
Approximately 85 to 90 percent of patients with WG or MPA attain clinical remission with initial immunosuppressive therapy (typically cyclophosphamide and glucocorticoids). They are then treated with maintenance immunosuppressive therapy with azathioprine or methotrexate, usually for a period of 12 to 18 months. However, relapses are common and some patients have frequent relapses. In addition, among patients who progress to end-stage renal disease, nonrenal relapses can occur in patients treated with maintenance hemodialysis or renal transplantation, and renal manifestations can recur in the transplanted kidney.
Issues related to relapsing disease in patients with WG or MPA will be reviewed here. This includes patients who have progressed to end-stage renal disease and are on chronic renal replacement therapy.
Initial immunosuppressive therapy, the treatment of cyclophosphamide resistant disease, maintenance immunosuppressive therapy, clinical manifestations and diagnosis, and patient and renal outcomes are discussed elsewhere. (See "Initial immunosuppressive therapy in Wegener's granulomatosis and microscopic polyangiitis" and "Treatment of cyclophosphamide-resistant Wegener's granulomatosis and microscopic polyangiitis" and "Maintenance immunosuppressive therapy in Wegener's granulomatosis and microscopic polyangiitis" and "Clinical manifestations and diagnosis of Wegener's granulomatosis and microscopic polyangiitis" and "Patient and renal outcomes in Wegener's granulomatosis and microscopic polyangiitis".)
Relapse is defined as the recurrence of signs or symptoms of active vasculitis in any organ system [1,2]. Relapse can be manifested by one or more of the following features:
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