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Published in: BMC Nephrology 1/2016

Open Access 01-12-2016 | Research article

Long-term outcomes in antineutrophil cytoplasmic autoantibody–positive eosinophilic granulomatosis with polyangiitis patients with renal involvement: a retrospective study of 14 Chinese patients

Authors: Yinghua Chen, Yuemei Ding, Zhengzhao Liu, Haitao Zhang, Zhihong Liu, Weixin Hu

Published in: BMC Nephrology | Issue 1/2016

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Abstract

Background

The clinic-pathological features and outcomes of Chinese patients with antineutrophil cytoplasmic autoantibody (ANCA)-positive eosinophilic granulomatosis with polyangiitis (EGPA) and renal involvement have not been studied.

Methods

Fourteen EGPA patients with renal involvement were included. All patients underwent renal biopsy. Clinic-pathological features and outcomes were retrospectively analyzed.

Results

The most common initial symptom of EGPA was asthma (57.1 %), followed by hemoptysis (21.4 %), gross hematuria (14.3 %), and arthritis (7.1 %). All patients had positive serum ANCA (anti-MPO in 12, anti-PR3 in 2). Elevated eosinophils (median 15 %, range 10–45 %) were found in all patients. The median serum IgE level was 463 g/L (range 200–1000 g/L). All patients presented with renal dysfunction, with a median SCr of 5.4 mg/dL (range 1.47–11 mg/dL), seven patients (50 %) required initial renal replacement therapy. Thirteen patients showed hematuria and proteinuria (median 1.1 g/24 h, range 0.5–7.8 g/24 h). Renal biopsy showed pauci-immune segmental necrotizing glomerulonephritis with crescents in 13 patients and acute interstitial nephritis in one patient. Twelve patients (85.7 %) showed renal interstitial eosinophil infiltration, among whom three had eosinophilic granuloma. Among seven patients (71.4 %) who required initial dialysis, 5 discontinued dialysis, one died, one received maintenance dialysis after glucocorticoids plus immunosuppressive for induction treatment. Twelve patients were followed up for a median of 43.5 months (range 6–83 months), during follow-up, two patients progressed to end-stage renal disease, nine had chronic kidney disease with eGFR < 60 mL/min, and two patients had normal eGFR.

Conclusions

Renal involvement in ANCA-positive EGPA could be severe and showed varied renal histology. Although intensive immunosuppressive therapy effectively improved the renal function, the long-term renal survival was poor. Early diagnosis and treatment are essential to improve long-term renal survival.
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Metadata
Title
Long-term outcomes in antineutrophil cytoplasmic autoantibody–positive eosinophilic granulomatosis with polyangiitis patients with renal involvement: a retrospective study of 14 Chinese patients
Authors
Yinghua Chen
Yuemei Ding
Zhengzhao Liu
Haitao Zhang
Zhihong Liu
Weixin Hu
Publication date
01-12-2016
Publisher
BioMed Central
Published in
BMC Nephrology / Issue 1/2016
Electronic ISSN: 1471-2369
DOI
https://doi.org/10.1186/s12882-016-0319-2

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