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Clinicopathological characteristics of patients with immunoglobulin A nephropathy showing acute exacerbations after favorable long-term clinical courses

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Abstract

Background

Sometimes, acute and progressive proteinuria increases occur in patients with IgA nephropathy (IgAN) after favorable long-term clinical courses of >10 years, but their clinical and histological characteristics are not well understood.

Methods

We retrospectively selected 20 IgAN patients who had been followed for >10 years after their initial biopsies (1stBx) and underwent second biopsies (2ndBx), because their proteinuria increased to >1 g/day. Eight patients with acute exacerbations (Group A) showed acute proteinuria increases after long periods of mild proteinuria. Their clinicopathological characteristics were analyzed as a case series and were compared with those in Group B that comprised 12 patients with persistent proteinuria.

Results

Group A experienced acute proteinuria increases and significant hematuria increases compared with the −1-year (P = 0.006) and −3-year (P = 0.010) time points before the 2ndBx, which contrasted to the clinical course in Group B. In Group A, glomerulosclerosis (GS) and the arteriosclerosis score did not differ between the 2ndBx and the 1stBx, and most patients (88 %) showed cellular and/or fibrocellular crescents within the 2ndBx. Compared with Group B, the 2ndBx revealed that the percentage of cellular and/or fibrocellular crescents (P = 0.001) was significantly higher, whereas the percentage of GS (P = 0.012) and the arteriosclerosis score (P = 0.020) were significantly lower in Group A.

Conclusion

Rapid proteinuria and hematuria increases, and acute histological lesions characterize acute exacerbations in IgAN after favorable long-term clinical courses.

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Acknowledgments

This study was supported in part by a Grant-in-Aid for Progressive Renal Diseases Research from Japan’s Ministry of Health, Labour and Welfare.

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Correspondence to Yoichi Miyazaki.

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The authors have no conflicts of interest to declare.

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Tanaka, M., Miyazaki, Y., Koike, K. et al. Clinicopathological characteristics of patients with immunoglobulin A nephropathy showing acute exacerbations after favorable long-term clinical courses. Clin Exp Nephrol 20, 226–234 (2016). https://doi.org/10.1007/s10157-015-1153-8

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  • DOI: https://doi.org/10.1007/s10157-015-1153-8

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