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Nephrotic range proteinuria as a strong risk factor for rapid renal function decline during pre-dialysis phase in type 2 diabetic patients with severely impaired renal function

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Abstract

Background

Proteinuria is an established risk factor for progression of renal disease, including diabetic nephropathy. The predictive power of proteinuria, especially nephrotic range proteinuria, for progressive renal deterioration has been well demonstrated in diabetic patients with normal to relatively preserved renal function. However, little is known about the relationship between severity of proteinuria and renal outcome in pre-dialysis diabetic patients with severely impaired renal function.

Methods

125 incident dialysis patients with type 2 diabetes were identified. This study was aimed at retrospectively evaluating the impact of nephrotic range proteinuria (urinary protein–creatinine ratio above 3.5 g/gCr) on renal function decline during the 3 months just prior to dialysis initiation.

Results

In total, 103 patients (82.4 %) had nephrotic range proteinuria. The median rate of decline in estimated glomerular filtration rate (eGFR) in this study population was 0.98 (interquartile range 0.51–1.46) ml/min/1.73 m2 per month. Compared to patients without nephrotic range proteinuria, patients with nephrotic range proteinuria showed significantly faster renal function decline (0.46 [0.24–1.25] versus 1.07 [0.64–1.54] ml/min/1.73 m2 per month; p = 0.007). After adjusting for gender, age, systolic blood pressure, serum albumin, calcium–phosphorus product, hemoglobin A1c, and use of an angiotensin-converting enzyme inhibitor or an angiotensin II receptor blocker, patients with nephrotic range proteinuria showed a 3.89-fold (95 % CI 1.08–14.5) increased risk for rapid renal function decline defined as a decline in eGFR ≥0.5 ml/min/1.73 m2 per month.

Conclusion

Nephrotic range proteinuria is the predominant renal risk factor in type 2 diabetic patients with severely impaired renal function receiving pre-dialysis care.

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Conflict of interest

The authors have declared that no conflict of interest exists.

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Authors and Affiliations

  1. Department of Nephrology, Osaka Red Cross Hospital, 5-30 Fudegasaki-cho, Tennoji-ku, Osaka, 543-8555, Japan

    Yuichiro Kitai, Yohei Doi, Keisuke Osaki, Sayaka Sugioka, Masao Koshikawa & Akira Sugawara

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  1. Yuichiro Kitai
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  2. Yohei Doi
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  3. Keisuke Osaki
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  4. Sayaka Sugioka
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  5. Masao Koshikawa
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  6. Akira Sugawara
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Correspondence to Akira Sugawara.

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Kitai, Y., Doi, Y., Osaki, K. et al. Nephrotic range proteinuria as a strong risk factor for rapid renal function decline during pre-dialysis phase in type 2 diabetic patients with severely impaired renal function. Clin Exp Nephrol 19, 1037–1043 (2015). https://doi.org/10.1007/s10157-015-1094-2

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  • DOI: https://doi.org/10.1007/s10157-015-1094-2

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