Abstract
Background
The effect of isolated hematuria without proteinuria on kidney function decline, and the modification by the severity of proteinuria in general population are not fully elucidated.
Methods
Participants were included in the Japan Specific Health Checkups Study between 2008 and 2014. The exposure of interest was the frequency of dipstick hematuria during the observation. In each proteinuria frequency category (non-, occasional, persistent), hematuria-related decline in the eGFR rate was examined by analysis of covariance (ANCOVA). eGFR decline trajectories were also assessed using mixed-effects models.
Results
Among the 552,951 participants, 146,753 (26.5%) had hematuria, and 56,021 (10.1%) and 8,061 (1.5%) had occasional and persistent proteinuria, respectively. During the median follow-up of 3.0 years, annual change in eGFR decline in participants with hematuria was significantly faster than in those without hematuria (mean [95% confidence interval]: − 0.95 [− 0.98 to − 0.92] vs − 0.86 [− 0.87 to − 0.84] mL/min/1.73 m2/year; P < 0.001). In ANCOVA, the hematuria-related annual eGFR decline rate increased as proteinuria frequency categories increased (differences in annual eGFR decline rate between participants with and without hematuria: 0.08 [0.06 to 0.09] in participants with non-proteinuria category, 0.17 [0.15 to 0.18] in occasional proteinuria category, and 0.68 [0.65 to 0.71] mL/min/1.73 m2/year in persistent proteinuria category; P for interaction < 0.001). Similar results were obtained by the linear mixed-effect model.
Conclusions
Proteinuria has a synergistic effect on dipstick hematuria-related decline in kidney function. Among the general population without proteinuria throughout the observational period, the “isolated hematuria”-related eGFR decline was statistically significant but the difference was small.
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Acknowledgements
The authors acknowledge the contributions of the staff members who collected data and instructed subjects on urinalysis at screening centers in the following regions: Hokkaido, Yamagata, Miyagi, Fukushima, Tochigi, Ibaraki, Chiba, Saitama, Tokyo, Kanagawa, Niigata, Ishikawa, Fukui, Nagano, Gifu, Osaka, Hyogo, Okayama, Tokushima, Kochi, Fukuoka, Saga, Kumamoto, Oita, Miyazaki, and Okinawa. We would like to thank Editage for English language editing.
Funding
This work was supported by Health and Labor Sciences Research Grants for Research on Design of the Comprehensive Health Care System for Chronic Kidney Disease (CKD) Based on the Individual Risk Assessment by Specific Health Checkup from the Ministry of Health, Labor, and Welfare of Japan and a Grant-in-Aid for Research on Advanced Chronic Kidney Disease (REACH-J), Practical Research Project for Renal Disease from the Japan Agency for Medical Research and Development (AMED).
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Research idea and study design: HT, ME, HY, TU, FF, MN, TK, MM, KS, KT; data acquisition: HY, KI, CI, KA, KY, TK, SF, IN, MKa, YS, TM, MKo, TW, KT; data analysis/interpretation: HT, ME, KT; statistical analysis: HT, ME, HY; supervision or mentorship: ME, KT. Each author contributed important intellectual content during manuscript drafting or revision and accepted accountability for the overall work by ensuring that questions pertaining to the accuracy or integrity of any portion of the work were appropriately investigated and resolved.
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All procedures involving human participants were carried out in accordance with the ethical standards of the institutional research committee at which the studies were conducted (Fukushima Medical University; IRB Approval Number #1485, #2771) and in accordance with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards. This study was conducted in accordance with the Ethical Guidelines for Medical and Health Research Involving Human Subjects that was enacted by the Ministry of Health, Labour and Welfare of Japan (http://www.mhlw.go.jp/file/06-Seisakujouhou-10600000-Daijinkanboukouseikagakuka/0000069410.pdf). In the context of these guidelines, investigators are not necessarily required to obtain informed consent. Instead, we provided public information concerning the study on our website (http://www.fmu.ac.jp/univ/sangaku/data/koukai_2/2771.pdf) and ensured that there were opportunities for the research participants to refuse the use of their personal information.
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Tasaki, H., Eriguchi, M., Yoshida, H. et al. Synergistic effect of proteinuria on dipstick hematuria-related decline in kidney function: The Japan Specific Health Checkups (J-SHC) Study. Clin Exp Nephrol 27, 990–1000 (2023). https://doi.org/10.1007/s10157-023-02390-6
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DOI: https://doi.org/10.1007/s10157-023-02390-6