Abstract
Background and aim
The available clinical data are limited in a rare glomerular disease, renal amyloidosis. We aimed to clarify the clinical features of renal amyloidosis from database of the Japan Renal Biopsy Registry (J-RBR).
Methods
We performed a cross-sectional study with database of the J-RBR of the Japanese Society of Nephrology. We identified 281 cases of renal amyloidosis from 20,997 cases enrolled into the J-RBR from 2007 to 2014. Systolic blood pressure (SBP) and diastolic blood pressure (DBP) were compared among the levels of ages, amount of urine protein excretion (AUPE) or CKD G stages.
Results
The prevalence of renal amyloidosis was 1.3 % (281/20,997). DBP significantly decreased in higher age quartiles (P = 0.034). SBP and DBP did not increase in the progression of AUPE levels and CKD G stages. In multiple regression analysis, eGFR was a significant independent factor for SBP in all cases and a subgroup without hypertensive agents. There was a reverse significant relationship between SBP and eGFR.
Conclusion
Blood pressure did not significantly increase in elderly and much proteinuric condition in renal amyloidosis. The progression of CKD and decrease of eGFR did not produce the higher SBP. The mechanism underlying these results remains unclear; however, they are unique features of renal amyloidosis. The couple of hypotensive and hypertensive conditions might produce no relationship between blood pressure and CKD stages.
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Acknowledgments
The authors are grateful for the help and support from the J-RBR committee and all of the colleagues who participated in the J-RBR governed by Japanese Society of Nephrology. This study was supported by a grant-in-aid from the Research Group on Progressive Renal Disease, Grant-in-Aid for Research on Advanced Chronic Kidney Disease, from the Japan Agency for Medical Research and Development, and the Amyloidosis Research Group from the Ministry of Health Labor and Welfare (Number H26-057), Japan.
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The ethical committee of the Japanese Society of Nephrology comprehensively examined and approved the study protocol. The J-RBR is registered at the Clinical Trial Registry of UMIN (UMIN000000618). Informed consent was obtain from all participants.
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The authors declare no conflict of interest regarding this paper.
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Nishi, S., Muso, E., Shimizu, A. et al. A clinical evaluation of renal amyloidosis in the Japan renal biopsy registry: a cross-sectional study. Clin Exp Nephrol 21, 624–632 (2017). https://doi.org/10.1007/s10157-016-1326-0
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DOI: https://doi.org/10.1007/s10157-016-1326-0