Abstract
Background
Renal resistive index (RI) calculated using renal Doppler ultrasonography (RDU) has recently been considered a clinically important indicator of renal outcome, survival, and systemic arteriosclerotic disorders. However, the cause of RI elevation remains unclear. The present study was an effort to first, identify the factors related to RI elevation, and second, understand the effect of renin-angiotensin system inhibitors (RAS-Is) on renal RI elevation.
Methods
We carried out this single-center case-control study among 100 CKD patients, recruited from outpatients who underwent RDU more than twice, at least a year apart. The rate of renal RI change per year (dRIpy) was chosen as the dependent variable: [(last examined renal RI—initial examined renal RI)/(initial examined renal RI × period of observation) × 100 (%/year)]. We examined the association between dRIpy and other clinical and biological data.
Results
Among 100 CKD patients, the average serum creatinine and eGFR were 1.76 ± 0.84 mg/dL and 37.0 ± 18.2 ml/min/1.73 m2, respectively. The average dRIpy in all patients was 1.8 ± 1.4%/year. The linear multiple regression demonstrated that dRIpy was positively associated with the presence of diabetes mellitus (DM) and high low-density lipoprotein cholesterol (LDL) levels, and negatively with eGFR and RAS-I use.
Conclusions
This study demonstrated that the elevation of RI was related to DM, eGFR, high LDL, and the use of RAS-Is. In particular, RAS-Is could contribute towards suppressing the elevation of RI in CKD patients and towards preventing the development of renal failure in CKD patients.
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Informed consent was obtained from each participant. All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional review board and we confirmed the exemption of acquiring an approval number by the institutional review board based on the provisions about retrospective observational study. The study was conducted in accordance with the Declaration of Helsinki and its partial amendments.
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Yamaguchi, Y., Akagaki, F., Nakamori, A. et al. Chronological renal resistive index increases related to atherosclerotic factors, and effect of renin-angiotensin system inhibitors. Clin Exp Nephrol 23, 513–520 (2019). https://doi.org/10.1007/s10157-018-1667-y
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DOI: https://doi.org/10.1007/s10157-018-1667-y