Objective:A kinetic model of the clearance of protein-bound uremic toxins (PBUTs) in maintenance hemodialysis patients is established to evaluate the effects of adding sorbents with different sorption efficiency to dialysate on the clearance rate of PBUTs, and to predict the sorption efficiency of sorbents using the model.Methods:The kinetic model was established by integrating the parameters of plasma flow rate ( Qp), dialysate flow rate ( Qd), free plasma fraction of PBUTs ( f1), free dialysate fraction of PBUTs ( f2), mass transfer coefficient of dialyzer ( K) and surface area of dialysis membrane ( A), and using the mass balance equation and Fick's first law. The model was also used to evaluate the relationship between the clearance rate of different PBUTs and the parameters of dialyzer and the sorption efficiency of sorbents. Results:The kinetic model of PBUTs clearance (CL): ?CL=Qp1-f1-f2γφf1-f2γ,?γ=QpQd,?φ=eKAf1Qp-f2Qd. The model was used to analyze the dialysis parameters of indoxyl sulfate and p-cresol sulfate dialysis.The clearance rate of PBUTs increased with the decrease of its binding capacity to albumin in plasma and the increase of plasma flow rate in dialyzer, dialysate flow rate, mass transfer coefficient of dialyzer, surface area of dialysis membrane, and sorption capacity of sorbents in dialysate. The increasing trend of PBUTs clearance rate was particularly obvious after applying sorbents. Further analysis of the dialysate flow rate and the sorption efficiency of sorbents in the dialysate showed that the increase of the dialysate flow rate could make up for the difference of the sorption efficiency of sorbents. When the dialysate flow rate tended to be infinite, the sorption efficiency of sorbents in the dialysate had no effect on the clearance rate of PBUTs. Conclusion:Adding sorbents of PBUTs to the dialysate during dialysis can significantly improve the clearance rate of PBUTs, suggesting a promising clinical application value.

Objective·To investigate the relation between urinary excretion of protein-bound uremic toxins(PBUTs)and upper urinary tract calculus.Methods·Residents aged 18?80 years in the community of Haitou,Danzhou city in Hainan Province were recruited.Basic information and diet for the last 3 d of the subjects were recorded.Their fasting sera and 24-hour urine samples were collected,and they also underwent ultrasound examination of kidneys and ureters.The subjects with upper urinary calculi detected by ultrasound or a clear history of upper urinary calculi were selected as the calculus group,and the others as the non-calculus group.The biochemical indicators related to the formation of calculus in blood and urine were detected,and the levels of PBUTs,including indoxyl sufate(IS),indole-3-acetic acid(IAA),and p-cresol sulfate(PCS)in blood and urine,as well as oxalic acid and citric acid in urine were detected by high-performance liquid chromatography.The related factors of upper urinary tract calculus formation were analyzed by multivariate Logistic regression.The correlations of urine PBUTs with urine uric acid,oxalic acid,and citric acid were analyzed by Spearman correlation test.Results·A total of 117 participants were screened out with 54 people in the calculus group and 63 people in the non-calculus group.There were no significant differences between the two groups in terms of gender,age,serum indicators,and prevalence of complications such as hypertension,diabetes,and hyperuricemia/gout.The 24-hour urine pH,calcium,uric acid,and chlorine in the calculus group were significantly higher than those in the non-calculus group(all P<0.05),while IS was significantly lower than that in the non-calculus group(P<0.05).Multivariate Logistic regression analysis showed that urinary IS(OR=0.929,95%CI 0.875?0.986,P=0.016)was related to the calculus formation independently,in addition to urinary calcium.The Spearman correlation analysis results showed that the levels of IAA(r=0.420,P=0.000)and PCS(r=0.307,P=0.001)in 24-hour urine were positively correlated with oxalic acid,PCS was positively correlated with uric acid(r=0.297,P=0.002),and IS was positively correlated with citric acid(r=0.289,P=0.002).Conclusion·In the population,a decrease in urinary excretion of IS may be an independent risk factor for the formation of upper urinary tract calculus,and PBUTs levels are correlated with levels of uric acid,oxalic acid,and citric acid.