title: [The effects of dialysate and ultrafiltration flow rate on solute clearance during continuous renal replacement therapy].
abstract: OBJECTIVE
  To study the solute clearance during various forms of continuous renal replacement therapy(CRRT) and test the formulas that allow the prediction of the influence of dialysate and ultrafiltration flow rate on small solute removal during CRRT.
  
  
  METHODS
  Five patients with acute renal failure were included in the study and were treated by venovenous CRRT using the PRISMA predilution system. Solute clearance of urea nitrogen(UN), creatinine(Cr), uric acid(Ua), phosphate(P) and beta(2)-microglobulin(beta(2)-M) were evaluated during CRRT with different dialysates and ultrafiltration flow rates.
  
  
  RESULTS
  The determined clearance of small molecular solutes during continuous venovenous hemofiltration (CVVH) and continuous venovenous hemodialysis(CVVHD) was similar with the following formulas: K(UF) = (Q(UF)/60) x Q(B)/(Q(B) + Q(UF)/60) (in CVVH), Kd = Q(D)/60 (in CVVHD), where K is the clearance, Q(B), Q(D) and Q(UF) are blood, dialysate and ultrafiltration flow rates, respectively. There was very significant correlation between calculated values of K(UF) and observed clearances of small solutes such as UN, Cr, Ua and P during CVVH, between calculated values of Kd and observed clearances of UN, Cr, Ua but not P during CVVHD (P < 0.001). Clearances of UN, Cr, Ua and P during CVVHD were greater than those during CVVH, but clearance of beta(2)-M during CVVHD was less than that during CVVH. Interaction between convection and diffusion was found during continuous venovenous hemodiafiltration (CVVHDF).
  
  
  CONCLUSIONS
  The previous formulas can provide with the prediction of the clearance of small molecular solutes during CVVH and CVVHD. The present results demonstrate that diffusion is more efficient in removing small solutes than convection but less efficient in removing large solutes than convection. There is interaction between convection and diffusion during CVVHDF.
authors.affiliation: Research Institute of Nephrology, Jinling Hospital, Nanjing 210002, China.
authors.forename: D
authors.initials: D
authors.lastname: Gong
authors.forename: D
authors.initials: D
authors.lastname: Ji
authors.forename: H
authors.initials: H
authors.lastname: Xie
authors.forename: B
authors.initials: B
authors.lastname: Xu
authors.forename: Y
authors.initials: Y
authors.lastname: Liu
authors.forename: L
authors.initials: L
authors.lastname: Li
mesh_terms: D058186:Acute Kidney Injury / Q000628:therapy*; D000328:Adult; D015314:Dialysis Solutions; D005260:Female; D017583:Hemodiafiltration; D006440:Hemofiltration; D006801:Humans; D008297:Male; D008657:Metabolic Clearance Rate; D008875:Middle Aged; D006435:Renal Dialysis; D017582:Renal Replacement Therapy / Q000379:methods*; D014462:Ultrafiltration
chemical_list: D015314:Dialysis Solutions