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A new technique for low-volume continuous sampling of spent dialysate: a validation study

  • Rafael Bueno Orcy
  • Maria Fernanda Antunes
  • Jean Pierre Oses
  • Maristela BöhlkeEmail author
Original Article Artificial Kidney / Dialysis
  • 5 Downloads

Abstract

The measure of hemodialysis (HD) adequacy recommended nowadays by most guidelines, Kt/V-urea, presents significant drawbacks. Direct dialysis quantification (DDQ) through total dialysate collection (TDC), considered the gold standard measure of HD adequacy, is cumbersome, which precludes its widespread use in clinical practice. The present study aims to validate a low-volume continuous sampling of spent dialysate (CSSD). Cross-sectional study carried out at a university hospital. Throughout 4-h hemodialysis sessions, urea removal was measured by three DDQ methods: TDC, CSSD, and fractional sampling of dialysate (FSD). The primary outcome was the comparison between the total mass of urea removed measured by TDC and the dialysate sampling techniques. The comparison between urea distribution volume (UDV) estimated by anthropometric method and through DDQ was a secondary outcome. The analysis was done through linear regression and Bland–Altman concordance method. Twenty HD sessions were studied. The mean amount of urea collected in TDC and calculated from the 40-mL sample of CSSD were 33.70 ± 11.70 g and 33.90 ± 11.70 g, respectively [r 0.96, p < 0.0001; bias − 0.2 (95% CI − 1.8 to 1.4); limits of agreement − 6.8 to 6.4]. The anthropometric measure, when compared with DDQ method, underestimated UDV in patients with smaller body size. This new simple, inexpensive, and small volume CSSD technique can provide accurate information about the total amount of solutes removed by hemodialysis.

Keywords

Hemodialysis Adequacy Solute removal Direct dialysis quantification 

Notes

Author contributions

ORB and BM contributed to conception and design, analysis and interpretation of data, drafting and revising the article; OJP and AMF contributed to design, acquisition of data, analysis and interpretation of data, and revising the article.

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

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Copyright information

© The Japanese Society for Artificial Organs 2019

Authors and Affiliations

  1. 1.Postgraduate Program in Health and BehaviorCatholic University of PelotasPelotasBrazil
  2. 2.Dialysis and Renal Transplantation Unit, São Francisco de Paula University HospitalCatholic University of PelotasPelotasBrazil
  3. 3.Department of PhysiologyFederal University of PelotasPelotasBrazil

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