Document Detail

Estimation of delivered dialysis dose by on-line monitoring of the ultraviolet absorbance in the spent dialysate.
MedLine Citation:
PMID:  12722037     Owner:  NLM     Status:  MEDLINE    
BACKGROUND: Several methods are available to determine Kt/V, from predialysis and postdialysis blood samples to using on-line dialysate urea monitors or to ionic dialysance using a conductivity method. The aim of this study is to compare Kt/V calculated from the slope of the logarithmic on-line ultraviolet (UV) absorbance measurements, blood urea Kt/V, dialysate urea Kt/V, and Kt/V from the Urea Monitor 1000 (UM; Baxter Healthcare Corp, Deerfield, IL). METHODS: Thirteen uremic patients on chronic thrice-weekly hemodialysis therapy were included in the study. The method uses absorption of UV radiation by means of a spectrophotometric set-up. Measurements were performed on-line with the spectrophotometer connected to the fluid outlet of the dialysis machine; all spent dialysate passed through a specially designed cuvette for optical single-wavelength measurements. UV absorbance measurements were compared with those calculated using blood urea and dialysate urea, and, in a subset of treatments, the UM. RESULTS: Equilibrated Kt/V (eKt/V) obtained with UV absorbance (eKt/Va) was 1.19 +/- 0.23; blood urea (eKt/Vb), 1.30 +/- 0.20, and dialysate urea (eKt/Vd), 1.26 +/- 0.21, and Kt/V in a subset measured by the UM (UM Kt/V) was 1.24 +/- 0.18. The difference between eKt/Vb and eKt/Va was 0.10 +/- 0.11, showing a variation similar to the difference between eKt/Vb and eKt/Vd (0.03 +/- 0.10) and in a subset between eKt/Vb and UM Kt/V (-0.02 +/- 0.11). CONCLUSION: The study suggests that urea Kt/V can be estimated by on-line measurement of UV absorption in the spent dialysate.
Fredrik Uhlin; Ivo Fridolin; Lars-Göran Lindberg; Martin Magnusson
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Publication Detail:
Type:  Evaluation Studies; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  American journal of kidney diseases : the official journal of the National Kidney Foundation     Volume:  41     ISSN:  1523-6838     ISO Abbreviation:  Am. J. Kidney Dis.     Publication Date:  2003 May 
Date Detail:
Created Date:  2003-04-30     Completed Date:  2004-01-08     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  8110075     Medline TA:  Am J Kidney Dis     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1026-36     Citation Subset:  IM    
Department of Nephrology University Hospital, Linköping, Sweden.
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MeSH Terms
Aged, 80 and over
Hemodialysis Solutions / administration & dosage*,  pharmacokinetics
Middle Aged
Monitoring, Physiologic / instrumentation,  methods
Renal Dialysis
Spectrophotometry, Ultraviolet
Ultraviolet Rays
Urea / blood*
Uremia / metabolism,  therapy
Reg. No./Substance:
0/Hemodialysis Solutions; 57-13-6/Urea

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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