title: Influence of post haemodialysis sampling on Kt/V result.
abstract: The recommended Kt/V is 1.2. Unfortunately there is no written policy for nurses on the procedure for taking blood urea nitrogen samples post haemodialysis. The aim of this study was to establish the Kt/V variability of haemodialysis patients depending on the method of collection of post-haemodialysis blood urea nitrogen. Twenty-two patients were analysed. A Kt/V was performed every 15 days during a period of 2 months. It was taken five times on each patient: 30 minutes before the end of a haemodialysis session (Kt/V30), at the end of haemodialysis (Kt/V1), after slowing flows (50 ml/min) for 2 minutes (Kt/V2) and after the blood circuit had been returned to the patient at 5 and 15 minutes respectively. (Kt/V5, Kt/V15). The Kt/V results were: Kt/V1 1.23 +/- 0.2 Vs Kt/V2 1.14 +/- 0.19 (p < 0.003); Kt/V5- 1.05 +/- 0.19 (p < 0.002 Vs Kt/V2); Kt/V15 1 +/- 0.16 (p < 0.05 Vs Kt/V5); Kt/V30 1.12 +/- 0.21 (pNS Vs Kt/V2). In conclusion, there was a large variability in the Kt/V depending on the method of collection of the blood urea nitrogen sample post-haemodialysis.
authors.affiliation: Centro Los Llanos, Madrid, Spain.
authors.forename: C
authors.initials: C
authors.lastname: Gago
authors.forename: B
authors.initials: B
authors.lastname: Marco
authors.forename: J
authors.initials: J
authors.lastname: Fernández
authors.forename: M D
authors.initials: MD
authors.lastname: Piña
authors.forename: C
authors.initials: C
authors.lastname: Gálvez
authors.forename: A
authors.initials: A
authors.lastname: González
authors.forename: S
authors.initials: S
authors.lastname: Martínez
authors.forename: P
authors.initials: P
authors.lastname: Hernando
authors.forename: E
authors.initials: E
authors.lastname: Gruss
mesh_terms: D015982:Bias; D001800:Blood Specimen Collection / Q000379:methods*; D001806:Blood Urea Nitrogen; D005260:Female; D006801:Humans; D007676:Kidney Failure, Chronic / Q000097:blood* / Q000401:mortality / Q000628:therapy*; D008297:Male; D008875:Middle Aged; D006435:Renal Dialysis / Q000379:methods* / Q000451:nursing; D015203:Reproducibility of Results; D016019:Survival Analysis; D013997:Time Factors