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2015 ; 10
(12
): e0143813
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Plasma Levels of Middle Molecules to Estimate Residual Kidney Function in
Haemodialysis without Urine Collection
#MMPMID26629900
Vilar E
; Boltiador C
; Wong J
; Viljoen A
; Machado A
; Uthayakumar A
; Farrington K
PLoS One
2015[]; 10
(12
): e0143813
PMID26629900
show ga
BACKGROUND: Residual Kidney Function (RKF) is associated with survival benefits
in haemodialysis (HD) but is difficult to measure without urine collection.
Middle molecules such as Cystatin C and ?2-microglobulin accumulate in renal
disease and plasma levels have been used to estimate kidney function early in
this condition. We investigated their use to estimate RKF in patients on HD.
DESIGN: Cystatin C, ?2-microglobulin, urea and creatinine levels were studied in
patients on incremental high-flux HD or hemodiafiltration(HDF). Over sequential
HD sessions, blood was sampled pre- and post-session 1 and pre-session 2, for
estimation of these parameters. Urine was collected during the whole
interdialytic interval, for estimation of residual GFR (GFRResidual = mean of
urea and creatinine clearance). The relationships of plasma Cystatin C and
?2-microglobulin levels to GFRResidual and urea clearance were determined.
RESULTS: Of the 341 patients studied, 64% had urine output>100 ml/day, 32.6% were
on high-flux HD and 67.4% on HDF. Parameters most closely correlated with
GFRResidual were 1/?2-micoglobulin (r2 0.67) and 1/Cystatin C (r2 0.50). Both
these relationships were weaker at low GFRResidual. The best regression model for
GFRResidual, explaining 67% of the variation, was: GFRResidual = 160.3 · (1/?2m)
- 4.2. Where ?2m is the pre-dialysis ?2 microglobulin concentration (mg/L). This
model was validated in a separate cohort of 50 patients using Bland-Altman
analysis. Areas under the curve in Receiver Operating Characteristic analysis
aimed at identifying subjects with urea clearance?2 ml/min/1.73 m2 was 0.91 for
?2-microglobulin and 0.86 for Cystatin C. A plasma ?2-microglobulin cut-off of
?19.2 mg/L allowed identification of patients with urea clearance ?2 ml/min/1.73
m2 with 90% specificity and 65% sensitivity. CONCLUSION: Plasma pre-dialysis
?2-microglobulin levels can provide estimates of RKF which may have clinical
utility and appear superior to cystatin C. Use of cut-off levels to identify
patients with RKF may provide a simple way to individualise dialysis dose based
on RKF.