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Cystatin C levels in functionally anephric patients undergoing dialysis: the effect of different methods and

Najila Al-Malki1, Paul A Heidenheim, Guido Filler

  • 1Department of Medicine, and London Health Sciences Centre, Nephrology Division, The University of Western Ontario, London, Canada.

Clinical Journal of the American Society of Nephrology : CJASN
|August 29, 2009
PubMed

Insights

Serum cystatin C levels are influenced by dialysis method and intensity. This protein may help monitor dialysis adequacy in patients with kidney failure.

Area of Science:

  • Nephrology
  • Biochemistry
  • Clinical Chemistry

Background:

  • Cystatin C is a protein filtered by glomeruli and degraded by tubules.
  • Serum cystatin C concentration is a proposed marker for glomerular filtration rate (GFR).
  • Cystatin C's molecular size suggests it is dialyzable.

Purpose of the Study:

  • To investigate the influence of dialysis method and intensity on serum cystatin C levels.
  • To assess cystatin C as a potential marker for dialysis adequacy.

Main Methods:

  • Cross-sectional pilot study of functionally anephric dialysis patients.
  • Measured predialysis cystatin C in patients undergoing conventional, nocturnal, daily hemodialysis, and automated peritoneal dialysis.
  • Assessed urea kinetic parameters (Sp Kt/V, Std Kt/V, nPNA) and inflammatory markers (CRP, TSH).

Main Results:

  • Serum cystatin C levels showed significant differences across dialysis modalities.
  • A significant inverse linear correlation was found between cystatin C and standard weekly Kt/V (Std Kt/V).
  • Cystatin C levels were stable and not influenced by nPNA, CRP, or TSH.

Conclusions:

  • Dialysis method and intensity significantly influence serum cystatin C levels.
  • Serum cystatin C may serve as a valuable tool for monitoring dialysis treatment adequacy.
Abstract

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