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Related Experiment Videos

Polyacrylonitrile complement activation attenuated by simultaneous ultrafiltration and adsorption.

A Röckel1, J Hertel, W T Perschel

  • 1Department of Nephrology, Deutsche Klinik für Diagnostik, Wiesbaden, FRG.

Nephrology, Dialysis, Transplantation : Official Publication of the European Dialysis and Transplant Association - European Renal Association
|January 1, 1987
PubMed
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Polyacrylonitrile (PAN) membranes show slight complement activation during dialysis, with complement components C3a and C5a increasing in blood. However, C4a levels decrease, indicating removal by the dialyzer through adsorption and ultrafiltration.

Area of Science:

  • Biomaterials Science
  • Immunology
  • Nephrology

Background:

  • Polyacrylonitrile (PAN) membranes are considered biocompatible due to minimal complement activation and leucocyte sequestration.
  • Low concentrations of C3a and C5a during PAN dialysis may stem from the polymer's low activation potential or elimination by the dialyzer.

Purpose of the Study:

  • To investigate the complement activation and elimination mechanisms of PAN membranes during hemodialysis.
  • To quantify the levels of complement components C3a, C4a, and C5a in blood and ultrafiltrate during PAN dialysis.

Main Methods:

  • Hemodialysis using synthetic polyacrylonitrile (PAN) membranes (Filtral; Hospal).
  • Measurement of arteriovenous concentration differences for complement components (C3a, C4a, C5a).
  • Analysis of sieving coefficients and detection of complement components in ultrafiltrate.

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Main Results:

  • Slight complement activation via the alternate pathway was suggested by increased C3a and C5a in efferent blood.
  • Significantly lower C4a in efferent blood indicated elimination within the dialyzer.
  • Adsorption and ultrafiltration were identified as elimination mechanisms, particularly in the initial 20 minutes of dialysis.

Conclusions:

  • PAN membranes exhibit a slight complement activation potential.
  • Complement components are effectively removed from blood by PAN dialyzers through adsorption and ultrafiltration.
  • These findings support the biocompatibility of PAN membranes in hemodialysis.