Comparative evaluation of oxidative and antioxidative capacity during high-flux hemodialysis using two different membranes.

Aim: In patients with end-stage renal disease (ESRD) cardiovascular morbidity and mortality are increased. Apart from traditional and uremia-specific factors oxidative stress has been implicated as a main risk factor. This study investigated the influence of two different high-flux hemodialysis membranes on parameters of oxidative stress during a dialysis session.

Patients And Methods: 14 stable ESRD patients were enrolled in the study and randomly assigned to high-flux hemodialysis using either a polyamide membrane (Polyflux 14; PA group) or a new polysulfone membrane (Diacap Polysulfone HI PS 15; PS group). All patients received 6 treatments with the same membrane. During the 5th treatment parameters of dialysis efficiency, biocompatibility (cell counts, complement C3a, thrombin-antithrombin complex) and oxidative stress (lipid peroxides, total antioxidative capacity) were measured.

Results: Parameters of dialysis efficiency and biocompatibility were similar in both treatment groups. At the beginning of the dialysis session both groups showed a low to moderate level of oxidative stress and a reduced total antioxidative capacity as compared to healthy controls. Both parameters deteriorated significantly during the extracorporeal procedure with a similar magnitude in both membrane groups. No correlation between oxidative or antioxidative capacity and parameters of biocompatibility or dialysis efficiency could be found.

Conclusions: Dialysis with synthetic high-flux membranes induces a temporary deterioration of oxidative stress parameters in ESRD patients despite good dialysis efficiency and biocompatibility.