Effects of vitamin E-coated dialyzer on oxidative stress and inflammation status in hemodialysis patients: a systematic review and meta-analysis

Abstract

Background: Vitamin E-coated dialyzer may have an effect on oxidative stress and inflammation status in hemodialysis (HD) patients. Therefore, we performed a systematic review to assess the anti-oxidation and anti-inflammatory effects of vitamin E-coated dialyzer in HD patients. Methods: The randomized controlled trials (RCTs) and quasi-RCTs of vitamin E-coated dialyzer versus conventional dialyzer for HD patients were searched from multiple databases. We screened relevant studies according to predefined inclusion criteria and performed meta-analyses using RevMan 5.1 software. Results: Meta-analysis showed vitamin E-coated dialyzer therapy could significantly decrease the serum thiobarbituric acid reacting substances (TBARS) (SMD, −0.95; 95% CI, −1.28 to −0.61; p < 0.00001), oxLDL (SMD, −0.61; 95% CI, −1.04 to −0.19; p = 0.005), interleukin-6 (IL-6) (SMD, −0.65; 95% CI, −0.97 to −0.32; p < 0.0001) and C-reactive protein (CRP) levels (SMD, −0.46; 95% CI, −0.87 to −0.05; p = 0.03) compared with that of the control group. However, vitamin E-coated dialyzer did not result in increasing the total antioxidant status (TAS) (SMD, 0.23; 95% CI, −0.16 to 0.61; p = 0.25) and the fractional clearance of urea index (Kt/v) levels (MD, −0.07; 95% CI, −0.14 to 0.00; p = 0.06), in addition, there was no significant difference in plasma superoxide dismutase (SOD) level compared with that of the conventional dialyzer & oral vitamin E group (SMD, 0.28; 95% CI, −0.20 to 0.75; p = 0.26). Conclusions: Vitamin E-coated dialyzer can reduce the oxidative stress and inflammation status reflected by the decreasing of serum TBARS, oxLDL, CRP, and IL-6 levels, and this new dialyzer does not affect the dialysis adequacy.

• Hemodialysis
• inflammation
• oxidative stress and meta-analysis
• vitamin E-coated dialyzer