RESUMO
OBJECTIVE: To investigate the impact of alpha-lipoic acid (ALA) on inflammation, oxidative stress, anemia, and glycemic parameters and their association with cardiovascular risk in diabetic patients on hemodialysis. PATIENTS AND METHODS: In this multi-center, randomized, controlled study, 60 diabetic patients on hemodialysis were randomized into control group (n=30) which received Epoetin-alpha plus insulin therapy, and alpha-lipoic acid group (n=30) which received the same treatment plus alpha-lipoic acid (ALA) 600 mg once daily. Serum levels of high sensitivity C-reactive protein (hs-CRP), tumor necrosis factor-alpha (TNF-α), 8-hydroxy-2'-deoxyguanosine (8-OHdG), creatinine, urea, blood urea nitrogen (BUN), hemoglobin (Hb), iron parameters, fasting blood glucose (FBG), glycated hemoglobin (HbA1c), and fructosamine were measured at baseline and six months after intervention. The ankle-brachial index (ABI) was used to evaluate the clinical outcome. Erythropoietin resistance index (ERI), the weekly cost of Epoetin-alpha doses, and the total cost were calculated. RESULTS: The two groups were statistically similar at baseline. After the intervention, as compared to the control group, ALA group showed significant reductions in serum levels of hs-CRP, TNF-α, 8-OHdG (p<0.001), urea, and BUN (p=0.029) with significant elevations in Hb concentration (p<0.001), serum iron (p=0.037) and transferrin saturation (p<0.001). ALA group showed a significant decline in FBG (p=0.004), HbA1c (p<0.001), fructosamine (p=0.005), ERI (p<0.001), weekly doses, and the weekly cost of Epoetin-alpha, and the total cost (p<0.001). ALA provided a cardio-protective effect, whereas the percentage of patients with acceptable ABI (0.9-1) was significantly higher in ALA group than in the control group (p=0.024), and those with abnormally low ABI (<0.9) were lower in the ALA group. CONCLUSIONS: Due to its efficacy and safety, alpha-lipoic acid represents a pharmaco-economic supplement for diabetic patients on hemodialysis. Further trials are needed for complete evaluation of ALA effects.
