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The use of higher erythropoietin (EPO) doses is associated with an increased risk of an adverse outcome and increased mortality in patients with renal failure. Resistin is related to heart disease, and may contribute to an increased atherosclerotic risk. We hypothesized that a link between resistin and EPO responsiveness may exist. We therefore investigated the relationship between resistin and the EPO resistance index (ERI) in nondiabetic hemodialysis (HD) patients. Fifty-seven patients enrolled in the study underwent HD for ≥ 3 months and intravenous EPO therapy to maintain a target hemoglobin (Hb) level of 11.0 g/dl. The ERI was defined as the weekly EPO dose per unit Hb per body weight. The mean patient age was 52.6 ± 11.9 years and the mean time on dialysis was 4.9 ± 4.4 years. Serum Hb and ERI were 10.4 ± 0.7 g/dl, and 13.3 ± 7.0 (IU/kg/week/g/dl), respectively. Serum resistin levels were 23.6 ± 9.3 µg/L. EPO resistance is associated with low body mass index (BMI) (coefficient β =-0.393, p = 0.002) and with high serum resistin levels (coefficient β = 0.332, p = 0.018). According to a multiple regression analysis, the serum resistin level was a significant independent factor related to EPO resistance (p = 0.017). The results suggest that serum resistin levels reflect EPO responsiveness in nondiabetic HD patients. Resistin may therefore be considered as a new marker of EPO responsiveness in HD patients.

Serum Resistin as a Novel Marker of Erythropoietin Resistance in Nondiabetic Patients on Hemodialysis