High-dose alfacalcidol improves anaemia in patients on haemodialysis

Abstract

Background. Alfacalcidol is efficient for treating secondary hyperparathyroidism in patients on maintenance haemodialysis (HD). Little is known about the direct impact of high-dose alfacalcidol on anaemia in end-stage renal failure. We therefore carried out a prospective study over 18 months to examine the direct effect of high-dose alfacalcidol on erythropoiesis in erythropoietin (rHuEpo)-dependent anaemic patients on HD for more than 6 months with moderate hyperparathyroidism. Study design. Twelve patients received oral alfacalcidol at a dosage of 6-7 μg per week and calcium carbonate during the first 12 months, calcium carbonate without alfacalcidol during the next 3 months, and again alfacalcidol and calcium carbonate during the last 3 months. Criteria for selection were haemoglobin < 10 g/dl, iPTH > 250 pg/ml, transferrin saturation (TS) > 25%, S-ferritin > 300 μg/l, and S-aluminium < 40 μg/l. Results. Haemoglobin (Hb) and reticulocyte counts increased during the first phase, decreased and returned to a baseline prior to starting vitamin D treatment in the second phase, and again increased when alfaclcidol was reintroduced, whereas iPTH decreased during the first 3 months of the first phase and then remained stable, as did S-calcium, which increased during the first 3 months and then remained constant. S-phosphate increased during the first and third phases, and decreased during the second phase. Two patients during the first phase and one patient during the third phase presented hypercalcaemia; requiring a temporary discontinuation of alfacalcidol. Conclusion. High-dose alfacalcidol is efficient in anaemic patients with moderate hyperparathyroidism on maintenance HD and has a direct effect on erythropoietic cells regardless of serum calcium and iPTH levels.