The Effect of Vitamin D Deficiency Treatment on Hemoglobin Levels in Hemodialysis Patients: A Double-blind, Randomized Controlled Trial

Abstract

Background: The role of vitamin D deficiency and hemoglobin levels in renal anemia is well established. However, few studies with inconsistent findings have examined the relationship between vitamin D supplementation and the prevalence and severity of anemia in the chronic kidney disease. Objectives: The present study aimed to evaluate the effect of vitamin D deficiency treatment on hemoglobin levels in hemodialysis patients. Methods: The present study was a double-blind, randomized controlled trial on 60 hemodialysis patients aged 18 - 83 years, who were undergoing maintenance dialysis and receiving erythropoietin. All patients with vitamin D (< 30 ng/mL) referred to the dialysis wards of Imam Khomeini, Razi, and Sina hospitals in Ahvaz in 2019, were assigned into two groups. One group was treated with 500 mg oral calcium-D tablets three times a day, and another group was treated with 50,000 units of D-Pearls weekly. The two groups were treated for 12 weeks. Then they were re-evaluated in terms of response to treatment and the rate of improvement in hemoglobin levels and erythropoietin dose. Results: In each intervention group, vitamin D levels increased significantly (P < 0.001). D-Pearls improved vitamin D deficiency; however, the difference was not statistically significant. This study also showed a significant increase in hemoglobin (> 1 unit) in the calcium-D group; however, such a change was not observed in the D-Pearls group (P = 0.3824). Moreover, there was no difference between the two groups in terms of erythropoietin dose (P = 0.98), blood calcium level (P = 0.57), parathyroid level (P = 0.20), and phosphorus (P = 0.99). Conclusions: Despite its significant limitations,this study revealed vitamin D supplements improved vitamin D deficincy, and calcium-D tablets could improve hemoglobin levels in patient.