Erythropoietin, folic acid deficiency and hyperhomocysteinemia: Is there a possible relationship in chronically hemodialyzed patients?

A. Korzets, Y. Ori, A. Chagnac, T. Weinstein, M. Herman, D. Zevin, T. Malachi, U. Gafter

Research output: Contribution to journalArticlepeer-review

Abstract

Aims: To examine the possible relationships between recombinant human erythropoietin (rhEPO) therapy, serum folic acid and homocysteine levels in a cohort of stable, chronically hemodialyzed patients. Material and methods: The study was cross-sectional in its first phase and consisted of 3 groups of subjects (group 1:6 healthy controls; group 2:7 dialyzed patients not receiving rhEPO; group 3: 14 patients on rhEPO therapy). Hematological and biochemical parameters were taken after an overnight fast in all subjects. The second phase of the study was prospective, and included 8 dialyzed patients, and investigated the effects of a 6-month period of folic acid supplementation (10 mg, 3 times a week) on the same parameters examined in the first phase of the study. Results: In the first part of the study hemoglobin levels were near-normal, or normal, in all patients. No differences in hemoglobin or hematocrit values were observed in the 3 groups. 80% of all hemodialyzed patients had low serum folic acid levels, irrespective of whether they were receiving rhEPO. Serum erythropoietin level was elevated in group 3 (23.3 ± 10.4 mIU/ml). In group 2, serum erythropoietin level was not different from that of the healthy controls (13.5 ± 11.2 vs. 8.0 ± 5.4 mIU/ml, p = n.s.). Total serum homocysteine levels were elevated in all dialyzed patients (group 2: 24.7 ± 9.2 μmol/l; group 3: 31.6 ± 14.4 μmol/l), with a significant difference seen when comparing controls and those dialyzed patients on rhEPO therapy (8.7 ± 2.2 vs. 31.6 ± 14.4 μmol/l; p < 0.05). Significant correlations (ANOVA) were observed between serum erythropoietin and folic acid levels (r = -0.382; p = 0.049), and between folic acid and homocysteine levels (r = -0.560; p = 0.002). In the second part of the study folic acid supplementation led to a highly significant reduction in homocysteine levels (20.9 ± 4.9 vs. 11.9 ± 2.5 μmol/l; p < 0.0005). Two of 3 patients receiving rhEPO therapy, had rhEPO discontinued after commencing folic acid, as hemoglobin levels remained adequate, even without rhEPO. Conclusions: In hemodialyzed patients, the presence of a near-normal hemoglobin level, irrespective of rhEPO therapy, implies efficient erythropoiesis. Without adequate folic acid reserves, folic acid deficiency may develop in these patients and this will aggravate already high homocysteine levels. Therefore, folic acid supplementation is warranted in hemodialyzed patients, especially in those patients with hemoglobin levels approaching normal. This treatment is safe and effective in reducing homocysteine levels, especially when given in high doses for prolonged periods of time.

Original languageEnglish
Pages (from-to)48-54
Number of pages7
JournalClinical Nephrology
Volume53
Issue number1
StatePublished - 2000

Keywords

  • Erythropoietin
  • Folic acid
  • Hemodialysis
  • Homocysteine

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