Evidence for persistent vitamin D 1-alpha-hydroxylation in hemodialysis patients: evolution of serum 1,25-dihydroxycholecalciferol after 6 months of 25-hydroxycholecalciferol treatment

Nephron. Clinical Practice
Guillaume JeanCharles Chazot

Abstract

End-stage renal disease (ESRD) patients are thought to have impaired 1-alpha-hydroxylase capacity, but an extrarenal source of 1,25(OH)(2)D has been recognized. The aim of this study was to assess the evolution of serum 1,25(OH)(2)D in hemodialysis (HD) patients with vitamin D deficiency after 6 months of 25(OH)D(3) supplementation, and to identify the factors associated with persistent 1,25(OH)(2)D production. HD patients in a HD center with vitamin D deficiency (i.e. 25(OH)D <75 nmol/l) who were not receiving any vitamin D derivatives or calcimimetics were studied. Patients who had previously undergone parathyroidectomy or nephrectomy or those with uncontrolled hypercalcemia or hyperphosphatemia were excluded from this study. The patients were administrated a dose of 10-30 microg/day of oral 25(OH)D(3) based on the severity of their deficiency. The serum levels of 25(OH)D and 1,25(OH)(2)D evolution after 6 months were recorded. Responders were defined as patients with an increase in serum 1,25(OH)(2)D levels greater than the median value. Changes in mineral metabolism parameters were compared with those in the nonresponders. Of the 253 patients, 225 (89%) were vitamin D-deficient, and 43 met the inclusion criteria. The patien...Continue Reading

Citations

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