Plasma exchange induces vitamin D deficiency

T F Hiemstra, A Casian, P Boraks, D R Jayne, I Schoenmakers

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13 Citations (Scopus)

Abstract

BACKGROUND: Plasma exchange is used in the treatment of diseases mediated by pathogenic circulating proteins, or for transplant desensitization. Its non-targeted nature results in the depletion of physiologically important molecules, and it is often complicated by hypocalcaemia. 

AIM: To determine the effects of plasma exchange on vitamin D binding protein (DBP) and associated vitamin D metabolites. 

DESIGN: Single-centre prospective cohort study of 11 patients. 

METHODS: DBP and vitamin D metabolites were measured before and immediately after five plasma exchanges, and 7 and 28 days after discontinuation of plasma exchange. 

RESULTS: Plasma exchange reduced plasma DBP concentration from 196.9 ± 53.2 to 98.5 ± 34 μg/ml (P = 0.0001), 1,25-dihydroxyvitamin D from 103 ± 52 to 42 ± 4 pmol/l (P = 0.003) and 25-hydroxyvitamin D from 49.7 ± 29 to 22 ± 9.4 nmol/l (P = 0.0017), through their removal in effluent. After 7 days, DBP and 1,25-dihydroxyvitamin D were not significantly different from baseline, but 25-hydroxyvitamin D remained significantly lower after 7 days (26.4 ± 9.8 nmol/l, P = 0.02) and 28 days (30.8 ± 15.5 nmol/l, P = 0.048). Corrected calcium decreased from 2.23 ± 0.11 to 1.98 ± 0.08 mmol/l (P = 0.0007) immediately after five treatments. Plasma calcium was significantly associated with 1,25-dihydroxyvitamin D (r(2) = 0.79, P < 0.0001). 

CONCLUSION: Plasma exchange induced an acute reversible decrease in plasma 1,25-dihydroxyvitamin D, DBP, calcium and a sustained decrease in plasma 25-hydroxyvitamin D.

Original languageEnglish
Pages (from-to)123-130
Number of pages8
JournalQJM
Volume107
Issue number2
Early online date15 Oct 2013
DOIs
Publication statusPublished - 1 Feb 2014

Keywords

  • Adult
  • Aged
  • Calcium
  • Female
  • Humans
  • Male
  • Middle Aged
  • Plasma Exchange
  • Prospective Studies
  • Vitamin D
  • Vitamin D Deficiency
  • Vitamin D-Binding Protein

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