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Nephrology Dialysis Transplantation, Vol 13, Issue 90003 91-93, Copyright © 1998 by Oxford University Press

ORIGINAL ARTICLES

Are plasma 1,25-dihydroxyvitamin D3 concentrations appropriate after successful kidney transplantation?

F Caravaca, M Fernandez, J Cubero, A Aparicio, F Jimenez and M Garcia
S. Nefrologia, Hospital Regional Universitario Infanta Cristina, E-06080 Badajoz, Spain; Corresponding author

We studied 28 patients with parathyroid hormone (PTH) concentrations >65 pg/ml immediately prior to kidney transplant and who had stable allograft function with serum creatinine <2 mg/dl. After 12-18 months of transplantation, biochemical parameters (including 25-hydroxy- and 1,25-dihydroxy-vitamin D3) were studied. Patients were divided into three groups according to their PTH concentrations. Patients with renal transplant were compared with 50 healthy subjects and 20 patients with primary hyperparathyroidism. The mean 1,25-dihydroxy-vitamin D3 concentration of the transplant patients did not differ from the controls, but was lower than in patients with primary hyperparathyroidism. Using univariate linear regression analysis, 1,25-dihydroxy vitamin D3 correlated positively with PTH (P=0.008) and serum calcium (P=0.0015), and inversely with creatinine clearance (P=0.01). However, it did not correlate significantly with serum phosphorus. Our data suggest that renal transplant recipients may have an inappropriate production of 1,25-dihydroxy vitamin D3; suboptimal allograft function may be a major limiting factor.Keywords: 1,25-hydroxyvitamin D3; kidney transplant; phosphorus, secondary hyperparathyroidism
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