No trend toward a spontaneous improvement of hyperparathyroidism and high bone turnover in normocalcemic long-term renal transplant recipients

American Journal of Kidney Diseases : the Official Journal of the National Kidney Foundation
G DumoulinJ Regnard

Abstract

Although hyperparathyroidism is a common feature in renal transplant recipients, the long-term course of parathyroid hormone (PTH) secretion in these patients is not well established, and the actual contribution of PTH to posttransplant bone disease remains incompletely understood. Therefore, we studied calcium-regulating hormones and serum osteocalcin, as a marker of bone remodeling, in 82 normocalcemic renal transplant recipients with good renal function who had received a graft 6 to 73 months previously and in 82 healthy subjects matched for age and sex. In all subjects, fasting serum and 24-hour urinary samples were collected. The transplant recipients had excessive PTH secretion (serum PTH, 6.9 +/- 0.5 pmol/L in recipients v 3.0 +/- 0.1 pmol/L in healthy subjects; P < 0.001) and high bone turnover (osteocalcin, 16.6 +/- 0.8 microg/L v 8.0 +/- 0.3 microg/L; P < 0.001). (Values are mean +/- SEM.) In addition, transplant recipients had a slightly higher ionized calcium than the healthy subjects, providing definite evidence of an inappropriate PTH secretion in renal transplant recipients. Furthermore, in subgroups of 25 recipients and 25 healthy controls matched for creatinine clearance, the results superimposed those obtained...Continue Reading

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