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Nephrol Dial Transplant (1999) 14: 2731-2733
© 1999 European Renal Association-European Dialysis and Transplant Association

Clinical Observations

Mobilization of lead from bone in end-stage renal failure patients with secondary hyperparathyroidism

Michèle Kessler, Pierre Y. Durand, Than Cao Huu, M. José Royer-Morot2, Jacques Chanliau, Patrick Netter2 and Michel Duc1

Departments of Nephrology and 1 Internal Medicine and 2 Laboratory of Pharmacology and Toxicology, University Hospital of Nancy, France

Correspondence and offprint requests to: Professor Michèle Kessler, Service de Néphrologie, Hôpitaux de Nancy, 54500 Vandoeuvre les Nancy, France.

Abstract

Background. It is now recognized that long-term exposure to even low levels of lead may increase bone lead content. Lead can then be released in toxicologically significant amounts during critical states of increased bone turnover.

Methods. Two patients with end-stage renal failure, one on haemodialysis and the other on continuous ambulatory peritoneal dialysis (CAPD), had been exposed to lead and developed secondary hyperparathyroidism. An edetate calcium disodium (EDTA) test was performed in combination with haemofiltration or CAPD before and after parathyroidectomy.

Results. Before parathyroidectomy, both patients had low delta aminolaevulinic acid dehydrase (ALA-D) and high concentrations of chelated lead. After parathyroidectomy, there was a dramatic decrease in chelated lead and the ALA-D returned to normal.

Conclusion. Secondary hyperparathyroidism increases mobilization of bone lead in dialysis patients with an elevated lead burden. This may cause toxic effects.

Keywords: end-stage renal failure; haemodialysis; lead poisoning; peritoneal dialysis; secondary hyperparathyroidism


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