Maturation of dose-corrected tacrolimus predose trough levels in pediatric kidney allograft recipients

Transplantation
Maarten NaesensMinnie Sarwal

Abstract

In contrast to adult kidney recipients, in whom the long-term evolution and clinical determinants of tacrolimus pharmacokinetics are well studied, less is known about the long-term evolution of tacrolimus pharmacokinetics in pediatric kidney transplant recipients. One-hundred and five pediatric recipients of a kidney allograft, all treated with a corticosteroid-free immunosuppressive protocol, were included. The evolution of tacrolimus doses and predose trough (C0) levels was recorded at 3, 6, 9, 12, 18, and 24 months after transplantation, as well as all C0 levels obtained in the first 2 years after transplantation. The evolution and clinical determinants of tacrolimus exposure parameters were analyzed. Dose-corrected tacrolimus C0 levels (C0/dose/kg) increased in the first 2 years after kidney transplantation in pediatric recipients (P=0.001). This decrease in dose requirement by time was only significant in children older than 5 years at the time of transplantation (P=0.38, 0.03, and 0.001 for age groups <5, 5-12, and >12 years, respectively). In addition, the younger patients had significantly higher dose requirements (dose/kg) compared with older recipients (P=0.0002). Pediatric kidney transplant recipients exhibit maturat...Continue Reading

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