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Pharmacokinetics of cyclosporin in children with stable renal transplants

J C Tam1, J W Earl, N S Willis

  • 1Centre for Kidney Research, Royal Alexandra Hospital for Children, PO Box 3515, Parramatta, NSW Australia 2124.

Pediatric Nephrology (Berlin, Germany)
|January 10, 2001
PubMed

Insights

Cyclosporine A (CSA) peak concentration (Cmax) is a better indicator of drug exposure in pediatric kidney transplant patients than trough levels (Cmin). Child

Area of Science:

  • Pharmacokinetics
  • Pediatric Nephrology
  • Transplantation

Background:

  • Cyclosporine A (CSA) is a crucial immunosuppressant in pediatric kidney transplantation.
  • Optimizing CSA dosing is vital for graft survival and minimizing toxicity.
  • Understanding CSA absorption variability in children is essential for effective therapeutic drug monitoring.

Purpose of the Study:

  • To evaluate the pharmacokinetic profile of cyclosporine A (CSA) in pediatric kidney transplant recipients.
  • To compare the utility of peak concentration (Cmax) versus trough concentration (Cmin) as a measure of CSA exposure.
  • To explore the relationship between patient age and CSA pharmacokinetic parameters.

Main Methods:

  • Pharmacokinetic analysis of whole blood CSA levels in 14 children (5-17 years) post-kidney transplant.
  • Measurement of CSA concentrations at multiple time points after the morning dose.
  • Model-independent pharmacokinetic analysis to determine AUC, CL/F, Vss/F, Tdel, Tmax, and Cmax.

Main Results:

  • Significant variability in absorption delay time (Tdel) and time to peak concentration (Tmax) was observed.
  • Patient age positively correlated with Tmax (Tmax = 0.027 age + 1.41).
  • Area under the curve (AUC) showed a strong correlation with Cmax (Cmax = 0.25 AUC + 423.32), suggesting Cmax is a reliable indicator of exposure.

Conclusions:

  • Peak cyclosporine A concentration (Cmax) is a more suitable measure of drug exposure than trough concentration (Cmin) in pediatric kidney transplant patients.
  • Age influences the time to reach peak CSA levels, which can inform blood sampling strategies.
  • Further research may refine age-based predictions for optimal CSA monitoring in children.

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