Summary
A significant increase in the knowledge base in paediatric clinical pharmacology has occurred over the past 2 decades and has largely been the result of important scientific and sociological advancements pertaining to paediatric therapeutics. Although the data on drug disposition in infants and children have increased considerably over the past few years, pharmacokinetic-pharmacodynamic interactions, particularly the effect of development on pharmacodynamics, remain poorly understood.
The impact of developmental physiology on drug absorption, distribution, metabolism and elimination in infants and children is reviewed and contrasted to the determinants of clinical pharmacokinetics in neonates. The most notable differences in drug disposition between infants and children when compared with neonates and young adults centre around alterations in body water and serum protein composition and the affinity/capacity for hepatic biotransformation of xenobiotics.
As opposed to examining the effect of age on the disposition of specific compounds, the differences in developmental pharmacology are highlighted by the review of important and/or emerging pharmacokinetic-pharmacodynamic controversies in infants and children. These include the issues of altered drug distribution and metabolism in cystic fibrosis, pharmacokinetic determinants of successful antimicrobial therapy in bacterial meningitis and the pharmacokinetic determinants of immunosuppression treatment with cyclosporin. The pharmacological differences which are characteristic of development in both infants and children are also reviewed by examination of considerations for clinical pharmacokinetic evaluations such as specific routes and techniques for both drug administration and determination of sampling strategies.
Clinical pharmacokinetics will continue to function as a bridge between the generation of new information and the practical application of this knowledge. Consequently, pharmacokinetics provides a pharmacological tool for use in research and clinical care. The clinical application of this tool is examined by a review of the pertinent assumptions and limitations, as well as useful mathematical techniques for use in paediatric patients. Additionally, ‘non-traditional’ uses of clinical pharmacokinetics (forensic application and use to evaluate organ function) in infants and children are discussed as are considerations for research use of clinical pharmacokinetic data.
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Kearns, G.L., Reed, M.D. Clinical Pharmacokinetics in Infants and Children. Clin-Pharmacokinet 17 (Suppl 1), 29–67 (1989). https://doi.org/10.2165/00003088-198900171-00005
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DOI: https://doi.org/10.2165/00003088-198900171-00005