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Acetaminophen in cerebrospinal fluid in children

C D van der Marel1, B J Anderson, M A L Pluim

  • 1Department of Pediatric Surgery, Pediatric Surgical Intensive Care Unit, ErasmusMC-Sophia, Dr. Molenwaterplein 60, 3015 GJ Rotterdam, The Netherlands.

European Journal of Clinical Pharmacology
|July 8, 2003
PubMed

Insights

Acetaminophen (APAP) cerebrospinal fluid (CSF) equilibration half-time (Teq) in children is primarily determined by body size, not age-related blood-brain barrier maturation. This finding is crucial for optimizing pediatric pain management with APAP.

Area of Science:

  • Pediatric Pharmacology
  • Neuroscience
  • Drug Metabolism

Background:

  • Limited data exists on acetaminophen (APAP) cerebrospinal fluid (CSF) concentrations in pediatric populations.
  • Understanding APAP's plasma-to-CSF equilibration is vital for effective pain management in children.

Purpose of the Study:

  • To investigate age-related changes in the plasma to CSF equilibration half-time (Teq) of acetaminophen (APAP) in children.
  • To determine the influence of body size versus blood-brain barrier maturation on APAP Teq in pediatric patients.

Main Methods:

  • A loading dose of acetaminophen (30-40 mg/kg) was administered to 41 children (1 week to 18 years).
  • Blood and CSF samples were collected during surgery and postoperatively for APAP concentration analysis.
  • Pharmacokinetic analysis utilized non-linear mixed-effects models with allometric scaling for size standardization.

Main Results:

  • The population mean Teq, standardized to a 70-kg person, was 1.93 hours, similar to adult values.
  • No significant relationship was found between age and Teq, beyond what was predicted by body size.
  • APAP plasma concentrations ranged from 0.0 to 33.0 mg/L, and CSF concentrations ranged from 0.0 to 21.0 mg/L.

Conclusions:

  • Body size, rather than blood-brain barrier maturation, is the primary determinant of APAP Teq changes with age in children.
  • Predicted Teq values vary significantly with size, from 0.9 hours for a neonate (3.5 kg) to 1.93 hours for an adult (70 kg).
Abstract

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