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Predicting concentrations in children presenting with acetaminophen overdose.

B J Anderson1, N H Holford, J C Armishaw

  • 1Department of PICU, Auckland Children's Hospital, Park Road, Grafton, Auckland, New Zealand.

The Journal of Pediatrics
|September 15, 1999
PubMed
Summary
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For children aged 1-5 years with acetaminophen elixir overdose, measuring serum concentrations at 2 hours post-ingestion, not 4 hours, is recommended. Enteral charcoal is ineffective after one hour.

Area of Science:

  • Pediatric toxicology
  • Pharmacokinetics
  • Clinical pharmacology

Background:

  • Accidental acetaminophen ingestion in children requires accurate toxicity assessment.
  • Current guidelines for monitoring acetaminophen toxicity may not be optimal for young children.

Purpose of the Study:

  • To predict serum acetaminophen concentrations in children (1-5 years) following accidental ingestion.
  • To evaluate and potentially improve existing treatment guidelines for pediatric acetaminophen overdose.

Main Methods:

  • Pharmacokinetic modeling was used to simulate acetaminophen concentrations in 1000 children.
  • Simulations considered a 300 mg/kg dose and age-specific variability.
  • Predicted concentrations were validated against data from 121 children with accidental ingestion.

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Main Results:

  • Simulations predicted a 300 mg/kg dose would yield 32-208 mg/L (95% CI) at 4 hours.
  • Maximum acetaminophen concentrations typically occurred before 2 hours in simulated pediatric cases.
  • Enteral charcoal administration >90 minutes post-ingestion showed no significant impact on serum levels.

Conclusions:

  • For children (1-5 years) ingesting >250 mg/kg acetaminophen, serum concentration measurement at 2 hours is advised over the adult 4-hour recommendation.
  • This earlier measurement can expedite patient discharge and reduce parental anxiety.
  • Enteral charcoal is only effective if administered within one hour of acetaminophen ingestion.