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[Pharmacodynamics of propofol in children and adults: comparison based on the auditory evoked potentials index]

L I Cortínez1, H R Muñoz, R López

  • 1Departamento de Anestesiología, Escuela de Medicina, Pontificia Universidad Católica de Chile, Santiago de Chile. licorti@med.puc.cl

Revista Espanola De Anestesiologia Y Reanimacion
|July 11, 2006
PubMed

Insights

Children require higher doses of propofol for anesthesia induction due to increased sensitivity. This study compared propofol

Area of Science:

  • Anesthesiology
  • Pharmacology
  • Pediatric Medicine

Background:

  • Clinically effective propofol concentrations for inducing unconsciousness in children are not well-established.
  • Current target-controlled infusion systems often use adult parameters, potentially leading to inadequate hypnosis in pediatric patients.
  • Understanding pediatric propofol dosing is crucial for safe and effective anesthesia.

Purpose of the Study:

  • To investigate the dose-response relationship of propofol in children compared to adults.
  • To compare predicted effect-site concentrations (Ce) with measured hypnosis levels using auditory evoked potentials.
  • To evaluate the accuracy of existing pharmacokinetic models for pediatric propofol administration.

Main Methods:

  • Auditory evoked potential index was measured in 25 children (3-11 years) and 25 adults (35-48 years) after propofol bolus.
  • Predicted propofol effect-site concentration (Ce) was calculated using patient-specific ke0 and adult/pediatric pharmacokinetic models.
  • Sigmoid Emax model in NONMEM analyzed the Ce-hypnosis relationship.

Main Results:

  • Mean propofol doses were 1.6 mg/kg in adults and 2.7 mg/kg in children.
  • The Ce associated with 50% maximal effect (Ce50) was significantly higher in adults (6.45 µg/mL) than estimated for children (2.06 µg/mL with Kataria model, 3.56 µg/mL with Paedfusor model).
  • These findings indicate a higher sensitivity to propofol in children.

Conclusions:

  • Children exhibit greater sensitivity to propofol compared to adults.
  • Observed higher propofol dose requirements in children are likely due to pharmacokinetic differences.
  • This study highlights the need for pediatric-specific dosing parameters in target-controlled infusion systems.
Abstract

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