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Pharmacodynamic modelling of the bispectral index response to propofol-based anaesthesia during general surgery in

C Jeleazcov1, H Ihmsen, J Schmidt

  • 1Department of Anaesthesiology, Universitätsklinikum Erlangen, Friedrich-Alexander-Universität Erlangen-Nürnberg, Krankenhausstr. 12, 91054 Erlangen, Germany. christian.jeleazcov@kfa.imed.uni-erlangen.de

British Journal of Anaesthesia
|February 14, 2008
PubMed

Insights

This study developed a pharmacodynamic model for pediatric anesthesia, showing the Bispectral Index (BIS) accurately reflects anesthetic drug effects. Propofol

Area of Science:

  • Pharmacology
  • Anesthesiology
  • Pediatric Medicine

Background:

  • General anesthesia in children requires precise monitoring of anesthetic drug effects.
  • The Bispectral Index (BIS) is a common tool, but its pharmacodynamic modeling in pediatric populations needs further elucidation.
  • Understanding the interplay of propofol, fentanyl, and remifentanil is crucial for optimizing pediatric anesthesia.

Purpose of the Study:

  • To develop a pharmacodynamic model relating BIS response to propofol, fentanyl, and remifentanil dosing in children.
  • To evaluate the age-dependency of anesthetic drug pharmacodynamics in pediatric patients.
  • To assess the predictive capability of BIS for anesthetic drug effect.

Main Methods:

  • Collected BIS, heart rate, mean arterial pressure, sedation scores, and anesthetic protocols from 59 children (1-16 years).
  • Utilized a sigmoid model with additive interaction to fit BIS as the effect variable.
  • Estimated pharmacodynamic parameters using non-linear regression and quantified BIS predictive ability with prediction probability (Pk).

Main Results:

  • BIS values demonstrated a clear response to anesthetic induction and maintenance.
  • BIS accurately predicted anesthetic drug effect with a Pk of 0.79.
  • Propofol's effect equilibration half-time (k(e0)) was age-dependent, decreasing with age, while fentanyl and remifentanil pharmacodynamics resembled adult profiles.

Conclusions:

  • The effect equilibration half-time of propofol in children is significantly influenced by age.
  • Fentanyl and remifentanil exhibit similar pharmacodynamics in children and adults.
  • BIS closely correlates with modeled effect-site concentrations, validating its use for monitoring anesthetic drug effects in children over 1 year old.
Abstract

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