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Model-based administration of inhalation anaesthesia. 3. Validating the system model.

J G C Lerou1, L H D J Booij

  • 1Institute for Anaesthesiology, University of Nijmegen, The Netherlands.

British Journal of Anaesthesia
|March 9, 2002
PubMed
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This study validated a computer model for inhalation anesthesia delivery. Version 2 of the model demonstrated good predictive performance, supporting its use with active patient monitoring.

Area of Science:

  • Anesthesiology
  • Medical Informatics
  • Pharmacokinetics

Background:

  • Quantified predictive performance of a computer model for inhalation anesthesia administration.
  • Utilized a Datex-Ohmeda Modulus CD circle-absorber system for data collection.

Purpose of the Study:

  • To evaluate the predictive accuracy of a computer model for inhalation anesthesia.
  • To compare two versions of the model differing in inter-tissue diffusion parameters.

Main Methods:

  • In 50 patients, desflurane anesthesia was maintained with low fresh-gas flow (FGF).
  • Two model versions were tested, differing in visceral to adipose tissue blood flow ratio (0% vs. 3%).
  • Model performance assessed by root mean squared error, bias, and scatter of predicted vs. measured gas concentrations.

Related Experiment Videos

Main Results:

  • Model predictions showed reasonable to very good agreement with clinical data.
  • Version 2 of the model outperformed version 1.
  • Model accuracy was better during maintenance (stage 2) than induction (stage 1), particularly for desflurane.

Conclusions:

  • Version 2 of the computer model is suitable for guiding inhalation anesthesia administration.
  • Active patient monitoring remains essential when using this model.