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Related Concept Videos

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The one-compartment model is a pharmacokinetic tool that models the body as a single, uniform compartment, facilitating the understanding of drug distribution and elimination. This model is particularly beneficial for intravenous (IV) bolus administration, where the drug rapidly circulates throughout the body.
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Intravenous anesthetics are drugs administered parenterally to induce anesthesia or sedation. Propofol is a widely used agent formulated as a 1% emulsion in soybean oil, glycerol, and egg phosphatide. It induces rapid anesthesia primarily due to its rapid distribution from the bloodstream to target tissues and is metabolized in the liver. However, it can cause significant pain on injection and hypertriglyceridemia. Fospropofol, a water-based prodrug of propofol, lacks these adverse effects.
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Intravenous (IV) infusion is often utilized when continuous and controlled drug delivery is necessary, such as during surgery or in the treatment of chronic diseases. This method offers numerous advantages, including immediate drug action, precise control over dosage, and bypassing the first-pass metabolism.
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General purpose propofol target-controlled infusion using the marsh model with adjusted weight input.

George Zhong1, Xiabing Xu2

  • 1Department of Anaesthesia, Concord Repatriation General Hospital, Hospital Road, Concord, NSW, 2139, Australia. drgzhong@gmail.com.

Journal of Anesthesia
|February 11, 2024
PubMed
Summary

A new weight adjustment method enhances the Marsh target-controlled infusion (TCI) model for propofol. This improves precision for elderly and underweight patients, closely matching the Eleveld model

Keywords:
EleveldMarshPropofolTarget-controlled infusion

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Area of Science:

  • Anesthesiology
  • Pharmacokinetics
  • Medical Informatics

Background:

  • Target-controlled infusion (TCI) models are crucial for precise anesthetic drug delivery.
  • The Marsh TCI model has limitations in accuracy for patients at the extremes of age and body mass index.
  • The Eleveld model offers improved accuracy but is not yet widely implemented.

Purpose of the Study:

  • To develop and validate a simple weight adjustment method for the Marsh TCI model.
  • To enhance the precision of the Marsh model, particularly for pediatric and geriatric populations.
  • To enable the Marsh model to closely mimic the performance of the Eleveld model.

Main Methods:

  • A novel weight adjustment algorithm was applied to the Marsh TCI model.
  • Simulations were conducted on 2768 virtual subjects with varied demographics (age, weight, height, sex).
  • The performance of the weight-adjusted Marsh model was compared against the Eleveld model using propofol TCI simulations.

Main Results:

  • The weight-adjusted Marsh model demonstrated infusion regimes and effect-site concentrations highly similar to the Eleveld model.
  • Median absolute performance error was below 8.1%, and maximum absolute performance error was below 20.3% across all simulated subjects.
  • The method proved effective in improving the Marsh model's precision for diverse patient populations.

Conclusions:

  • The proposed weight adjustment method offers a simple and robust enhancement for the Marsh TCI model.
  • This modification significantly improves the Marsh model's accuracy for patients at the extremes of age and body mass index.
  • The adjusted Marsh model serves as a valuable alternative until more advanced TCI models are commercially available.