Modeling Anesthetic Gas Kinetics
Author Information
Author(s): Hendrickx Jan FA, Lemmens Hendrikus JM, Shafer Steven L
Primary Institution: Stanford University School of Medicine
Hypothesis
Can the kinetics of inhaled anesthetic agents be described by a classical compartmental model?
Conclusion
The kinetics of anesthetic gases can be adequately described by a mammilary compartmental model.
Supporting Evidence
- A three-compartment model fitted the data best with median prediction error (MDPE) = 0% and median absolute prediction error (MDAPE) ≤ 0.074%.
- The model performed equally well when tested prospectively with MDPE ≤ 0.51% and MDAPE ≤ 1.51%.
- The relationship between cardiac output and body weight and the distribution volumes and clearances is complex.
Takeaway
This study shows that we can use a special math model to understand how anesthetic gases work in the body, just like we do for other types of medicines.
Methodology
The study used computer simulations to generate concentration vs. time curves for different anesthetic agents and fitted compartmental models to the data.
Limitations
The study does not address when or whether to use physiological modeling or classical compartmental modeling.
Participant Demographics
Simulations were run for a 70 kg patient and for patients weighing 40, 55, 70, 85, and 100 kg.
Digital Object Identifier (DOI)
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