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Steady-state plasma fentanyl in the rabbit
British Journal of Anaesthesia
|December 1, 1981
Summary
This study developed pharmacokinetic models for fentanyl in rabbits to predict drug dosing. While initial models overestimated concentrations, refined models improved accuracy for achieving steady-state fentanyl levels, suggesting potential for broader applications.
Area of Science:
- Pharmacology
- Anesthesiology
- Pharmacokinetics
Background:
- Accurate prediction of drug concentrations is crucial for effective anesthesia.
- Fentanyl's pharmacokinetic behavior requires precise modeling for therapeutic efficacy.
Purpose of the Study:
- To develop and refine linear pharmacokinetic models for fentanyl in anesthetized rabbits.
- To predict and achieve rapid steady-state plasma concentrations of fentanyl.
- To investigate factors influencing fentanyl disposition, including lung uptake.
Main Methods:
- Development of composite pharmacokinetic models for fentanyl.
- In vivo testing in anesthetized rabbits to validate model predictions.
- Modification of models to account for intercompartmental differences and lung uptake.
Main Results:
- Initial models predicted lower-than-actual steady-state fentanyl concentrations.
- Refined models showed improved, though still slightly overestimated, fentanyl disposition.
- A 4-hour infusion aimed at 10 ng/mL yielded concentrations ranging from 8.7 to 18.0 ng/mL.
Conclusions:
- Pharmacokinetic modeling can rapidly achieve and maintain steady-state fentanyl concentrations.
- Lung uptake and intercompartmental mixing are significant factors in fentanyl disposition.
- The developed methods warrant further investigation for other drugs in both animal and human studies.