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Pharmacokinetics of propofol in children
R D Jones1, K Chan, L J Andrew
1Department of Anaesthesiology, Queen Mary Hospital, Hong Kong.
Insights
Propofol pharmacokinetics in children show rapid distribution to shallow compartments. Elimination half-life averaged 209 minutes, indicating slower drug clearance in this pediatric population.
Area of Science:
- Pharmacology
- Pediatric Anesthesiology
Background:
- Propofol is a widely used anesthetic agent.
- Understanding its pharmacokinetics in pediatric populations is crucial for safe and effective anesthesia.
- Limited data exists on propofol pharmacokinetics in healthy Chinese children.
Purpose of the Study:
- To investigate the pharmacokinetic profile of propofol in healthy Chinese children undergoing circumcision.
- To determine key pharmacokinetic parameters such as elimination half-life, clearance, and volume of distribution.
Main Methods:
- A single intravenous bolus dose of propofol (2.5 mg kg-1) was administered to 12 healthy Chinese children (aged 4-12 years).
- Blood propofol concentrations were measured over 24 hours using high-performance liquid chromatography with fluorimetric detection.
- Pharmacokinetic data were analyzed using a three-compartment model.
Main Results:
- The mean elimination half-life was 209 (29) min, and total body clearance was 40.4 (3.6) ml min-1 kg-1.
- The mean apparent volume of distribution at steady state was 5.0 (2.7) L kg-1.
- Rapid distribution to a shallow compartment and constrained return to the central compartment due to lipophilicity were observed.
Conclusions:
- Propofol exhibits a three-compartment pharmacokinetic model in healthy Chinese children.
- The drug distributes rapidly to peripheral compartments, with lipophilicity influencing its redistribution.
- These findings contribute to optimizing propofol dosing strategies in pediatric anesthesia.
Abstract:
The pharmacokinetics of propofol were studied in 12 healthy Chinese children, aged 4-12 yr, undergoing circumcision under inhalation anaesthesia. All patients received a single i.v. bolus dose of propofol 2.5 mg kg-1 and blood concentrations of propofol over the subsequent 24 h were measured using high pressure liquid chromatography with fluorimetric detection. Data were consistent with a three-compartment model with a mean (SEM) elimination half-life of 209 (29) min and total body clearance of 40.4 (3.6) ml min-1 kg-1. The mean (SEM) apparent volume of distribution at steady state was 5.0 (2.7) litre kg-1 and volume of the central compartment was 0.6 (0.1) litre kg-1. The mean (SEM) ratio of k12:k21 was 1.4 (0.2), suggesting that, after injection of a single bolus dose in children, propofol is distributed rapidly to the shallow compartment. The mean ratio of k31:k10 suggests that lipophilicity constrains return of the drug to the central compartment.