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Continuous sampling as a pharmacokinetic tool

B Vogelstein, A A Kowarski, P S Lietman

    Clinical Pharmacology and Therapeutics
    |August 1, 1977
    PubMed
    Summary
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    Continuous blood sampling offers accurate pharmacokinetic analysis, determining drug clearance, volume of distribution, and half-life. This method provides advantages over traditional intermittent sampling for drug studies.

    Area of Science:

    • Pharmacology
    • Clinical Chemistry
    • Biomedical Engineering

    Background:

    • Traditional pharmacokinetic studies rely on intermittent blood sampling, which can be less accurate for determining key parameters.
    • Accurate determination of drug concentration-time profiles is crucial for understanding drug disposition and efficacy.
    • Continuous sampling (CS) offers a potential improvement for real-time pharmacokinetic monitoring.

    Purpose of the Study:

    • To present continuous sampling (CS) as a method for determining pharmacokinetic parameters.
    • To describe the theoretical background and practical application of CS in a clinical setting.
    • To demonstrate the utility of CS using the aminoglycoside antibiotic amikacin in pediatric patients.

    Main Methods:

    • Developed and described the theoretical basis for continuous blood sampling.

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  • Formulated a practical approach for implementing CS in clinical practice.
  • Administered amikacin to 6 pediatric patients and utilized CS for data acquisition.

    • Main Results:

    • CS accurately determined total area under the plasma concentration curve (AUC).
    • Key pharmacokinetic parameters including plasma and kidney clearance, volume of distribution, and half-life were precisely defined.
    • CS facilitated multicompartmental analysis through curve factorization.

    Conclusions:

    • Continuous sampling provides a more accurate and comprehensive method for pharmacokinetic analysis compared to intermittent sampling.
    • CS offers practical advantages such as model independence, reduced sampling requirements, and ease of sample collection.
    • This technique is valuable for detailed drug disposition studies, particularly in pediatric populations.