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Related Experiment Videos

Disposition kinetics of quinidine.

C T Ueda, D S Hirschfeld, M M Scheinman

    Clinical Pharmacology and Therapeutics
    |January 1, 1976
    PubMed
    Summary

    This study describes quinidine disposition kinetics in 12 patients, revealing significant interpatient variability. A two-compartment model explains quinidine

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    Area of Science:

    • Pharmacokinetics
    • Drug Metabolism
    • Clinical Pharmacology

    Background:

    • Understanding quinidine disposition is crucial for optimizing antiarrhythmic therapy.
    • Previous studies have indicated variability in quinidine pharmacokinetics.

    Purpose of the Study:

    • To characterize the disposition kinetics of quinidine in hospitalized patients initiating oral therapy.
    • To develop a pharmacokinetic model describing quinidine's absorption, distribution, and elimination.

    Main Methods:

    • Intravenous infusion of quinidine (2.6–5.2 mg/kg) in 12 patients.
    • Serial plasma sampling for 24 hours post-infusion.
    • Analysis using a specific and sensitive assay procedure and a two-compartment open model.

    Main Results:

    • Quinidine disposition followed a biexponential decay, best described by a two-compartment model.
    • Rapid distribution (t1/2alpha = 7.19 min) and a longer elimination half-life (t1/2beta = 6.33 hr).
    • High volume of distribution (Vdss = 3.03 L/kg) indicated predominantly extravascular distribution; clearance was mainly non-renal.

    Conclusions:

    • Quinidine exhibits significant interpatient variability in its disposition.
    • The proposed two-compartment model accurately describes quinidine pharmacokinetics.
    • Non-renal mechanisms are the primary route of quinidine elimination.

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