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Quinidine dosage in children using population estimates.

G J Burckart, J Marin-Garcia

    Pediatric Cardiology
    |January 1, 1986
    PubMed
    Summary
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    Pediatric cardiac arrhythmia treatment with quinidine requires careful dosing adjustments. Dosing by body surface area is often excessive, while body weight dosing may be insufficient, necessitating individualized patient estimates for optimal therapeutic quinidine levels.

    Area of Science:

    • Pharmacology
    • Pediatric Cardiology
    • Clinical Pharmacy

    Background:

    • Cardiac arrhythmias in children require effective pharmacotherapy.
    • Quinidine is an antiarrhythmic medication used in pediatric patients.
    • Optimal dosing strategies for quinidine in children are not well-established.

    Purpose of the Study:

    • To identify factors influencing plasma quinidine concentrations in hospitalized pediatric patients.
    • To develop patient population estimates for predicting effective quinidine dosages.
    • To evaluate current dosing recommendations for quinidine in children.

    Main Methods:

    • Retrospective analysis of 36 plasma quinidine concentrations from nine pediatric patients.
    • Stepwise multilinear regression to assess factors affecting plasma concentration.

    Related Experiment Videos

  • Comparison of quinidine dosing and plasma levels based on body weight and body surface area.

    • Main Results:

    • Plasma quinidine concentration was significantly influenced by dose and time of blood draw, not patient age.
    • Six of eight responders achieved normal sinus rhythm below 2.0 micrograms/ml.
    • Concurrent digoxin use was associated with higher quinidine levels and shorter half-life.

    Conclusions:

    • Current quinidine dosing recommendations for children by body surface area are excessive.
    • Dosing by body weight may be insufficient; individualized estimates are crucial.
    • Patient population estimates aid in optimizing quinidine therapy for pediatric cardiac arrhythmias.