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Morphine kinetics in children.

B Dahlström, P Bolme, H Feychting

    Clinical Pharmacology and Therapeutics
    |September 1, 1979
    PubMed
    Summary
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    Morphine

    Area of Science:

    • Pharmacology
    • Pediatric Anesthesiology
    • Pain Management

    Background:

    • Morphine is a common analgesic used in pediatric surgery.
    • Understanding morphine pharmacokinetics in children is crucial for safe and effective pain management.
    • Previous studies have shown variability in drug response among pediatric populations.

    Purpose of the Study:

    • To characterize the plasma kinetics of morphine in children aged 0 to 15 years.
    • To determine the minimum effective plasma concentration of morphine for pain control during surgery in children.
    • To assess age-related differences in morphine pharmacokinetics and efficacy.

    Main Methods:

    • Plasma samples were collected from pediatric patients (0-15 years) receiving morphine.
    • Morphine concentrations were analyzed using validated bioanalytical methods.

    Related Experiment Videos

  • Pharmacokinetic parameters were determined using triexponential modeling.
  • Minimum effective plasma concentrations were correlated with pain suppression.

    • Main Results:

    • Morphine plasma kinetics in children are generally described by a triexponential function.
    • Weight-based dosing resulted in minor age-related kinetic differences (0-15 years).
    • No significant kinetic differences were observed between pre-medication only and intra-operative dosing groups (7-15 years).
    • The minimum effective plasma morphine concentration to suppress pain was 65 ng/ml (95% CI: 46-83 ng/ml).
    • No significant age-related differences in morphine sensitivity or effective levels were found.
    • Anesthesiologist variability did not impact minimum effective morphine levels.

    Conclusions:

    • Morphine pharmacokinetics are predictable in children (0-15 years) with weight-based dosing.
    • A consistent minimum effective plasma morphine concentration exists for pediatric surgical pain.
    • Children of different ages exhibit similar sensitivity to morphine's analgesic effects.