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Umbilical versus peripheral tobramycin administration.

R R Maddox, D M Purohit, M G Williams

    Therapeutic Drug Monitoring
    |January 1, 1986
    PubMed
    Summary
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    This study examined tobramycin (T) in premature neonates, finding that drug clearance varied significantly. Monitoring T concentrations is crucial for safe and effective neonatal therapy.

    Area of Science:

    • Pharmacokinetics
    • Neonatal Medicine
    • Antibiotic Therapy

    Background:

    • Tobramycin is frequently used in neonates.
    • Understanding its disposition is vital for safe dosing.
    • Premature neonates present unique pharmacokinetic challenges.

    Purpose of the Study:

    • To evaluate the pharmacokinetic disposition of tobramycin in premature neonates.
    • To assess tobramycin's distribution and elimination after different administration routes.
    • To determine the impact of therapy duration on tobramycin clearance.

    Main Methods:

    • A pharmacokinetic study involving 12 premature neonates.
    • Tobramycin administered via umbilical artery catheter, intravenous, and intramuscular routes.
    • Blood samples collected to analyze tobramycin concentrations over time.

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  • Data analyzed using a two-compartment model.

    • Main Results:

    • Tobramycin exhibited biphasic distribution requiring a two-compartment model.
    • Mean elimination half-life (t1/2 beta) was 11.18 hours.
    • Drug clearance (ClT) increased during therapy, correlating with improved renal function.
    • 50% of patients had tobramycin concentrations outside the therapeutic range.

    Conclusions:

    • Neonatal tobramycin pharmacokinetics are highly variable.
    • Increased drug clearance during therapy necessitates careful monitoring.
    • Therapeutic drug monitoring of tobramycin is essential for optimizing neonatal treatment.
    • Individualized dosing strategies are required for safe and effective tobramycin use in neonates.