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Gentamicin and tobramycin Kinetics

G W Counts, A D Blair, K F Wagner

    Clinical Pharmacology and Therapeutics
    |May 1, 1982
    PubMed
    Summary
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    Gentamicin and tobramycin serum levels showed similar mean peaks, but gentamicin achieved higher therapeutic levels more often. Ideal body weight best predicted aminoglycoside levels, with deviations in specific patient groups.

    Area of Science:

    • Pharmacology
    • Nephrology
    • Infectious Diseases

    Background:

    • Aminoglycosides like gentamicin and tobramycin are crucial antibiotics.
    • Accurate therapeutic drug monitoring is essential for efficacy and safety.
    • Predicting serum aminoglycoside levels can be challenging in hospitalized patients.

    Purpose of the Study:

    • To compare the predictability of gentamicin and tobramycin serum levels.
    • To evaluate factors influencing aminoglycoside serum level prediction.
    • To determine the most accurate method for predicting aminoglycoside levels.

    Main Methods:

    • Randomized trial of 82 hospitalized adult patients receiving gentamicin or tobramycin.
    • Comparison of actual serum drug levels with computer-derived predicted levels.

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  • Analysis of factors including body weight, ascites, pneumonia, and concomitant therapies.

    • Main Results:

    • Mean peak serum levels for gentamicin and tobramycin were comparable (4.87 vs. 4.31 µg/mL).
    • Higher percentage of patients achieved peak levels > 4.0 µg/mL with gentamicin (73% vs. 46%).
    • Predicted levels were less accurate in patients with lower actual body weight, ascites, carbenicillin therapy, or pneumonia.

    Conclusions:

    • Ideal body weight is the most reliable predictor for aminoglycoside serum levels.
    • Deviations in predicted vs. measured levels are significant when using actual body weight or surface area for calculations.
    • Clinical factors like ascites and pneumonia impact aminoglycoside pharmacokinetics.