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Related Experiment Videos

Increased sensitivity to etomidate in the elderly: initial distribution versus altered brain response.

J R Arden, F O Holley, D R Stanski

    Anesthesiology
    |July 1, 1986
    PubMed
    Summary

    Aging significantly reduces the required dose of etomidate, an anesthetic. This is due to age-related pharmacokinetic changes, not increased brain sensitivity in older adults.

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    Area of Science:

    • Anesthesiology
    • Gerontology
    • Pharmacology

    Background:

    • Aging influences drug pharmacokinetics and pharmacodynamics.
    • Etomidate is an anesthetic agent used in surgical settings.

    Purpose of the Study:

    • To investigate the impact of aging on the pharmacokinetics and pharmacodynamics of etomidate.
    • To identify age-related factors influencing etomidate dosage requirements.

    Main Methods:

    • Intravenous infusion of etomidate (5-10 mg/min) in 21 healthy surgical patients (age 22-82).
    • Electroencephalogram (EEG) monitoring to determine dosage endpoint (stage 3 slowing).
    • Power-spectrum analysis of EEG for median frequency and sigmoid Emax modeling.

    Main Results:

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    • Etomidate dose requirement decreased significantly with increasing age.
    • No correlation found between age and pharmacodynamic model parameters (e.g., IC50).
    • Initial distribution volume and etomidate clearance decreased significantly with age.

    Conclusions:

    • Age-dependent pharmacokinetic changes, specifically reduced initial distribution volume and clearance, explain the lower etomidate dose requirement in the elderly.
    • Altered brain responsiveness is not the primary cause of age-related changes in etomidate dosage.