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Related Experiment Videos

Threshold hypnotic concentration of methohexitone.

P M Lauven1, H Schwilden, H Stoeckel

  • 1Institut für Anästhesiologie, Rheinischen Friedrich-Wilhelms-Universität, Bonn, Federal Republic of Germany.

European Journal of Clinical Pharmacology
|January 1, 1987
PubMed
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Methohexitone, used for anesthesia, showed consistent plasma concentrations across three infusion cycles in healthy volunteers. This indicates no acute tolerance, supporting its therapeutic window for inducing sleep and EEG burst suppression.

Area of Science:

  • Anesthesiology
  • Pharmacokinetics
  • Neuroscience

Background:

  • Methohexitone is an anesthetic agent.
  • Understanding its pharmacokinetic profile and therapeutic window is crucial for safe and effective clinical use.
  • Acute tolerance can affect anesthetic drug efficacy.

Purpose of the Study:

  • To determine the plasma concentrations of methohexitone at various endpoints of anesthesia.
  • To evaluate the presence of acute tolerance during repeated infusions of methohexitone.
  • To establish the therapeutic window of methohexitone based on clinical and electroencephalogram (EEG) parameters.

Main Methods:

  • Eight healthy adult volunteers received microprocessor-controlled infusions of methohexitone.
  • Plasma levels were monitored during three cycles of increasing concentrations.

Related Experiment Videos

  • EEG, eye lid reflex, corneal reflex, and orientation were assessed to determine anesthetic endpoints.

    • Main Results:

    • Mean venous plasma concentrations were: 3.39 µg/ml for sleep, 4.42 µg/ml for eye lid reflex loss, 6.51 µg/ml for corneal reflex loss, and 10.7 µg/ml for EEG burst suppression appearance.
    • No significant increase in threshold concentrations was observed across the three infusion cycles, indicating no acute tolerance.
    • The therapeutic window for methohexitone, based on sleep induction and EEG burst suppression, ranged from 3.4 to 10.7 µg/ml.

    Conclusions:

    • Methohexitone demonstrated a stable pharmacokinetic profile without significant acute tolerance in healthy volunteers.
    • The established therapeutic window provides valuable data for methohexitone's clinical application in anesthesia.
    • These findings support the use of methohexitone for inducing anesthesia and achieving EEG-monitored endpoints.