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Related Experiment Videos

Induction of anesthesia with halothane increases plasma norepinephrine concentrations

J T Joyce, M F Roizen, J I Gerson

    Anesthesiology
    |April 1, 1982
    PubMed
    Summary

    Anesthesia induction with halothane, with or without nitrous oxide, temporarily elevates plasma norepinephrine. This effect appears linked to halothane

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    Area of Science:

    • Anesthesiology
    • Pharmacology
    • Neuroscience

    Background:

    • Understanding the physiological effects of anesthetic agents is crucial for patient safety.
    • Norepinephrine plays a key role in the sympathetic nervous system's response to stress.

    Purpose of the Study:

    • To investigate the impact of halothane and nitrous oxide on plasma norepinephrine levels during anesthesia induction.
    • To determine if observed changes correlate with cardiovascular variables.

    Main Methods:

    • Plasma norepinephrine concentrations were measured in unstimulated, unmedicated patients receiving halothane/O2 or halothane/nitrous oxide.
    • An isolated cat spleen perfusion model was used to assess direct effects of halothane on norepinephrine release.

    Main Results:

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    • Halothane/O2 administration increased plasma norepinephrine levels during induction, returning to baseline within 45-60 minutes.
    • Halothane and nitrous oxide also elevated norepinephrine, independent of face mask application.
    • No correlation was found between norepinephrine changes and cardiovascular variables in human studies.
    • Halothane perfusion of isolated cat spleens increased norepinephrine release.

    Conclusions:

    • Halothane, alone or with nitrous oxide, initially increases plasma norepinephrine during anesthesia induction.
    • This effect is likely mediated by halothane acting on sympathetic nerve endings, not by the face mask.