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Electroencephalographic abnormalities following halothane anesthesia.

K J Bruchiel, J J Stockard, R K Calverley

    Anesthesia and Analgesia
    |March 1, 1978
    PubMed
    Summary
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    Psychological impairment after halothane anesthesia resolved within two weeks. Electroencephalogram changes persisted longer, suggesting unchanged halothane, not bromide, caused the impairment.

    Area of Science:

    • Anesthesiology
    • Neuroscience
    • Clinical Psychology

    Background:

    • Halothane is a common anesthetic agent.
    • Postanesthetic cognitive and electroencephalographic (EEG) changes are a concern.
    • The role of bromide metabolites versus unchanged halothane in these changes requires clarification.

    Purpose of the Study:

    • To investigate the duration and nature of psychological and EEG changes following halothane anesthesia.
    • To assess the contribution of serum bromide levels to postanesthetic effects.

    Main Methods:

    • Serial EEGs, serum bromide levels, and psychological tests were performed on 7 subjects before and after halothane anesthesia.
    • Data were collected at various time points post-anesthesia.

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    Main Results:

    • Psychological impairment was noted 2 days post-anesthesia but absent at 2 weeks.
    • EEG showed nonspecific slowing, more pronounced than with enflurane, persisting for 6-8 days.
    • EEG changes included generalized slowing, posterior delta activity, and reduced alpha rhythm.
    • Rare sharp-wave activity occurred in 3 subjects.
    • Serum bromide levels were elevated but not indicative of intoxication.
    • EEG changes were not consistent with bromide intoxication.

    Conclusions:

    • Psychological impairment following halothane anesthesia is likely due to persistent unchanged halothane, not bromide metabolites.
    • EEG abnormalities indicate a longer recovery period than psychological deficits suggest.
    • Further research into anesthetic metabolite effects on neurocognitive function is warranted.