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Evoked potentials during isoflurane anaesthesia.

P S Sebel, D A Ingram, P J Flynn

    British Journal of Anaesthesia
    |June 1, 1986
    PubMed
    Summary
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    Increasing isoflurane anesthesia concentrations prolonged latencies and reduced amplitudes in somatosensory, visual, and brainstem auditory evoked potentials. These changes may indicate anesthetic depth.

    Area of Science:

    • Neuroscience
    • Anesthesiology

    Background:

    • Isoflurane is a common anesthetic agent.
    • Understanding its neurophysiological effects is crucial for patient safety.
    • Evoked potentials (EPs) are sensitive to anesthetic agents.

    Purpose of the Study:

    • To investigate the effects of varying isoflurane concentrations on somatosensory, visual, and brainstem auditory evoked potentials.
    • To assess the potential of EPs as a neurophysiological indicator of anesthetic depth.

    Main Methods:

    • Recorded somatosensory (N20), visual, and brainstem auditory evoked potentials (BAEPs) in 10 patients.
    • Administered isoflurane in oxygen at end-tidal concentrations of 0.5%, 1.1%, and 1.65% (in six patients).

    Main Results:

    Related Experiment Videos

    • Statistically significant increases in latencies for N20, visual EPs, and BAEP waves III and V with increasing isoflurane.
    • Prolonged central conduction time observed.
    • Reduced amplitudes for somatosensory and visual EPs at higher isoflurane concentrations.

    Conclusions:

    • Isoflurane significantly alters evoked potential parameters, including latency and amplitude.
    • Observed effects are comparable to those of halothane and enflurane.
    • Evoked potential measurements show promise as a neurophysiological index for monitoring anesthetic depth.