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Related Experiment Videos

Changes in the electroretinogram and visual evoked potentials during general anaesthesia using enflurane

C Raitta, U Karhunen, A M Seppäläinen

    Graefe'S Archive for Clinical and Experimental Ophthalmology = Albrecht Von Graefes Archiv Fur Klinische Und Experimentelle Ophthalmologie
    |January 1, 1982
    PubMed
    Summary

    General anesthesia affects visual pathway function. Specifically, enflurane anesthesia delayed visual evoked potential (VEP) b-waves and late components, indicating altered cortical processing.

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    Area of Science:

    • Neuroscience
    • Ophthalmology
    • Anesthesiology

    Background:

    • Electrophysiological studies assess visual pathway function.
    • General anesthesia can alter neurological and physiological responses.

    Purpose of the Study:

    • To investigate the effects of general anesthesia on electroretinogram (ERG) and visual evoked potentials (VEP).
    • To determine if enflurane-based anesthesia impacts visual pathway function.

    Main Methods:

    • Studied 14 female patients before and during general anesthesia.
    • Recorded ERG and VEP using scalp and lower lid electrodes with averaging.
    • Utilized a thiopentone sodium, enflurane, and nitrous oxide anesthetic mixture.

    Main Results:

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    • Anesthesia delayed the VEP b-wave latency (P<0.01) and increased late component latencies (N180, P220).
    • VEP amplitudes of N60 and P130 decreased significantly during anesthesia (P<0.003).
    • ERG a-wave latency was unchanged, while b-wave latency increased.

    Conclusions:

    • General anesthesia, particularly enflurane, alters visual pathway function.
    • Changes in VEP components suggest a cortical site of action for enflurane.
    • Electrophysiological monitoring can detect anesthesia-induced visual pathway alterations.