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Related Experiment Videos

Monitoring optic nerve function during craniotomy.

M Feinsod, J B Selhorst, W F Hoyt

    Journal of Neurosurgery
    |January 1, 1976
    PubMed
    Summary

    Monitoring visual evoked responses (VER) during pituitary adenoma surgery showed that decompression of optic nerves restored normal vision. This technique helps assess visual pathway function in real-time during neurosurgery.

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    Area of Science:

    • Neurosurgery
    • Ophthalmology
    • Neurophysiology

    Background:

    • Pituitary adenomas can compress the anterior visual pathways, leading to vision loss.
    • Monitoring visual pathway function during surgery is crucial for preventing permanent visual deficits.

    Purpose of the Study:

    • To assess the utility of continuous visual evoked response (VER) monitoring during surgical removal of pituitary adenomas.
    • To correlate VER changes with intraoperative optic nerve decompression and postoperative visual recovery.

    Main Methods:

    • Utilized a scleral contact lens with an embedded flashing diode to deliver visual stimuli.
    • Continuously recorded visual evoked responses (VER) from occipital scalp electrodes.
    • Monitored VER latency, amplitude, and form during pituitary adenoma resection.

    Main Results:

    • Immediately after optic nerve decompression, VERs with near-normal latency, amplitude, and form were recorded.
    • Restoration of VER parameters correlated significantly with the restoration of normal vision.

    Conclusions:

    • Continuous VER monitoring is an effective method for assessing visual pathway integrity during pituitary adenoma surgery.
    • Intraoperative VER monitoring can guide surgical decisions and predict visual outcomes, aiding in the prevention of vision loss.

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