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Related Experiment Videos

Pattern visual evoked potentials and brainstem auditory evoked responses in uremic patients

P A Rizzo, F Pierelli, G Pozzessere

    Acta Neurologica Belgica
    |March 1, 1982
    PubMed
    Summary

    Neurological complications in chronic renal failure patients can be detected early. Evoked potential recordings, like visual evoked potentials (VEPs) and brainstem auditory evoked responses (BAERs), show subtle central nervous system (CNS) changes before clinical symptoms appear.

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    Area of Science:

    • Neuroscience
    • Nephrology
    • Clinical Electrophysiology

    Background:

    • Chronic renal failure (CRF) and its treatment, dialysis, are associated with neurological complications.
    • Increased lifespan of uremic patients necessitates understanding long-term neurological effects.
    • Subtle central nervous system (CNS) changes may occur in CRF patients despite normal clinical examinations.

    Purpose of the Study:

    • To investigate the utility of electrophysiological tests in detecting early neurological damage in uremic patients.
    • To correlate evoked potential abnormalities with the status of chronic renal failure.

    Main Methods:

    • Electroencephalogram (EEG), pattern visual evoked potentials (VEPs), and brainstem auditory evoked responses (BAERs) were recorded.
    • Twelve uremic patients with normal neurological and psychiatric examinations were studied.

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  • Analysis focused on latency changes in VEPs and BAERs.

    • Main Results:

    • Pathological latency increases were observed in VEPs for 6 out of 12 patients.
    • Pathological latency increases were observed in BAERs for 3 out of 12 patients.
    • These electrophysiological abnormalities were detected in patients with clinically normal neurological exams.

    Conclusions:

    • Evoked potential recordings (VEPs and BAERs) may serve as sensitive indicators of early CNS lesions in uremic patients.
    • Findings suggest the presence of toxic substances or minimal demyelinating lesions affecting the CNS.
    • Electrophysiological monitoring can identify subclinical neurological deficits in chronic renal failure.