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[Late auditory evoked potentials in subcortical cognitive deterioration].

P Hautecoeur1, P Gallois, G Forzy

  • 1Service de Neurologie, CH Saint-Philibert, Lomme.

Revue Neurologique
|January 1, 1991
PubMed
Summary

Auditory evoked potentials (AEPs) reveal prolonged N 100 latency in parkinsonians with cognitive deterioration, suggesting it as a marker for subcortical dementia. P 300 latency was also extended in cognitive deterioration parkinsonians and Alzheimer's patients.

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Area of Science:

  • Neuroscience
  • Clinical Electrophysiology
  • Cognitive Neurology

Context:

  • Cognitive impairment is a significant feature in neurodegenerative diseases like Parkinson's disease and Alzheimer's disease.
  • Auditory evoked potentials (AEPs) offer a non-invasive method to assess auditory pathway function and cognitive processing.
  • Distinguishing between different types of dementia and their underlying pathophysiology is crucial for accurate diagnosis and management.

Purpose:

  • To investigate alterations in late auditory evoked potentials (AEPs), specifically P 300 and N 100 latencies, in patients with Parkinson's disease (PD) and disseminated sclerosis (DS).
  • To compare AEP findings in non-demented Parkinson's patients (NP), cognitively deteriorated Parkinson's patients (CDP), Alzheimer-type senile dementia (ATSD) patients, and disseminated sclerosis patients (DS) with controls.
  • To explore the potential of N 100 latency as an electrophysiological marker for subcortical dementia.

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Summary:

  • Late AEPs were recorded using the odd-ball method in Parkinson's disease (PD) and disseminated sclerosis (DS) patients, compared to controls and Alzheimer's disease (AD) patients.
  • Prolonged P 300 latency was observed in cognitively deteriorated Parkinson's patients (CDP) and Alzheimer-type senile dementia (ATSD) groups.
  • The N 100 latency was prolonged specifically in the CDP group and in both non-deteriorated (NDS) and deteriorated (DDS) disseminated sclerosis groups, indicating its potential as a marker for subcortical dementia.

Impact:

  • This study highlights the diagnostic utility of specific AEP components, particularly N 100 latency, in identifying subcortical dementia.
  • Findings contribute to understanding the electrophysiological underpinnings of cognitive decline in various neurological conditions.
  • The research may pave the way for earlier and more accurate diagnosis of dementia subtypes through objective electrophysiological measures.