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P300 as a marker of cognitive dysfunction in chronic epileptics
N KuJan-Mar1, M Gupta1, M Sahay1
1G. B. Pant Hospital, Maulana Azad Medical College, New Delhi - 110 002, India.
Neurology India
|March 16, 2018
Summary
Subclinical cognitive dysfunction is common in epilepsy. P300 event-related potentials can help identify this impairment in patients with epilepsy.
Area of Science:
- Neuroscience
- Cognitive Psychology
Background:
- Epilepsy is a chronic neurological disorder.
- Subclinical cognitive impairment is often present in epilepsy patients.
- Standard neurological exams may not detect subtle cognitive deficits.
Purpose of the Study:
- To assess subclinical cognitive impairment in chronic epileptics.
- To investigate the utility of P300 event-related potentials as a marker for cognitive dysfunction.
- To explore correlations between P300 measures and clinical/neuropsychological data.
Main Methods:
- P300 event-related potentials were recorded using an 'oddball paradigm' in 23 chronic epilepsy patients and controls.
- Neuropsychological evaluations included Bender Gestalt, Bhatia Battery, and Wechsler Memory Scale.
- Patients had normal CT scans and Mini-Mental State Examination scores (≥25).
Main Results:
- Significantly increased P300 latency was observed in chronic epileptics compared to controls (P < 0.001).
- No significant relationship was found between P300 latency/amplitude and seizure onset, duration, or frequency.
- No association was identified between P300 latency and the assessed neuropsychological parameters.
Conclusions:
- Subclinical cognitive dysfunction is prevalent in individuals with chronic epilepsy.
- P300 event-related potential serves as a sensitive biomarker for detecting cognitive impairment in epilepsy.
- P300 latency alterations may reflect underlying cognitive processing deficits independent of seizure characteristics.
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