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Ictal neocortical slowing in temporal lobe epilepsy
H Blumenfeld1, M Rivera, K A McNally
1Department of Neurology and Neurobiology, Yale University School of Medicine, New Haven, CT, USA. hal.blumenfeld@yale.edu
Neurology
|September 29, 2004
Summary
Temporal lobe epilepsy (TLE) seizures disrupt brain function beyond the temporal lobe. This study found widespread slowing in frontal and parietal areas during TLE seizures, indicating broader neurological impairment.
Area of Science:
- Epilepsy research
- Neurophysiology
- Clinical neurology
Background:
- Temporal lobe epilepsy (TLE) can impact neocortical function beyond the temporal lobe during seizures.
- Understanding these extratemporal effects is crucial for comprehending TLE's full clinical impact.
Purpose of the Study:
- To investigate neocortical EEG patterns during seizures in patients with mesial TLE.
- To determine if seizure activity in the temporal lobe affects distant cortical regions.
Main Methods:
- Analysis of intracranial EEG from 11 mesial TLE patients post-temporal lobe resection.
- EEG data from 31 seizures were examined for specific patterns (e.g., LVF, slowing, suppression).
- Cortical regions were mapped using MRI, and EEG contacts were assigned accordingly.
Main Results:
- Seizures showed increased ictal patterns (LVF, polyspike) in the temporal lobe, followed by suppression.
- Significant irregular slowing was observed in bilateral frontal and ipsilateral parietal cortex during and after seizures.
- These frontoparietal changes persisted postictally, while perirolandic and occipital areas were less affected.
Conclusions:
- Widespread irregular slowing in frontoparietal association cortex is a key EEG feature during and after TLE seizures.
- This frontoparietal slowing suggests physiological impairment contributing to altered cerebral function in TLE.
- Findings highlight the extratemporal impact of temporal lobe seizures.