High density scalp EEG in frontal lobe epilepsy.

Area of Science:

• Neurology
• Epileptology
• Neurophysiology

Background:

• Frontal lobe epilepsy seizure localization is challenging due to rapid spread, artifacts, and limited resolution of conventional EEG.
• Accurate localization is crucial for effective treatment and surgical planning.

Purpose of the Study:

• To evaluate the diagnostic value of 76-channel high-density EEG (hdEEG) for seizure localization in suspected frontal lobe epilepsy.
• To compare hdEEG findings with MRI, SISCOM, conventional EEG, and intracranial EEG (iEEG).

Main Methods:

• Retrospective cohort study of 14 patients with suspected frontal lobe epilepsy undergoing hdEEG monitoring.
• iEEG served as the gold standard for seizure onset localization.
• Concordance analysis between hdEEG, conventional EEG, MRI, SISCOM, and iEEG was performed.

Main Results:

• hdEEG localization showed high concordance with iEEG (12/14 patients).
• hdEEG significantly outperformed conventional EEG (p<0.01) and SISCOM (p<0.01) in localization accuracy.
• hdEEG correctly lateralized seizure onset in all 14 cases, compared to 9/14 with conventional EEG (p=0.04).
• Five of seven surgically treated patients became seizure-free.

Conclusions:

• hdEEG monitoring is a valuable tool for localizing seizures in patients with suspected frontal lobe epilepsy.
• hdEEG can guide iEEG monitoring and enhance EEG source localization strategies.
• Improved localization through hdEEG may lead to better surgical outcomes.