Table 2: Characteristics of patients requiring invasive EEG monitoring.

Invasive EEG requiredInvasive EEG not required

Frequency1977
SelAH procedure 120
ATL procedure1857
Gender (%female) 9 (47%)45 (58%)
Age at surgery (Year) 37.240.9
Initial EEG lateralizing/localizing (%)9 (47%)47 (62%)
MRI concordance14 (72%)67 (87%)
Multifocal spikes in EMU*18 (95%)19 (25%)
Bilateral interictal abnormalities in EMU (%)*9 (47%) 13 (17%)
Average duration of seizure freedom (months)18.113.7

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EEG: electroencephalography; EMU: Epilepsy Monitoring Unit.