37. Automatic detection of dominant rhythm and slow wave with short duration in automatic EEG interpretation system

electoromyograms (EMGs) were simultaneously recorded from the bilateral deltoid muscles. In each ictal event, artifact-free segment of 5 s before and after EMG onset of spasm was selected to analyze the power spectrum by multiple band frequency analysis (MBFA). Each power spectrum of spasms in a series was averaged by triggering EMGs. Ictal 45–110 Hz HFOs preceding each PSs were captured in all patients, and they presented over the area around the lesions on MRI. The resection of the lesion including the area of HFOs stopped PSs in one patient. Incomplete resection of area of ictal HFOs in the other 2 patients remained PSs. The area of ictal HFOs by averaging on scalp EEG during PSs represented the epileptogenic zone.