S10-3. Involvement of EEG technologists in intracranial electroencephalography

Intracranial electroencephalography (iEEG) is highly invasive but is useful in epilepsy surgery to delineate the margins of an epileptogenic zone and to identify eloquent areas. The involvement of EEG technologists in iEEG varies depending on the institution in Japan. In our hospital, EEG technologists are involved in preparing, recording, and reviewing EEGs, and supporting patients and their family during iEEG. EEG technologists prepare the electroencephalograph setting and connect the intracranial electrodes to the electroencephalograph with the neurosurgeon on the day after implantation. They review the EEG just after the start of recording and observe all EEG data. They check the condition of the electrodes at least twice a day. EEG technologists also manage and review recording of scalp EEG simultaneously with iEEG in the second week of investigation. They check after-discharges during functional brain mapping by cortical electrical stimulation. They work closely together with the neurosurgeon and neurologist to ensure patient safety. EEG technologists are also expected to relieve the patient of physical and psychological burdens during iEEG recording. They provide adequate information about the examination to patients and family before implantation of the intracranial electrodes. They continue to support patients and their family during iEEG recording.