B-3. Electroencephalography and seizures learned from ictal recording

Experience on ictal video electroencephalography (EEG) recording enriches knowledge on EEG and seizures. Following five fundamentals are important for correct interpretation of EEG during focal epileptic seizures.Epileptic seizures never happen without EEG changes.Epileptic seizure propagates.EEG changes are not necessarily visible.EEG changes occur as a remote effect.EEG seizure explains clinical symptoms.Focal epileptic seizure starts with several patterns such as low voltage fast activity or repetitive spikes, followed by ictal rhythm that evolves spatially from focal to diffuse area, and temporally from low amplitude fast to high amplitude slow waves.

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