*5.3.3 Ictal EEG*

Epileptic discharges (ED) sequentially involve different areas of the brain, such as describing a random migration, without a specific pattern. The ictal pattern is characterized by rhythmic monomorphic activity in the alpha-theta frequency range, although delta waves, spikes, and spike-waves can also be observed. It is common for epileptic activity to remain limited to one region for a period of time and then decrease in frequency until stop, with a tendency to progressively involve an adjacent area. ED is continued with slow postictal activity without prolonged voltage decrement [63, 68]. When epileptic seizures are frequent, ED changes from one region to another and from one hemisphere to another so that consecutive focal epileptic discharges overlap resulting in a continuous and changing multifocal ictal activity and a very complex epileptic status pattern [11].
