Clinical and Intracranial EEG Analysis of Pure Amnestic Seizures and Postictal Amnestic States in Two Patients with Temporal Lobe Epilepsy.

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In a patient with temporal lobe epilepsy, pure amnestic seizures (PAS) were documented by long-term intracranial EEG/VTR monitoring, and postictal amnestic states in another patient. Pure amnestie seizures consisting of anterograde amnesia with preserved cognitive functions occurred after a transient spread of seizure discharges from the right medial temporal structures to the contralateral hippocampal region. Postictal amnestic states were characterized by retrograde as well as lengthy anterograde amnesia that followed a complex partial seizure, whereby contralateral medial structures was involved in seizure discharges more prominently and thus widespread. PAS was deemed to be attributed to a coexistence of ictal dysfuncton of unilateral temporal lobe and postictal dysfunction of contralateral hippocampus, whereas postictal amnestic states to a recovery process from profound ictal dysfunction of bilateral medial temporal structures. PAS represents a rare condition of simple partial seizure.
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