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Eeg in absence seizure1/26/2024 NCSE with coma (back to contents) causes & associations. Patients with absence seizures or preserved consciousness may often be treated less aggressively. The International League Against Epilepsy Classification of 2017 defines absence seizures as “generalized non-motor seizures.” However, this term is not entirely precise because, as discussed below, motor manifestations of absence epilepsy are frequently seen.Ĭopyright © 2023, StatPearls Publishing LLC. Epilepsy or prior seizures (especially status epilepticus followed by a prolonged or unusual postictal period with lingering neurological abnormalities). Historically, absence epilepsy was known as “pyknolepsy.” This term originates from the Greek term pyknos, which means “very frequent” or “grouped.” The term “petit mal” seizure was once used to describe an absence seizure in the past, but it is no longer encouraged. Absence seizures are brief seizures characterized by a behavioral arrest that correlates with generalized 3-Hertz spike-and-wave discharges on electroencephalogram (EEG.) Absence seizures occur in multiple genetic generalized epilepsies, including childhood absence epilepsy (CAE), juvenile absence epilepsy (JAE), and juvenile myoclonic epilepsy (JME.) Atypical absence seizures have been reported in up to 60% of patients with Lennox-Gastaut syndrome. The EEG features of absence seizures are influenced by a complex interaction of age, epilepsy syndrome, level of arousal, provoking factors, and other intrinsic factors.
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