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Updated: Jun 12, 2026
07:35
Behavioral Characterization of Pentylenetetrazole-induced Seizures: Moving Beyond the Racine Scale
Published on: July 8, 2025
Polyspike ictal onset absence seizures
William O Tatum1, Son Ho, Selim R Benbadis
1Tampa General Hospital, University of South Florida, Department of Neurology, Mayo College of Medicine, Mayo Clinic, Jacksonville, FL 32224, USA. wotiv@aol.com
Summary
Absence seizures with polyspike onset in idiopathic generalized epilepsy (IGE) may indicate a drug-resistant epilepsy subtype. This finding suggests polyspike onset is a predictor of treatment resistance in epilepsy patients.
Area of Science:
- Neurology
- Epileptology
- Clinical Neurophysiology
Background:
- Epilepsy diagnosis and treatment can be challenging.
- Idiopathic generalized epilepsy (IGE) encompasses various seizure types.
- Absence seizures are a common manifestation of IGE.
Purpose of the Study:
- To investigate the characteristics of absence seizures with polyspike onset in adults with IGE.
- To determine if polyspike onset in absence seizures predicts treatment response.
Main Methods:
- Retrospective analysis of video electroencephalogram (EEG) data from 1,164 patients.
- Identification of seven adult patients with IGE and absence seizures preceded by polyspike onset.
- Clinical and EEG data review with at least a 1-year follow-up.
Main Results:
- Seven adult patients (4 female, 3 male; mean age 28.9 years) with IGE had absence seizures with polyspike onset prior to 3-Hz generalized spike-and-waves (GSW).
- Absence seizures were the primary seizure type for all seven patients.
- Most patients experienced seizure onset between 4 and 20 years and had failed at least two antiepileptic drug trials.
Conclusions:
- Polyspike onset in absence seizures is observed in a subset of adults with IGE.
- This pattern may represent an intermediate form of IGE that is often resistant to antiepileptic drug treatment.
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