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Updated: May 29, 2026

Behavioral Characterization of Pentylenetetrazole-induced Seizures: Moving Beyond the Racine Scale
Published on: July 8, 2025
Confusion and SIRPIDs regress with parenteral lorazepam
Peter W Kaplan1, Josh Duckworth
1Department of Neurology, The Johns Hopkins Bayview Medical Center, Baltimore, MD, USA. pkaplan@jhmi.edu
Abstract:
Stimulus-induced rhythmic, periodic or ictal discharges (SIRPIDs) are EEG epileptiform periodic discharges (PD) induced by arousal. SIRPIDs lie along an ictal-interictal continuum with debate regarding urgency of treatment. In a patient with SIRPIDs, aphasia and confusion, i.v. lorazepam during EEG resulted in improved level of consciousness, return of verbal interaction and regression of SIRPIDs. This suggests that some forms of SIRPIDs may be associated with an ictal confusional state.
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