Startle-Induced Epileptic Spasms: A Clinical and Video-EEG Study

Area of Science:

• Neurology
• Epileptology
• Neurophysiology

Background:

• Epileptic spasms (ES) are a challenging epilepsy syndrome.
• Startle-induced epileptic spasms (ES) represent a specific subtype requiring detailed characterization.

Purpose of the Study:

• To delineate the clinical characteristics of startle-induced ES.
• To identify the brain regions of origin for startle-induced ES.

Main Methods:

• Analysis of 30 patients with startle-induced ES using video-electroencephalogram (EEG) and seizure semiology.
• Evaluation of clinical data, neuroimaging, interictal epileptiform discharges, and ictal high-frequency oscillations (HFOs).

Main Results:

• The mean age of onset was 28.1 months, with half having structural etiology.
• Frontal cortex abnormalities were common (60%), and anterior ictal HFOs were significantly higher than posterior ones (p < 0.05).
• Most patients experienced mild to severe psychomotor developmental delay; seizures were often drug-resistant.

Conclusions:

• Startle-induced ES are frequently associated with brain lesions and drug resistance.
• Neuroimaging and EEG findings, including ictal HFOs, suggest a frontal cortex origin for these seizures.