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Epileptic spasms preceded by partial seizures with a close temporal association
Epilepsia
|November 24, 1999
Summary
Patients with West syndrome experiencing partial seizures before epileptic spasms (PS-ES) often have prenatal brain lesions and poor developmental outcomes. This specific seizure pattern indicates a distinct subgroup with unique clinical features.
Area of Science:
- Neurology
- Pediatric Neurology
- Epileptology
Background:
- West syndrome is a severe infantile epilepsy characterized by epileptic spasms, hypsarrhythmia, and developmental delay.
- Understanding seizure semiology is crucial for diagnosis and prognosis in pediatric epilepsy syndromes.
Purpose of the Study:
- To identify distinctive features of West syndrome patients with partial seizures preceding epileptic spasms (PS-ES).
- To compare clinical characteristics and outcomes of patients with and without PS-ES.
Main Methods:
- Retrospective analysis of 45 West syndrome patients with simultaneous video-electroencephalography (EEG) monitoring.
- Comparison of 8 patients with PS-ES against 37 patients without PS-ES.
Main Results:
- 17% of patients exhibited PS-ES, often associated with organic brain lesions of prenatal origin.
- Seizure sequences varied, with PS-ES resolving or evolving within 1-34 months.
- All patients with PS-ES had significant psychomotor impairment, including inability to walk or speak sentences by age 3.
Conclusions:
- PS-ES in West syndrome is linked to prenatal brain abnormalities and a worse psychomotor prognosis.
- Asymmetric hypsarrhythmia on EEG and a history of other seizure types may precede PS-ES.
- PS-ES represents a distinct subgroup requiring tailored management and prognostic considerations.