Facilitation of infantile spasms by partial seizures

Area of Science:

• Pediatric Neurology
• Epileptology
• Neuroscience

Background:

• Infantile spasms are a severe epilepsy syndrome in infants.
• The precise triggers and underlying mechanisms of infantile spasms remain under investigation.
• Focal cerebral lesions are frequently observed in infants with infantile spasms.

Purpose of the Study:

• To investigate the relationship between partial seizures and the onset of infantile spasms.
• To characterize clinical and EEG features of infantile spasms associated with partial seizures.
• To evaluate treatment responses and outcomes in this specific patient cohort.

Main Methods:

• Retrospective analysis of 16 patients diagnosed with infantile spasms.
• Detailed review of seizure semiology, EEG findings, neuroimaging, and treatment history.
• Correlation of partial seizure occurrence with the onset of infantile spasms.
• Assessment of response to adrenocorticotropic hormone (ACTH), antiepileptic drugs (AEDs), and surgical interventions.

Main Results:

• 16 infants presented with infantile spasms triggered by preceding partial seizures.
• Focal cerebral lesions were present in 12 infants; 3 had cryptogenic epilepsy.
• Clusters of bilateral spasms consistently followed partial seizures with EEG localization.
• Response to ACTH and traditional AEDs was generally poor.
• Surgical cortical resections in 6 infants resulted in good outcomes.
• Complete agenesis of the corpus callosum in 3 infants suggested spasms were not solely due to interhemispheric spread.

Conclusions:

• Partial seizures may facilitate or induce infantile spasms, likely involving subcortical generation modulated by focal cortical discharges.
• The findings support a model where focal cortical pathology plays a role in the pathogenesis of these spasms.
• Surgical intervention can be an effective treatment option for selected infants with this specific presentation.