Early-onset childhood absence epilepsy: is it a distinct entity?

Area of Science:

• Pediatric Neurology
• Epileptology

Background:

• Childhood Absence Epilepsy (CAE) typically manifests between ages four and seven.
• Early-onset CAE, with onset before age three, is uncommon and rarely reported in North America.

Purpose of the Study:

• To identify and characterize pediatric patients with absence seizures starting before age three.
• To investigate the clinical features, treatment outcomes, and potential distinctiveness of early-onset CAE.

Main Methods:

• Retrospective review of electroencephalography (EEG) laboratory database and pediatric neurology clinic records (2000-2009).
• Data collection included age at onset, gender, neurodevelopmental status, antiepileptic drugs (AEDs), seizure control, and follow-up.
• Analysis of 12 identified patients with early-onset CAE.

Main Results:

• Mean age at onset was 20.5 months; 7/12 patients had normal neurodevelopment, 5/12 had speech delay.
• Seizure control varied: 4/12 were seizure-free without AEDs, 3/12 with one AED, and 5/12 remained seizure-positive on multiple AEDs.
• Three patients experienced seizure recurrence after AED withdrawal. Seizure control appeared less favorable compared to other published series.

Conclusions:

• Early-onset CAE presents with diverse neurodevelopmental outcomes and seizure control.
• The findings support the hypothesis that early-onset CAE may represent a distinct epilepsy syndrome, though further multicentric studies are needed.
• The condition's heterogeneity warrants continued investigation into its classification and management.