Which EEG pattern is classically associated with absence seizures in pediatric patients?

• A. 3 Hz Spike-and-Wave
• B. Centrotemporal Spikes (Rolandic)
• C. Burst-Suppression
• D. Generalized Tonic-Clonic Discharges

Answer: (A)

Absence seizures in children have a distinctive EEG signature: generalized, symmetric 3 Hz spike-and-wave discharges. This pattern shows up as quick spikes followed by slow waves that repeat about three times per second across the entire brain, reflecting a synchronized thalamocortical rhythm. Clinically, these events are brief lapses in consciousness with a blank stare, often without focal motor symptoms, and they tend to be provoked by hyperventilation during testing.

Why this is the right pattern: the 3 Hz spike-and-wave pattern is the classic hallmark of typical absence epilepsy, distinguishing it from other seizure types. Patterns like centrotemporal spikes are focal and linked to rolandic epilepsy, not generalized absence. Burst-suppression indicates severe brain dysfunction rather a pediatric absence syndrome. Generalized tonic-clonic discharges describe convulsive seizures, not the brief, nonconvulsive episodes seen in absence.