EEG Abnormal Epileptiform Patterns 5

Question 1

Which EEG finding is the ictal correlate of epilepsia partialis continua (Kojewnikow syndrome)?

Accepted Answer

Continuous focal rhythmic delta activity with embedded spikes over the motor cortex

Answer

Epilepsia partialis continua produces continuous or near-continuous focal rhythmic discharges, often with embedded spikes, localized to the contralateral motor cortex.

Question 2

On a neonatal EEG, which feature best distinguishes a seizure discharge from a normal sharp transient?

Accepted Answer

Evolution in frequency, amplitude, or spatial distribution over time

Answer

Neonatal seizures are defined by electrographic evolution — a clear change in frequency, morphology, or field — rather than by a fixed amplitude or sleep-state rule.

Question 3

Generalized paroxysmal fast activity (GPFA) during slow-wave sleep is the characteristic ictal correlate of which seizure type in Lennox-Gastaut syndrome?

Accepted Answer

Tonic seizures

Answer

Tonic seizures in Lennox-Gastaut syndrome are associated with generalized paroxysmal fast activity (GPFA, 10–25 Hz) predominantly during NREM sleep.

Question 4

A 6-Hz spike-and-wave burst lasting less than 2 seconds seen in a drowsy young adult is most consistent with:

Accepted Answer

Phantom spike-and-wave (benign variant)

Answer

The 6-Hz 'phantom' spike-and-wave is a benign normal variant in drowsy young adults and should not be misinterpreted as pathological epileptiform activity.

Question 5

Which EEG pattern during absence status epilepticus distinguishes it from typical 3-Hz absence discharges?

Accepted Answer

The discharges become fragmented, irregular, and slower (< 2.5 Hz) over time

Answer

During prolonged absence status epilepticus, the initially regular 3-Hz spike-and-wave tends to slow, fragment, and become irregular as status continues.

EEG - Electroencephalography Practice Test

EEG - Electroencephalography Practice Test

EEG Abnormal Epileptiform Patterns 5