EEG Abnormal Epileptiform Patterns 4

Question 1

Which EEG pattern is characterized by bilateral synchronous 3-Hz spike-and-wave discharges that are typically enhanced by hyperventilation?

Accepted Answer

Childhood absence epilepsy

Answer

Juvenile myoclonic epilepsy

Answer

Lennox-Gastaut syndrome

Answer

Dravet syndrome

Question 2

A patient's EEG shows slow (1–2.5 Hz) spike-and-wave complexes during sleep alongside atonic and tonic seizures. Which syndrome does this pattern most suggest?

Accepted Answer

Lennox-Gastaut syndrome

Answer

West syndrome

Answer

Dravet syndrome

Answer

Angelman syndrome

Question 3

Hypsarrhythmia on EEG is the interictal hallmark of which epilepsy syndrome?

Accepted Answer

West syndrome

Answer

Lennox-Gastaut syndrome

Answer

Ohtahara syndrome

Answer

Landau-Kleffner syndrome

Question 4

On EEG, a burst-suppression pattern in a neonate without hypothermia treatment most likely indicates which condition?

Accepted Answer

Ohtahara syndrome

Answer

Benign neonatal sleep myoclonus

Answer

Hypoxic-ischemic encephalopathy grade I

Answer

Normal preterm variant

Question 5

Which epileptiform feature specifically distinguishes a true spike from a sharp wave on EEG?

Accepted Answer

Duration less than 70 ms vs. 70–200 ms

Answer

Amplitude greater than 200 µV

Answer

Occurrence only during NREM sleep

Answer

Presence of a following slow wave

Question 6

Centrotemporal spikes (rolandic spikes) in a child are associated with which EEG characteristic regarding sleep?

Accepted Answer

They increase in frequency and may become bilateral during NREM sleep

Answer

They disappear entirely during NREM sleep

Answer

They are only seen during REM sleep

Answer

They occur exclusively during drowsiness

Question 7

A patient has recurrent brief lapses with 3-Hz spike-and-wave that are abruptly terminated by photic stimulation. This response pattern is called:

Accepted Answer

Photoparoxysmal response

Answer

Photomyogenic response

Answer

Fixation-off sensitivity

Answer

Scotosensitivity