EEG Abnormal Epileptiform Patterns 2

Question 1

Which EEG pattern is characterized by a spike followed by a slow wave complex occurring at approximately 3 Hz?

Accepted Answer

Generalized 3 Hz spike-and-wave

Answer

Hypsarrhythmia

Answer

Periodic lateralized epileptiform discharges

Answer

Burst suppression

Question 2

What is the typical duration criterion for an EEG spike?

Accepted Answer

20 to 70 milliseconds

Answer

Less than 20 milliseconds

Answer

70 to 200 milliseconds

Answer

200 to 500 milliseconds

Question 3

Periodic lateralized epileptiform discharges (PLEDs) are most commonly associated with which condition?

Accepted Answer

Acute structural brain lesion such as stroke

Answer

Metabolic encephalopathy

Answer

Benign childhood epilepsy

Answer

Normal drowsiness

Question 4

Which epileptiform pattern consists of high-amplitude, chaotic, multifocal spikes and slow waves seen in infantile spasms?

Accepted Answer

Hypsarrhythmia

Answer

Generalized polyspike-and-wave

Answer

Electrical status epilepticus in sleep

Answer

Focal cortical dysplasia pattern

Question 5

What feature best distinguishes a benign epileptiform transient of sleep (BETS) from a pathological epileptiform discharge?

Accepted Answer

BETS are typically small, isolated, and lack an after-going slow wave

Answer

BETS have a duration greater than 200 milliseconds

Answer

BETS occur only during REM sleep

Answer

BETS always appear in the frontal regions

Question 6

Generalized periodic discharges (GPDs) at 1-2 Hz intervals with triphasic morphology are most characteristic of which condition?

Accepted Answer

Hepatic encephalopathy

Answer

Juvenile myoclonic epilepsy

Answer

Lennox-Gastaut syndrome

Answer

Benign rolandic epilepsy