Quiz Form

Question Date: 01/12/2023

Question: What does the inter-ictal EEG finding s/o?

Options:

Positive occipital sharp transients of sleep
Lambda rhythm
Occipital epileptiform spikes
Grade 2 Photo-paroxysmal response

Correct Answer: Occipital epileptiform spikes

View Image: Image_202311160808136555cded6e2bc.png

Explaination: For the first electrode in each chain (Fp1 and FP2) and for the last electrodes (O1 and O2) there isnt any electrode to compare to. This gives rise to the end of chain phenomenon, in which you only see half of any possible phase reversals at these electrodes Can be overcame with circular montage Positive occipital sharp transients of sleep (POSTs) occur during sleep, in isolation or in 4- to 6-Hz trains, show surface positivity that is relatively uncharacteristic of epileptiform discharges Lambda waves, which nevertheless strongly resemble POSTs, are exclusively recorded in awake subjects

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