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Normal Variants

practice for EEG registry

Describe MU Negative arch-shaped 7-11 hz rhythmic activity most often located in C3 or c4 can occur unilaterally or bilaterally and can shift. does not attenuate with eye opening. during wake stops with moving contralateral arm.
Describe the third rhythm (temporal lobe alpha) and its occurance alpha range activity located in the temporal region. Occurs in the wake state. seen only in some patients who have a skull defect.
describe slow alpha variant and its occurence A sub-harmonic of the posterior dominant alpha rhythm often notched and occurring at-4 to 5 hz.. occurs in wake state with eyes closed attenuates (blocks) with eyes opening
Describe fast alpha variant and its occurrence 16 to 20 hz posterior rhythm can be armonic (twice as fast) as the patients alpha rhythm Occurs in the wake state with eyes closed attenuates with eye opening.
describe subclinical rhythmic electrographic discharge of adults (SREDA) Periodic sharp activity that progresses into monorhythmic theta pattern of sharply contoured theta. Occurs in the waking state of older patients no symptom or clinical changes are associates with discharge
Describe rhythmic midtemporal theta of drowsiness and its occurence. Sharply contoured of 5 to 7 hz theta activity of temporal and central localization often has a notched appearance. occurs in drowsiness or relaxed wakefulness
Describe 14 and 6 positive spikes and their occurence Sharply contoured trains of 16 and 6 hz spike waves in the posterior region maximal at T%\T^ best recorded from widely spaced electrodes so best seen on a referential montage contralateral ear drowsy or N1
Describe positive occipital sharp transients of sleep (posts) and their occurrence Surface positive 4 to 5 hz theta waves in the occipital regions n1 /N2
Describe lambda and its occurrence surface positive waves in the occipital regions that are transient activity associated with saccadic eye movements while patient eyes are open that block with eye closure
Describe wickets spikes and their occurrence. Sharply contoured waves located in the temporal region; seen bilaterally or independently, no slow wave drowsy and N1
Describe phantom spike and wave (6 hz spike and wave and its occurrence parietal or occipital low voltage spike and wave complexes that occur as a single wave or in brief bursts the spike is very low voltage om comparison with the slow wave drowsiness
Describe benign epileptiform transients of sleep (BETS) asls called small sharp spike (SSS) and their occurrence Low voltage sharp waves that occur on one or both sides in the temporal and frontal regions; may mimic EKG artifact seen most often on referential montages occurs n1 and N2 sleep
Created by: moeegtech