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Benign EEG Variants

TermDefinition
Small Sharp Spikes (SSS)/Benign Epileptiform Transients of Sleep (BETS) Recorded mainly in adults during drowsiness & light non-rapid eye movement sleep. Typically low voltage and are short duration. Morphologically, the discharges are monophasic/diphasic spikes, at times followed by a low-voltage slow wave component.
Wicket Spikes Best appreciated during drowsiness & light sleep. Likely present when background contains sharply contoured waveforms (6-11 Hz) & are usually recorded over the anterior or mid-temporal head regions.
14- and 6-Hz Positive Bursts Seen in children & adolescents during drowsiness & light non-REM sleep. These rhythmic bursts consist of trains of arch shaped waves & occur bisynchronously or independently. The bursts are usually maximal voltage over the posterior temporal head region.
6-Hz Spike and Wave/Phantom Spike and Wave Typically has a very low voltage, fast frequency spike discharge followed by a more prominent slow-wave component usually of higher amplitude. Most common in adolescents & young adults during relaxed wakefulness & drowsiness, with disappearance in deeper
Rhythmic Temporal Theta Bursts of Drowsiness (RTTD) Recorded mostly in adolescents & young adults during relaxed wakefulness & drowsiness. Present predominantly over the posterior head regions & usually is maximal over the midtemporal regions. The discharge may have a notched or flat-topped appearance.
Subclinical Rhythmic Electrographic Discharge in Adults (SREDA) Occurs in w/hyperventilation in adults over the age of fifty. Also present during drowsiness & rest. Consists of rhythmic, sharply contoured waveforms that evolve into a sustained 5 to 6 Hz pattern. Widespread & maximal over the parietal & posterior tempo
Midline Theta Rhythms Consists of trains of rhythmic 5-7 Hz activity recorded over midline electrodes. Recorded during awake and drowsy states in both children and adults and may have a smooth, sinusoidal, arciform, spikey, or mu like appearance.
Breach Rhythms Present over skull defects. Higher in amplitude and may have a sharp appearance.
Created by: akesselman