EEG board Exam prep Study Guide
Mu Rhythm
-c3/c4 region
-7-11Hz
-does not block with eye opening
-easy to see with eyes open
-blocks unilaterally with contralateral hand
-asymmetrical and asynchronous
-NORMAL
Beta
->14 HZ
-detected during wakefulness, enhanced during drowsiness, and decreased in deeper
sleep
-seen on barbiturates and benzodiazepines
Lambda waves
-NORMAL, awake
-sharp waves occurring in occipital region (o1/o2) during wakefulness
-visually scanning a picture in a lit room
-physiological, eyes OPEN
-saccadic eye movement
-4-6hz
Small sharp spikes / BETS
-occurs in stage 1/stage 2
-peaks at 30-60 years
-temporal region
-occurs sporadically and short duration
-NORMAL benign variant
Wicket Spikes
-Single spike or 6-11 hz Mu like shape seen in drowsiness and light sleep.
-mid temporal region
-seen in adults over 30
-NORMAL benign variant
14&6hz positive spikes
-posterior/temporal region (t5/t6)
-normal benign variant
-light sleep
-best seen in referential montage
-runs last less than 2 seconds
-seen in a lot of adolescents
sleep spindles
-11-14hz , 1/2 second duration
-central regions
-asynchrony is abnormal after 2years old
-stage 2 sleep
Hypnagogic Hypersynchrony
, -2-6years old
-central/frontal regions
-paroxysmal bursts high voltage, 3-4.5hz
-normal variant of drowsiness
Dilantin toxicity
ataxia (loss of control of body muscles)
Laplacian montage
-source reference deviation
-looks at only the electrodes that are closest to the point of interest
-emphasizes localized waveforms
deja vu
-complex partial sz
-automatisms/impaired consciousness
extreme spindles
-found in MR (mental retardation) patients
-high voltage, anterior dominant
-generalized
OIRDA (Occipital Intermittent Rhythmic Delta Activity)
-encephalopathy eeg pattern most associated with children
-high amplitude, saw toothed, and reactive to eye opening
Rolandic Spikes
-seen in children
-cento/temporal
-seen in benign rolandic epilepsy
FIRDA
-Frontal Intermittent Rhythmic Delta Activity
-reacts to stimulation
-2-3hz
-rhythmic
-awake adult eeg
Atonic seizure (drop attack)
generalized seizure characterized by sudden loss of muscle tone and strength; may
cause the head to drop suddenly, objects to fall from the hands, or the legs to lose
strength, with falling and potential injury
Tonic seizure
Muscle stiffness, rigidity
photomyogenic response
-normal physiological response to photic light
-frontal leads
-only seen with eyes closed
Photoparoxysmal response
-abnormal response to photic
-spikes, polyspikes, or spike/waves
-mostly seen in FQ >10hz
HV contraindications
Mu Rhythm
-c3/c4 region
-7-11Hz
-does not block with eye opening
-easy to see with eyes open
-blocks unilaterally with contralateral hand
-asymmetrical and asynchronous
-NORMAL
Beta
->14 HZ
-detected during wakefulness, enhanced during drowsiness, and decreased in deeper
sleep
-seen on barbiturates and benzodiazepines
Lambda waves
-NORMAL, awake
-sharp waves occurring in occipital region (o1/o2) during wakefulness
-visually scanning a picture in a lit room
-physiological, eyes OPEN
-saccadic eye movement
-4-6hz
Small sharp spikes / BETS
-occurs in stage 1/stage 2
-peaks at 30-60 years
-temporal region
-occurs sporadically and short duration
-NORMAL benign variant
Wicket Spikes
-Single spike or 6-11 hz Mu like shape seen in drowsiness and light sleep.
-mid temporal region
-seen in adults over 30
-NORMAL benign variant
14&6hz positive spikes
-posterior/temporal region (t5/t6)
-normal benign variant
-light sleep
-best seen in referential montage
-runs last less than 2 seconds
-seen in a lot of adolescents
sleep spindles
-11-14hz , 1/2 second duration
-central regions
-asynchrony is abnormal after 2years old
-stage 2 sleep
Hypnagogic Hypersynchrony
, -2-6years old
-central/frontal regions
-paroxysmal bursts high voltage, 3-4.5hz
-normal variant of drowsiness
Dilantin toxicity
ataxia (loss of control of body muscles)
Laplacian montage
-source reference deviation
-looks at only the electrodes that are closest to the point of interest
-emphasizes localized waveforms
deja vu
-complex partial sz
-automatisms/impaired consciousness
extreme spindles
-found in MR (mental retardation) patients
-high voltage, anterior dominant
-generalized
OIRDA (Occipital Intermittent Rhythmic Delta Activity)
-encephalopathy eeg pattern most associated with children
-high amplitude, saw toothed, and reactive to eye opening
Rolandic Spikes
-seen in children
-cento/temporal
-seen in benign rolandic epilepsy
FIRDA
-Frontal Intermittent Rhythmic Delta Activity
-reacts to stimulation
-2-3hz
-rhythmic
-awake adult eeg
Atonic seizure (drop attack)
generalized seizure characterized by sudden loss of muscle tone and strength; may
cause the head to drop suddenly, objects to fall from the hands, or the legs to lose
strength, with falling and potential injury
Tonic seizure
Muscle stiffness, rigidity
photomyogenic response
-normal physiological response to photic light
-frontal leads
-only seen with eyes closed
Photoparoxysmal response
-abnormal response to photic
-spikes, polyspikes, or spike/waves
-mostly seen in FQ >10hz
HV contraindications
