II.L Normal Variants Flashcards
Lambda waves are
A) best seen just before falling asleep
B) usually negative in Bipolar derivations
C) precursors of POSTS
D) evoked by eye movement
evoked by eye movement.
Mu rhythm and alpha rhythm differ from each other in all of the following respects EXCEPT:
A) form
B) topography
C) incidence
D) frequency
frequency
Bancauds phenomenon, alpha squeak and paradoxical alpha all have to do with
A) an abnormality of the background
B) non-responsiveness of the alpha rhythm
C) drowsy effect on the alpha rhythm
D) a reaction of the background
a reaction of the background.
An uncommon, but normal variant seen in adults 50 and older that may be mistaken for epileptiform activity.
A) Ciganek rhythm
B) SREDA
C) SIRPIDS
D) BETS
SREDA
What is the electrical abnormality associated with Breach rhythm?
A) A focal low impedance pathway through the skull
B) A focal low impedance swelling of the scalp
C) A focal high impedance pathway through the skull
D) A focal high voltage electrical generator in the cortex
A focal low impedance pathway through the skull
Mu Rhythm:
A) C3/C4
B) T5/T6
C) O1/O2
D) P3P4
C3/C4
What normal activity would be seen most prominently at the C3 or C4 electrode position?
A) Alpha
B) POSTS
C) Mu
D) FIRDA
Mu
Which normal waveform is NOT typically seen in the posterior leads?
A) Wickets
B) POSTS
C) Lambda
D) Photic driving
Wickets
Rare 6-11 hz negative sharp arciform waves, most commonly seen in adults over 30 years in the mid-temporal regions.
A) Mu
B) Midline theta rhythm
C) Wickets
D) RMTD
Wickets
Posterior Dominant Rhythm (PDR) or Alpha Rhythm should not be calculated immediately upon eye closure because of what normal variant?
A) Slow Alpha Variant
B) Alpha Squeak
C) Posterior Slow Waves of Youth (PSWOY)
D) Clenoids
Alpha Squeak
What do Mittens, midline rhythmic theta, and Trace alternans have in common?
A) They are all markers of neonatal immaturity
B) They are all normal waveforms
C) They all appear exclusively from wakefullness
D) They are all consistent with encephalopathy
They are all normal waveforms
Which of the following is normal activity seen in the occipital regions when a patient’s eyes are scanning a detailed picture?
A) Lambda
B) Posterior slow waves of youth
C) Slow alpha variant
D) Mu
Lambda
What environmental factors enhance LAMBDA?
A) Loud sounds
B) Noxious
C) Scanning high complexity visual scene
D) Low illumination visual scene
Scanning high complexity visual scene
Which pattern is most likely to be seen during prolonged recordings of a normal awake 30 year old
A) Lambda
B) OIRDA
C) SREDA
D) FIRDA
Lambda
