II-C. Recording strategies Flashcards
Which of the following is the most appropriate instrumentation setting change that should be made in order to enhance cortical slowing?
A) Change the LFF from 1 Hz. to 5 Hz
B) Change the HFF from 70 Hz. to 25 Hz
C) Change the LFF from 70 Hz to 15 Hz
D) Change the HFF from 70 Hz to15 Hz
Change the LFF from 1 Hz. To .1 Hz.
When using the average reference, if a spike-and-wave focus appears at C3, the abnormality would be best enhanced by
A) Decreasing sensitivity
B) Switching to Cz referential montage
C) Excluding C3 and surrounding electrodes from reference
D) Excluding C3 and surrounding electrodes from reference
Excluding C3 and surrounding electrodes from reference.
A slow wave focus is best seen with
A) LF 0.3HZ, paper speed 60mm/sec
B) LF 5HZ, paper speed 15mm/sec
C) LF 0.3HZ, paper speed 15mm/sec
D) HF 70HZ, paper speed 60mm/sec
LF 0.3HZ, paper speed 15mm/sec
The best reference electrode is an awake patient with excessive temporal myogenic activity would be
A) mastoids
B) ear lobes
C) CZ
D) neck
Cz
Which combination of settings will help enhance a low voltage slow wave that is being masked by muscle activity?
A) Sens 5; LF 0.3; HF 35
B) Sens 7; LF 1; HF 70
C) Sens 10; LF 1; HF 15
D) Sens 2; LF 5; HF 35
Sens 5; LF 0.3; HF 35
When attempting to minimize relentless muscle artifact on a recording, the technologist should be aware that lowering the high filter could cause the artifact to resemble:
A) 3 Hz spike and wave
B) polymorphic delta activity
C) vertex waves
D) beta activity
beta activity.
Which montage would be best to localized occipital spikes by phase reversal?
A) Common average montage
B) Contralateral ear referential montage
C) Transverse bipolar montage
D) Circumferential bipolar montage
Circumferential bipolar montage
Of the following, the BEST choice of reverence to be used when recording in suspected temporal lobe epilepsy is:
A) Ipsilateral ear
B) A1+A2
C) nasopharyngeals
D) Cz
Cz
A waveform of 0.5 Hz can be best enhanced with a filter of
A) LF 1.0 Hz
B) LF 5 Hz
C) LF 0.3 Hz
D) HF 35 Hz
LF 0.3 Hz
Laplacian montage
A) end of chain montage
B) source reference derivation
C) fast fourier transform
D) average reference
source reference derivation
Referential recording is most appropriate for measuring
A) duration
B) phase
C) frequency
D) voltage
voltage.
To enhance the background alpha and beta asymmetry is an EEG record showing moderately high voltage delta activity, the technologist should use a
A) shorter time constant and increased sensitivity
B) longer time constant and increased sensitivity
C) longer time constant and decreased sensitivity
D) shorter time constant and decreased sensitivity
shorter time constant and increased sensitivity.
Which of the following montages would best display the amplitude of a left temporal spike?
A) Anterior-posterior bipolar temporal chain
B) Left temporal to the contralateral ear
C) transverse (coronal) bipolar chain
D) Left temporal to the ipsilateral ear
Left temporal to the contralateral ear
Which of the following settings could be used to reduce the effects of seat artifact in a patient with asymmetrical low-voltage fast activity?
A) S=10 microvolts/mm, LF=0.3 Hz, HF=35 Hz
B) S=5 microvolts/mm, LF=5 Hz, HF=70 Hz
C) S=5 microvolts/mm, LF=1 Hz, HF=70 Hz
D) S=15 microvolts/mm, LF=5 Hz, HF=70 Hz
S=5 microvolts/mm, LF=5 Hz, HF=70 Hz
Fourteen and six Hz positive spikes are best recording with
A) a bipolar chain
B) an average reference
C) the contralateral ear reference
D) both ears connected to the reference
the contralateral ear reference.
