Part 1 Flashcards
How much deflection will occur if a 100uV spike is recorded at a sensitivity of 10uV/mm and HFF 70Hz, LFF 0.5Hz
10mm
How much voltage would be recorded if 25uV beta activity is recorded using a LFF of 1Hz
25uV
An asymmetry of the occipital alpha rhythm voltage from the two hemispheres should be no greater than _______.
50%
Which of the following best describes lambda waves:
a. 8-10 Hz activity present in central regions
b. posterior, polyphasic waves seen in adolescents
c. transients in the occipital regions present with visual scanning
d. Delta waves that phase reverse at the vertex
c. transients in the occiptal regions present with visual scanning
The ratio of chest compressions to breaths in one-person CPR is _______.
30:2
When performing an EEG for evaluation of a central nervous system disease that may have infectious etiology, the tech should ________.
observe universal precautions.
What term is used to describe brainstem injury in a patient who is completely paralyzed except for vertical eye movement:
Locked-in syndrome
Which condition is characterized by rigidity, tremors, and festination?
Parkinson’s disease
Which of the following is NOT a characteristic of REM sleep:
a. low-voltage mixed frequency EEG activity
b. reduced EMG activity
c. sawtooth waves
d. K-complexes
d. K-complexes
The presence of sleep spindles and V waves in the EEG signals what stage of sleep?
stage II
A family history of epilepsy is especially important to determine the diagnosis of _______.
classic absence seizures
Activation of an absence seizure is most consistently obtained during _________.
hyperventilation
Photic driving ________.
may or may not be present in a normal EEG recording.
A recommended method of monitoring infusion motor artifact from intravenous (IV) infusion pumps is to place two electrodes on ___________.
the infusion pump apparatus
Which of the following medications can commonly cause increased theta and beta activity at therapeutic doses:
a. antidepressants
b. chloral hydrate
c. analgesics
d. antihistamines
a. antidepressants
Of the following, which would be the most beneficial in evaluating suspected narcolepsy:
a. pneumoencephalography
b. electroencephalography
c. all night polysomnography
d. multiple sleep latency test
d. multiple sleep latency test
The sleep disorder that occurs most commonly in the adult population is _______.
sleep apnea
Electrocerebral inactivity is defined as no electrical activity greater than _______.
2.0 uV
ACNS guidelines 2006 state that vertical scaling on digital EEG instruments should have a minimum of ___ per channel when displaying up to ___ channels.
10mm, 21
Cancellation occurs when ________.
the voltage in input 1 is the same as the voltage in input 2.
In an EEG instrument, what component transforms alternating current into direct current?
the power supply
A longer time constant results in _________.
more slow frequencies recorded
A small fluctuating output recorded by the EEG instrument even when there is no input signal is called _______.
noise
A combination of electronic components designed to increase the power, voltage, or current of a signal
amplifier
Which of the following is NOT a valid expression of Ohm’s law? (in this equation, E [electromotive force] is the same as V [voltage])
a. R=EI or R=VI
b. E=IR or V=IR
c. I=E/R or I=V/R
d. R=E/I or R=V/I
a. R=EI or R=VI
What is the action of a capacitor?
It stores energy
The EEG amplifier is designed so that when input 1 is more than input 2, the deflection will be:
upward
The homunculus is ____________.
a representation of the motor and sensory cortex of the brain
The basic unit of resistance is the _____.
ohm
The term RAM means:
temporary memory storage that is critical to rapid computer operations
The foramen of Munro is the ___________.
opening between lateral ventricles and third ventricle of the brain
A malignant tumor primarily seen in children may be _________.
medulloblastoma.
A patient with sensory aphasia will have difficulty ___________.
comprehending the meaning of words or phrases.
Port wine stain is associated with _________.
Sturge-Weber syndrome
A patient complaining of right hemiplegia will have ______________.
difficulty moving the right half of the body.
Interictal discharges in patients with complex partial seizures are most likely to be recorded in the EEG during:
stage I sleep
Herniation of the uncus results in the compression of which cranial nerve?
third
Increasing depth of anesthesia causes which of the following sequences of EEG changes:
a. increased beta then intermixed theta then delta, with burst suppression if anesthesia is deep enough
b. burst suppression then delta then theta
c. loss of alpha then increased theta then widespread beta
d. delta then widespread beta then burst suppression
a. increased beta then intermixed theta then delta, with burst suppression if anesthesia is deep enough
The tracts connecting the right and left hemisphere are called _______.
basil ganglia
A circuit that allows some frequencies to pass through it, while others are blocked is a __________.
filter
Which of the following is related to an alpha coma pattern:
a. reactivity to external stimuli
b. usually indicates a good prognosis
c. is only present when the patient is alert and oriented
d. an atypical distribution of alpha
d. an atypical distribution of alpha
Six to seven Hz theta activity is typically seen in a normal adult in which of the following:
a. in the occipital regions
b. in the centro-temporal regions during photic stimulation
c. at the onset of drowsiness
d. in low voltage, paroxysmal bursts over the frontal regions
c. at the onset of drowsiness
Normal alpha, in an adult, should NOT be seen __________.
in the frontal head regions
How will changing the time base/epoch/equivalent paper speed from 10 sec to 20 sec alter a 12 Hz alpha rhythm?
It will be compressed (bunched up)
Give a false statement about current.
Current is measured in coulombs.
In a referential montage with Cz as the reference, what is the most valuable localizing feature?
highest voltage discharge
Low frequency filters are also called __________.
high pass filters
Of the following filter combinations, which would best record 3/sec spike and slow wave discharge:
a. HFF 15 Hz/LFF 5 Hz
b. HFF 35 Hz/LFF 5 Hz
c. HFF 70 Hz/LFF 1 Hz
d. HFF 35 Hz/LFF 0.5 Hz
c. HFF 70 Hz/LFF 1 Hz
Time constant is expressed in __________.
seconds
When 60 Hz interference is seen on an EEG recording, what should be checked first?
the electrode impedance
What kind of amplifiers are used to record biological signals?
differential
If the epoch/time base/equivalent paper speed is set for 20 sec per screen, one screen would be divided into 10 subdivisions and each subdivision would equal __________.
2 seconds
When recording for ECI, interelectrode impedances should be at least ____ ohms, but less than ____ ohms.
100; 10,000
The basic unit for measuring current flow is the _____.
ampere
The filters creating a very narrow band pass that should rarely be used clinically are __________.
LFF 5 Hz and HFF 15 Hz
When recording for electrocerebral inactivity (ECI), the interelectrode distance should be at least _______.
10 cm
What is NOT a source of 60 Hz interference?
intravenous drip
Name a nonphysiological artifact.
60 Hz interference
Eye leads place at the outer canthus of each eye will record ________.
mainly horizontal eye movements
The best metals for clinical EEG recording are ____________.
silver-silver chloride, platinum, and gold
Which electrodes do NOT record directly from the brain?
subdermal
The distance from Cz to Pz is 6.8 cm. What is the distance from nasion to inion?
34 cm
In a referential montage, how is the origin of the potential determined?
amplitude
Due to a central scalp lesion, C4 has to be relocated 4 mm anteriorly. The tech should ___________.
relocate C3 4mm anteriorly
In the illustration, which electrode is active and what is the polarity?
F7-A1 -----v----- F8-A2 ------------ F3-A1 -----v----- F4-A2 ------------ P3-A1 -----v----- P4-A2 ------------
A1 negative
According to the ACNS guidelines 2006, the minimum sampling rate for EEG data, should be at least ___ times the highest high frequency filter setting.
three
In a record with 10 Hz alpha activity, when the display epoch is changed from 10 sec per display screen to 20 sec per display screen, the frequency of the activity will be ______.
10 Hz
A megabyte of memory is approximately equal to ______.
one million bytes
Inflammation of the coverings of the brain or spinal cord is called ______.
meningitis
The most common symptoms of which type of head injury are a temporary loss of consciousness, followed by confusion, severe headache, and possibly amnesia for the accident?
concussion
