CNIM QUESTIONS WITH CORRECT
ANSWERS
Which of the following would best enhance resolution of evoked
potential waveforms? - CORRECT ANSWER-Increase number
of averaged stimuli
What is the typical MINIMUM common mode rejection ratio of
in-phase signals recommended for evoked potential
instr...
Which of the following would best enhance resolution of evoked
potential waveforms? - CORRECT ANSWER-Increase number
of averaged stimuli
What is the typical MINIMUM common mode rejection ratio of
in-phase signals recommended for evoked potential
instruments? - CORRECT ANSWER-10,000:1
Which of the following cranial nerves is most at risk during
acoustic neuroma surgery? - CORRECT ANSWER-CN VII
The impedance of cup electrodes is: - CORRECT ANSWER-
Lower than needle electrodes because of their size
Amplitude of an evoked potential depends on which of the
following physiological actions in a sensory pathway? -
CORRECT ANSWER-The number of cortical or subcortical
generators simultaneously activated.
What is the approximate amplitude resolution of a 10-bit
digitizer with a range of plus or minus 5 uV? - CORRECT
ANSWER-What is the approximate amplitude resolution of a
10-bit digitizer with a range of plus or minus 5 uV?
,Posterior Fossa - CORRECT ANSWER-Brainstem
Using the International 10-20 electrode placements, if the
measurement from nasion to inion is 30 cm, what is the
distance from Fz to Cz? - CORRECT ANSWER-6 cm
Which of the following most likely results in increased firing of a
neuron? - CORRECT ANSWER-Excitatory postsynaptic
potential
Compared to electrode impedance, the input impedance of the
amplifier should be - CORRECT ANSWER-Higher
The appropriate stimulus intensity of stimulating median nerve
at the wrist for recording SEP is: - CORRECT ANSWER-Just
above motor threshold
The recommended amplitude resolution of the analog to digital
converter must be a MINIMUM of - CORRECT ANSWER-8 bits
If the trials are not reproducible - CORRECT ANSWER-Perform
an additional trial
An absent cervical N13 associated with normal Erb's potential,
P14 subcortical and N20 cortical potentials can be seen in a
patient with the diagnosis of: - CORRECT ANSWER-
Syringomyelia
(a cyst forms within the spinal cord)
N11 GENERATOR - CORRECT ANSWER-Spinal nerve root
Artifact rejection rejects signals based on: - CORRECT
ANSWER-Amplitude
Following stimulation of the left posterior tibial nerve, maximal
amplitude cortical SSEP responses will usually be found
between - CORRECT ANSWER-C3 and Cz
,The incidence of abnormal BAEP in patients with a definite
diagnosis of MS is: - CORRECT ANSWER-60-70%
Ankylosis is? - CORRECT ANSWER-Fused joint
Transcranial magnetic and electrical motor evoked potentials
are primarily generated in the: - CORRECT ANSWER-Lateral
corticospinal tracts
Wrist drop is caused by an injury to the: - CORRECT
ANSWER-Radial nerve
The trigeminal nerve EMG response has a latency of
approximately - CORRECT ANSWER-3-5 milliseconds
avg latency 5 msec
Positivity at the vertex produces a downward deflection -
CORRECT ANSWER-Latency and amplitude
In tibial SSEP, an interpeak latency of 12 msec for P24-P31
suggests: - CORRECT ANSWER-Lesion in the spinal cord.
Which of the following are thalamic nuclei for the
somatosensory pathway? - CORRECT ANSWER-VPL nucleus
When recording evoked potentials, changing analog high- and
low-frequency filters affects: - CORRECT ANSWER-latency
and amp
If your patient has left hemi-sensory loss of pain-temperature
sense but normal proprioceptive sense, median nerve SSEP
will likely show: - CORRECT ANSWER-Normal SSEP recorded
from CP4.
What is an advantage of synchronous stimulation? - CORRECT
ANSWER-Maximal response
, What does an increased N13-N20 central conduction time with
normal N9-N20 conduction time and a normal nerve conduction
velocity indicate? - CORRECT ANSWER-Defect above the
lower medulla at or below the somatosensory cortex
An increase in stimulation intensity causes a linear increase of
which of the following SSEP components?
P31
N45
P37
N20 - CORRECT ANSWER-P31
EEG changes after cross-clamping a carotid artery occur: -
CORRECT ANSWER-On the same hemisphere to the
clamping side.
EEG activity recorded directly from the cortex (ECoG) usually
requires sensitivities in the range of: - CORRECT ANSWER-40
to 100 µV/mm
Variant Creutzfeldt-Jacob disease is: - CORRECT ANSWER-
Associated with the consumption of bovine contaminated
products
When recording evoked potentials, which of the following filters
does NOT produce a phase shift? - CORRECT ANSWER-
Digital
The extensor hallucis longus muscle is innervated by the
____________ nerve. - CORRECT ANSWER-Common
peroneal (L4-S2) (FYI PTN is L4-S3)
What cranial nerve is monitored during cholesteatoma surgery -
CORRECT ANSWER-Facial
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