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CNIM Questions And Answers With Verified Solutions Already Passed!!!
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CNIM Questions And Answers WithVerified Solutions Already Passed!!!
Which of the following would best enhance resolution of evoked potential
waveforms? - ANSWER✔✔ Increase number of averaged stimuli
What is the typical MINIMUM common mode rejection ratio of in-phase signals
recommended for evoked potential instruments? - ANSWER✔✔ 10,000:1
Which of the following cranial nerves is most at risk during acoustic neuroma
surgery? - ANSWER✔✔ CN VII
The impedance of cup electrodes is: - 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? - 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? - ANSWER✔✔ What is the approximate amplitude resolution
of a 10-bit digitizer with a range of plus or minus 5 uV?
Posterior Fossa - 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? - ANSWER✔✔ 6 cm
,Which of the following most likely results in increased firing of a neuron? -
ANSWER✔✔ Excitatory postsynaptic potential
Compared to electrode impedance, the input impedance of the amplifier should
be - ANSWER✔✔ Higher
The appropriate stimulus intensity of stimulating median nerve at the wrist for
recording SEP is: - ANSWER✔✔ Just above motor threshold
The recommended amplitude resolution of the analog to digital converter must
be a MINIMUM of - ANSWER✔✔ 8 bits
If the trials are not reproducible - 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: -
ANSWER✔✔ Syringomyelia
(a cyst forms within the spinal cord)
N11 GENERATOR - ANSWER✔✔ Spinal nerve root
Artifact rejection rejects signals based on: - ANSWER✔✔ Amplitude
Following stimulation of the left posterior tibial nerve, maximal amplitude cortical
SSEP responses will usually be found between - ANSWER✔✔ C3 and Cz
,The incidence of abnormal BAEP in patients with a definite diagnosis of MS is: -
ANSWER✔✔ 60-70%
Ankylosis is? - ANSWER✔✔ Fused joint
Transcranial magnetic and electrical motor evoked potentials are primarily
generated in the: - ANSWER✔✔ Lateral corticospinal tracts
Wrist drop is caused by an injury to the: - ANSWER✔✔ Radial nerve
The trigeminal nerve EMG response has a latency of approximately - ANSWER✔✔
3-5 milliseconds
avg latency 5 msec
Positivity at the vertex produces a downward deflection - ANSWER✔✔ Latency
and amplitude
In tibial SSEP, an interpeak latency of 12 msec for P24-P31 suggests: -
ANSWER✔✔ Lesion in the spinal cord.
Which of the following are thalamic nuclei for the somatosensory pathway? -
ANSWER✔✔ VPL nucleus
When recording evoked potentials, changing analog high- and low-frequency
filters affects: - 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: - ANSWER✔✔ Normal
SSEP recorded from CP4.
What is an advantage of synchronous stimulation? - 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? - 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 - ANSWER✔✔ P31
EEG changes after cross-clamping a carotid artery occur: - ANSWER✔✔ On the
same hemisphere to the clamping side.
EEG activity recorded directly from the cortex (ECoG) usually requires sensitivities
in the range of: - ANSWER✔✔ 40 to 100 µV/mm
Variant Creutzfeldt-Jacob disease is: - ANSWER✔✔ Associated with the
consumption of bovine contaminated products
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