CNIM Practice exam 2 with correct
answers
Diabetes Mellitus - ANSWER: ✔✔Peripheral Neuropathy
To display median nerve SSEP response as an upward deflection, which of the following must be known?
- ANSWER: ✔✔Waveform polarity and polarity convention of the amplifier inputs
The facial nerve enervates all of the following structures except: - ANSWER: ✔✔Tensor veli palatini
muscle
For preoperative posterior tibial somatosensory evoked potentials, which of the following would be the
best ipsilateral location for the ground electrode? - ANSWER: ✔✔Calf
"Central Cord Syndrome" results in: - ANSWER: ✔✔Loss of function at the level damaged due to
disruption of gray matter
Intraoperative evoked potential monitoring criteria of abnormality are based on a comparison of
amplitude and latency to - ANSWER: ✔✔Post incision baseline
The resting membrane potential is created by differences between the inside and outside of the cell in
ion concentrations of - ANSWER: ✔✔K+, Na+, & Cl-
It is most important for intraoperative monitoring records to include notations of - ANSWER:
✔✔Surgical events
The Nyquist frequency is - ANSWER: ✔✔Twice as great as the highest frequency
D waves are recorded from which of the following electrodes? - ANSWER: ✔✔Epidural electrodes over
the spinal cord
,Signal - to - noise ratio relates to which of the following? - ANSWER: ✔✔The amplitude of the evoked
response components to the amplitude of the unrelated components
Which of the following is the down going potential recorded at about 12 msec following stimulation of
the ear in the above diagram? - ANSWER: ✔✔Postauricular muscle reflex
Inflammation of the covering of the brain or spinal cord is called: - ANSWER: ✔✔Meningitis
The use of intraoperative monitoring during scoliosis surgery may replace the - ANSWER: ✔✔Romberg
test
P14 is a far field, sub cortically generated response which probably reflects - ANSWER: ✔✔Caudal
medial lemniscal activity
Scalp-to-noncephalic reference - ANSWER: ✔✔Fz-C5S
A post incision baseline recording is used to - ANSWER: ✔✔Establish a standard for the patient
The ulnar nerve is formed at spinal levels: - ANSWER: ✔✔C7-T1
Which of the following systolic blood pressures is most likely to attenuate the evoked potential? -
ANSWER: ✔✔120 mm/Hg
With a sampling rate of 10 kHz the shortest sine wave resolved would be - ANSWER: ✔✔0.2 msec
During a median nerve preoperative study, a patient has discomfort at the wrist. Stimulation electrodes
are 10 mm gold disk, stimulus intensity is 20 mA, and a stimulus duration is 100 usec. Which of the
following would most likely reduce the patient's discomfort while maintaining adequate stimulation? -
ANSWER: ✔✔Decrease number of repetitions
, To dissect a vestibular schwannoma, which surgical approach usually sacrifices hearing? - ANSWER:
✔✔Translabyrinthine
Exteroceptors and proprioceptors include all of the following except: - ANSWER: ✔✔Tectorial
membrane
Penetration of the sterile surgical field occurs when - ANSWER: ✔✔The surgeon's arm brushes against
the recording equipment
On the SSEP, the electrode at _____ records a spinal cord response. - ANSWER: ✔✔T12
Which of the following cranial nerves is most appropriate to monitor during resection of a 4 cm
vestibular schwannoma? - ANSWER: ✔✔Facial
Blood supply to the spinal cord: - ANSWER: ✔✔Is by an anterior spinal artery and two posterior spinal
arteries
In recording electrocochleograms it is best to stimulate using - ANSWER: ✔✔Rarefaction of
condensation clicks
The section of the brainstem that is continuous with the spinal cord and includes the decussation of the
pyramids, is the - ANSWER: ✔✔Medulla oblongata
The purpose of interbody cages is often to - ANSWER: ✔✔Restore lost disc height
The capacity to resolve amplitudes of 256 discrete steps would require an 8 bit A-to-D converter. This can
be represented by: - ANSWER: ✔✔2^8
An increase in stimulation intensity causes a linear increase of which of the following SSEP components?
- ANSWER: ✔✔P31
answers
Diabetes Mellitus - ANSWER: ✔✔Peripheral Neuropathy
To display median nerve SSEP response as an upward deflection, which of the following must be known?
- ANSWER: ✔✔Waveform polarity and polarity convention of the amplifier inputs
The facial nerve enervates all of the following structures except: - ANSWER: ✔✔Tensor veli palatini
muscle
For preoperative posterior tibial somatosensory evoked potentials, which of the following would be the
best ipsilateral location for the ground electrode? - ANSWER: ✔✔Calf
"Central Cord Syndrome" results in: - ANSWER: ✔✔Loss of function at the level damaged due to
disruption of gray matter
Intraoperative evoked potential monitoring criteria of abnormality are based on a comparison of
amplitude and latency to - ANSWER: ✔✔Post incision baseline
The resting membrane potential is created by differences between the inside and outside of the cell in
ion concentrations of - ANSWER: ✔✔K+, Na+, & Cl-
It is most important for intraoperative monitoring records to include notations of - ANSWER:
✔✔Surgical events
The Nyquist frequency is - ANSWER: ✔✔Twice as great as the highest frequency
D waves are recorded from which of the following electrodes? - ANSWER: ✔✔Epidural electrodes over
the spinal cord
,Signal - to - noise ratio relates to which of the following? - ANSWER: ✔✔The amplitude of the evoked
response components to the amplitude of the unrelated components
Which of the following is the down going potential recorded at about 12 msec following stimulation of
the ear in the above diagram? - ANSWER: ✔✔Postauricular muscle reflex
Inflammation of the covering of the brain or spinal cord is called: - ANSWER: ✔✔Meningitis
The use of intraoperative monitoring during scoliosis surgery may replace the - ANSWER: ✔✔Romberg
test
P14 is a far field, sub cortically generated response which probably reflects - ANSWER: ✔✔Caudal
medial lemniscal activity
Scalp-to-noncephalic reference - ANSWER: ✔✔Fz-C5S
A post incision baseline recording is used to - ANSWER: ✔✔Establish a standard for the patient
The ulnar nerve is formed at spinal levels: - ANSWER: ✔✔C7-T1
Which of the following systolic blood pressures is most likely to attenuate the evoked potential? -
ANSWER: ✔✔120 mm/Hg
With a sampling rate of 10 kHz the shortest sine wave resolved would be - ANSWER: ✔✔0.2 msec
During a median nerve preoperative study, a patient has discomfort at the wrist. Stimulation electrodes
are 10 mm gold disk, stimulus intensity is 20 mA, and a stimulus duration is 100 usec. Which of the
following would most likely reduce the patient's discomfort while maintaining adequate stimulation? -
ANSWER: ✔✔Decrease number of repetitions
, To dissect a vestibular schwannoma, which surgical approach usually sacrifices hearing? - ANSWER:
✔✔Translabyrinthine
Exteroceptors and proprioceptors include all of the following except: - ANSWER: ✔✔Tectorial
membrane
Penetration of the sterile surgical field occurs when - ANSWER: ✔✔The surgeon's arm brushes against
the recording equipment
On the SSEP, the electrode at _____ records a spinal cord response. - ANSWER: ✔✔T12
Which of the following cranial nerves is most appropriate to monitor during resection of a 4 cm
vestibular schwannoma? - ANSWER: ✔✔Facial
Blood supply to the spinal cord: - ANSWER: ✔✔Is by an anterior spinal artery and two posterior spinal
arteries
In recording electrocochleograms it is best to stimulate using - ANSWER: ✔✔Rarefaction of
condensation clicks
The section of the brainstem that is continuous with the spinal cord and includes the decussation of the
pyramids, is the - ANSWER: ✔✔Medulla oblongata
The purpose of interbody cages is often to - ANSWER: ✔✔Restore lost disc height
The capacity to resolve amplitudes of 256 discrete steps would require an 8 bit A-to-D converter. This can
be represented by: - ANSWER: ✔✔2^8
An increase in stimulation intensity causes a linear increase of which of the following SSEP components?
- ANSWER: ✔✔P31
