1|Page
CNIM TEST EXAM|| CNIM EXAM ALL QUESTIONS
AND CORRECT ANSWERS ALREADY GRADED
A+|| LATEST UPDATE 2024 WITH VERIFIED
SOLUTIONS|| COMPLETE GUIDE ASSURED PASS!!!
Which of the following is a reason why a "false-negative" could occur? -
ANSWER: The lesion occurs in a structure not involved in the pathway being
monitored
The amplitude of the cortical response to posterior tibial SEP stimulation is at least
80% attenuated by - ANSWER: stimulation rates of 15 per second or higher
In a patient with hematocrit below 10%, the SSEP waveforms will - ANSWER:
increase in latency and decrease in amplitude
It is important to begin monitoring EEG early during a carotid endarterectomy -
ANSWER: to record the EEG before anesthesia and after induction for
comparison during the case
With a sampling rate of 10 kHz the shortest sine wave resolved would be -
ANSWER: 0.2 msec
Which of the following are acceptable filter settings for recording BAEPs: -
ANSWER: 100 - 2500 Hz
Evoked potential systems must be calibrated a MINIMUM of once every: -
ANSWER: Six months
,2|Page
Spinal cord evoked potentials are best recorded using a low-frequency filter setting
of 100 Hz. This setting is preferred because, relative to cortical somatosensory
evoked potentials, spinal cord potentials are: - ANSWER: of relatively short
duration
Cathode - ANSWER: Negative pole or block dot on the bar electrode
Bipolar electrodes are used for localization of: - ANSWER: Signals via phase
reversal
Loss of BAEPs following drilling of the internal auditory canal is most likely due
to: - ANSWER: Disruption of the cochlear blood supply
What electrode should be used for facial nerve CMAP recording? - ANSWER:
Surface
Subdermal needle electrodes must be inserted symmetrically over homologous
brain areas to avoid: - ANSWER: artificial amplitude asymmetries
If the ear canal is occluded, you may expect: - ANSWER: Prolongation of all
wave latencies
If unavoidable muscle artifact is present in the BAEP you can change the locut
filter to: - ANSWER: 200 Hz
Which of the following is effective at the lowest concentration? - ANSWER:
Isoflurane
Epidural electrodes should be placed: - ANSWER: Above the dura
,3|Page
For peroneal nerve stimulation, the ground should be placed on: - ANSWER: The
thigh
Which of the following peaks will be most affected by Desflurane? - ANSWER:
P100
An optimal rep.rate for BAEP's is: - ANSWER: 31 Hz
Which montage would you use to confirm a change in the CPz-Fpz cortical
response to PTN Stim ? - ANSWER: CPi-CPz
A major advantage of digital filters over analog filters is: - ANSWER: They
impose no phase effects on the recorded signal
Which of electrode is regarded as an effective stimulator during facial nerve
recordings: - ANSWER: Bipolar concentric EMG needle
Which time constant of a locut filter would be most effective for cutting out low
frequency noise from your signal? - ANSWER: 10 ms
The input impedance of a differential amplifier should be: - ANSWER: At least
100,000,000 ohms
What will be the frequency of a signal if in a 30 msec sweep the interval between
each cycle of the signal is 0.03 msec? - ANSWER: 33 KHz
, 4|Page
What is the initial event that occurs when the action potential threshold of a neuron
is reached? - ANSWER: Voltage-gated Sodium channels open
Lower motor neurons primarily exit the spinal cord through: - ANSWER: The
ventral nerve roots
A positive Babinski reflex could indicate: - ANSWER: Severe spinal cord trauma
After-discharges occur after what? - ANSWER: Direct cortical stimulation
Cotrel-Dubousset instrumentation involves which of the following as a primary
corrective maneuver? - ANSWER: Derotation
What is the maximum allowable leakage current from the isolated amplifier inputs
through the patient leads? - ANSWER: 10 uA
Random spike discharges can be heard from a speaker during facial nerve
dissection in all of the following except: - ANSWER: During electrocautery
The positive input of a differential amplifier is also called the - ANSWER: Non-
inverting input
Cranial nerve X can be monitored using electrodes inserted into the: - ANSWER:
Vocalis muscle
Microvascular decompression involves: - ANSWER: Lifting an artery off of the
nerve
CNIM TEST EXAM|| CNIM EXAM ALL QUESTIONS
AND CORRECT ANSWERS ALREADY GRADED
A+|| LATEST UPDATE 2024 WITH VERIFIED
SOLUTIONS|| COMPLETE GUIDE ASSURED PASS!!!
Which of the following is a reason why a "false-negative" could occur? -
ANSWER: The lesion occurs in a structure not involved in the pathway being
monitored
The amplitude of the cortical response to posterior tibial SEP stimulation is at least
80% attenuated by - ANSWER: stimulation rates of 15 per second or higher
In a patient with hematocrit below 10%, the SSEP waveforms will - ANSWER:
increase in latency and decrease in amplitude
It is important to begin monitoring EEG early during a carotid endarterectomy -
ANSWER: to record the EEG before anesthesia and after induction for
comparison during the case
With a sampling rate of 10 kHz the shortest sine wave resolved would be -
ANSWER: 0.2 msec
Which of the following are acceptable filter settings for recording BAEPs: -
ANSWER: 100 - 2500 Hz
Evoked potential systems must be calibrated a MINIMUM of once every: -
ANSWER: Six months
,2|Page
Spinal cord evoked potentials are best recorded using a low-frequency filter setting
of 100 Hz. This setting is preferred because, relative to cortical somatosensory
evoked potentials, spinal cord potentials are: - ANSWER: of relatively short
duration
Cathode - ANSWER: Negative pole or block dot on the bar electrode
Bipolar electrodes are used for localization of: - ANSWER: Signals via phase
reversal
Loss of BAEPs following drilling of the internal auditory canal is most likely due
to: - ANSWER: Disruption of the cochlear blood supply
What electrode should be used for facial nerve CMAP recording? - ANSWER:
Surface
Subdermal needle electrodes must be inserted symmetrically over homologous
brain areas to avoid: - ANSWER: artificial amplitude asymmetries
If the ear canal is occluded, you may expect: - ANSWER: Prolongation of all
wave latencies
If unavoidable muscle artifact is present in the BAEP you can change the locut
filter to: - ANSWER: 200 Hz
Which of the following is effective at the lowest concentration? - ANSWER:
Isoflurane
Epidural electrodes should be placed: - ANSWER: Above the dura
,3|Page
For peroneal nerve stimulation, the ground should be placed on: - ANSWER: The
thigh
Which of the following peaks will be most affected by Desflurane? - ANSWER:
P100
An optimal rep.rate for BAEP's is: - ANSWER: 31 Hz
Which montage would you use to confirm a change in the CPz-Fpz cortical
response to PTN Stim ? - ANSWER: CPi-CPz
A major advantage of digital filters over analog filters is: - ANSWER: They
impose no phase effects on the recorded signal
Which of electrode is regarded as an effective stimulator during facial nerve
recordings: - ANSWER: Bipolar concentric EMG needle
Which time constant of a locut filter would be most effective for cutting out low
frequency noise from your signal? - ANSWER: 10 ms
The input impedance of a differential amplifier should be: - ANSWER: At least
100,000,000 ohms
What will be the frequency of a signal if in a 30 msec sweep the interval between
each cycle of the signal is 0.03 msec? - ANSWER: 33 KHz
, 4|Page
What is the initial event that occurs when the action potential threshold of a neuron
is reached? - ANSWER: Voltage-gated Sodium channels open
Lower motor neurons primarily exit the spinal cord through: - ANSWER: The
ventral nerve roots
A positive Babinski reflex could indicate: - ANSWER: Severe spinal cord trauma
After-discharges occur after what? - ANSWER: Direct cortical stimulation
Cotrel-Dubousset instrumentation involves which of the following as a primary
corrective maneuver? - ANSWER: Derotation
What is the maximum allowable leakage current from the isolated amplifier inputs
through the patient leads? - ANSWER: 10 uA
Random spike discharges can be heard from a speaker during facial nerve
dissection in all of the following except: - ANSWER: During electrocautery
The positive input of a differential amplifier is also called the - ANSWER: Non-
inverting input
Cranial nerve X can be monitored using electrodes inserted into the: - ANSWER:
Vocalis muscle
Microvascular decompression involves: - ANSWER: Lifting an artery off of the
nerve
