CNIM Exam 3 Questions with 100% Correct Answers
During tibial nerve stimulation, a decreased nerve conduction velocity between the popliteal fossa and L3 potential, with normal NCV to the popliteal fossa indicates:
A- a normal pathway
B- a lesion between the popliteal fossa and caudal equina
...
CNIM Exam 3 Questions with 100%
Correct Answers
During tibial nerve stimulation, a decreased nerve conduction velocity between the
popliteal fossa and L3 potential, with normal NCV to the popliteal fossa indicates:
A- a normal pathway
B- a lesion between the popliteal fossa and caudal equina
C- a lesion between the ankle and popliteal fossa
D- that the extremity should be cooled and the study repeated - Answer- B- a lesion
between the popliteal fossa and caudal equina
Because generator sites are typically deep within anatomic structures, most EPs are
considered to be
How can one sometimes enhance the wave V amplitude?
A- Use condensation instead of rarefaction
B- Stimulate using a 4kHz tone pip
C- Increase rep. rate
D- Decrease sweep - Answer- A- Use condensation instead of rarefaction
What intravenous drug is used to maintain hypotension?
A- Decreased common mode rejection
B- Far field signals
C- Phase changes in instrument
D- Signals via phase reversal - Answer- D- Signals via phase reversal
A- does not always indicate a good surgical outcome
B- conclusively indicate preservation of function
C- indicates postoperative function of cranial nerve VIII
D- ensures motor activity of the jaw - Answer- A- does not always indicate a good
surgical outcome
In posterior fossa craniotomy surgery for a large tumor with unilateral hearing loss, the
appropriate modalities to monitor would be:
A- Ipsilateral BAEP and facial nerve
B- Contralateral BAEP, median nerve SSEP and facial nerve
C- Facial nerve and contralateral median nerve
D- Ipsilateral BAEP - Answer- B- Contralateral BAEP, median nerve SSEP and facial
nerve
The use of ER insert earphones results in:
A- Increased wave I amplitude
B- Separating wave I from the stimulus artifact
C- Lack of stimulating artifact
D- Shorter I-V interval - Answer- B- Separating wave I from the stimulus artifact
Hemispheric EEG changes may be caused by:
,A- Decreased blood pressure
B- Clamping of the internal carotid
C- Hypothermia
D- A bolus of narcotic - Answer- B- Clamping of the internal carotid
When is the latest acceptable time during a surgery to begin monitoring?
A- During surgical manipulation of neural structure
B- Before closure of the wound
C- Before any surgical manipulations which place neural structures at risk
D- After electrocautery ceases - Answer- C- Before any surgical manipulations which
place neural structures at risk
The earliest obligate component of the median nerve SSEP that is measured far-field is
generated in the
At the stage of surgical anesthesia, propofol affects the BAEP by
A- causing very minimal changes
B- decreasing the amplitude in all waveforms
C- increasing the latencies of waves I, III, and V without changing their amplitudes
D- abolishing all waveforms - Answer- C- increasing the latencies of waves I, III, and V
without changing their amplitudes
Microvascular decompression involves:
A- Lifting an artery off of a nerve
B- Clamping off the blood supply to a nerve
C- Relieving arterial stenosis
D- Eliminating an arteriovenous malformation - Answer- A- Lifting an artery off of a
nerve
The surgical procedure that would have the greatest risk for changes in cardiovascular
and respiratory efforts would
A- be temporal lobectomy
B- be the removal of an occipital tumor
C- be in the area of the posterior spinal segments
D- involve the posterior fossa - Answer- D- involve the posterior fossa
, Which of the following would most likely result in an increased I-III interval?
If the VIIIth nerve were transected, you would get
A- No change
B- Increased I-III latency
C- Loss of wave III - V
D- Absence of all waves I-V - Answer- D- Absence of all waves I-V
Epidural electrodes should be placed:
A- Inside the spinal cord
B- Between the dura and the spinal cord
C- Above the dura
D- Above the lamina - Answer- C- Above the dura
Early changes to CMAPs, during the exposure of CN VII, are most likely due to:
A- an increase in inhalation agents
B- severe blood loss
C- heating from the electrical cautery device
D- changes in the patient's state of consciousness - Answer- C- heating from the
electrical cautery device
During posterior fossa exploration for tic douloureaux, the monitoring of median nerve
SSEPs will demonstrate the:
A- location of the trigeminal nerve
B- effect of retractor placement on the cochlear and vestibular nerves
C- integrity of the somatosensory system traversing brainstem structures
D- integrity of the brainstem - Answer- C- integrity of the somatosensory system
traversing brainstem structures
The effect of severe hypotension on the evoked potential includes
A- a decrease in amplitude and variable changes in latency
B- variable changes in amplitude and an increase in latency
C- an increase in amplitude and a decrease in latency
D- a decrease in amplitude and an increase in latency - Answer- D- a decrease in
amplitude and an increase in latency
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