CNIM
CNIM PRACTICE EXAM 1 QUESTIONS AND ANSWERS
Cotrel-Dubousset instrumentation involves which of the following as a primary
corrective maneuver?
Sublaminar wires
Derotation
Distraction
Intervertebral diskectomy - correct answer Derotation
How should needle electrodes be discarded?
It doesn't matter as long as they are not contaminated with blood
Carefully discarded in a plastic or metal trash can
Only in a red puncture-proof sharps container
Toss onto the OR floor. Housekeeping will sweep it up - correct answer Only in a red
puncture-proof sharps container
,CNIM
What is the period of a 200 Hz signal?
200 mS
50 mS
5 mS
2 mS - correct answer 5 mS
Which one of the following is an excitatory neurotransmitter?
GABA
Glutamate
Glycine
Phenylalanine - correct answer Glutamate
Which of the following is most likely associated with abnormal posterior tibial
SEPs?
Romberg sign
Anterior cord syndrome
Meniere's disease
Homonymous hemianopsia - correct answer Romberg sign
A 60 Hz notch filter should not be used for evoked potential recording because of:
The ringing artifact that comes from distortion of the stimulus artifact
,CNIM
Aliasing of the signal by the filter
60 Hz interference coming from various OR equipment
Common mode rejection of 60 Hz prior to filtering - correct answer The ringing
artifact that comes from distortion of the stimulus artifact
Cranial nerve IV can be monitored using electrodes inserted into the:
Lateral rectus
Inferior oblique
Superior oblique
Trochlea - correct answer Superior oblique
What is the advantage to using an insulated bipolar electrode for intracranial facial
nerve stimulation?
Prevent burn to surgeon's hand
Prevent cranial nerve from damage
Prevent current shunting to other cranial nerves
Required by JCAHO - correct answer Prevent current shunting to other cranial
nerves
Which of electrode is regarded as an effective stimulator during facial nerve
recordings:
Silver disk electrode
, CNIM
Spinal epidural electrodes
Bipolar concentric EMG needle
Nasopharyngeal probe - correct answer Bipolar concentric EMG needle
Which one of the following is an inhibitory neurotransmitter?
GABA
Serotonin
Dopamine
Phenylalanine - correct answer GABA
Decrease in cortical PTN responses with preservation of subcortical responses is
most often caused by:
Blood loss
Anesthesia
Spinal cord lesioning
Hypothermia - correct answer Anesthesia
Which of the following responses increases linearly with an increase in stimulus
intensity?
Popliteal fossa
VEP
PTN cortical
CNIM PRACTICE EXAM 1 QUESTIONS AND ANSWERS
Cotrel-Dubousset instrumentation involves which of the following as a primary
corrective maneuver?
Sublaminar wires
Derotation
Distraction
Intervertebral diskectomy - correct answer Derotation
How should needle electrodes be discarded?
It doesn't matter as long as they are not contaminated with blood
Carefully discarded in a plastic or metal trash can
Only in a red puncture-proof sharps container
Toss onto the OR floor. Housekeeping will sweep it up - correct answer Only in a red
puncture-proof sharps container
,CNIM
What is the period of a 200 Hz signal?
200 mS
50 mS
5 mS
2 mS - correct answer 5 mS
Which one of the following is an excitatory neurotransmitter?
GABA
Glutamate
Glycine
Phenylalanine - correct answer Glutamate
Which of the following is most likely associated with abnormal posterior tibial
SEPs?
Romberg sign
Anterior cord syndrome
Meniere's disease
Homonymous hemianopsia - correct answer Romberg sign
A 60 Hz notch filter should not be used for evoked potential recording because of:
The ringing artifact that comes from distortion of the stimulus artifact
,CNIM
Aliasing of the signal by the filter
60 Hz interference coming from various OR equipment
Common mode rejection of 60 Hz prior to filtering - correct answer The ringing
artifact that comes from distortion of the stimulus artifact
Cranial nerve IV can be monitored using electrodes inserted into the:
Lateral rectus
Inferior oblique
Superior oblique
Trochlea - correct answer Superior oblique
What is the advantage to using an insulated bipolar electrode for intracranial facial
nerve stimulation?
Prevent burn to surgeon's hand
Prevent cranial nerve from damage
Prevent current shunting to other cranial nerves
Required by JCAHO - correct answer Prevent current shunting to other cranial
nerves
Which of electrode is regarded as an effective stimulator during facial nerve
recordings:
Silver disk electrode
, CNIM
Spinal epidural electrodes
Bipolar concentric EMG needle
Nasopharyngeal probe - correct answer Bipolar concentric EMG needle
Which one of the following is an inhibitory neurotransmitter?
GABA
Serotonin
Dopamine
Phenylalanine - correct answer GABA
Decrease in cortical PTN responses with preservation of subcortical responses is
most often caused by:
Blood loss
Anesthesia
Spinal cord lesioning
Hypothermia - correct answer Anesthesia
Which of the following responses increases linearly with an increase in stimulus
intensity?
Popliteal fossa
VEP
PTN cortical
