CNIM TEST with solutions
In BAEP's, cochlear nucleus lesion causes? - ANSWER: ✔✔Increased III-V, increased I-V
Which modality is most useful in monitoring the integrity of the corticospinal tracts during resection of
an intramedullary spinal cord tumor? - ANSWER: ✔✔D-Waves
The stimulus used in a brainstem auditory evoked potential study is a click with a peak acoustic power in
the range of - ANSWER: ✔✔2000 to 4000Hz
Which of the following tibial nerve responses is not a near field response? - ANSWER: ✔✔N31
How many amperes of current will flow in a circuit containing a 2V battery and 10 ohms of resistance? -
ANSWER: ✔✔0.2 amps
In BAEP's blood, betadine or irrigation fluid in tubing causes: - ANSWER: ✔✔Increase in absolute
latency, normal inter-peak latencies
In averaging, the period of analysis is called _______ or ________. - ANSWER: ✔✔Epoch, sweep length
While monitoring BAEP, there was a prolongation of wave I through V by more than 2 msec. Which of the
following choices is NOT a possible cause? - ANSWER: ✔✔Increase of isoflurane anesthesia
Involuntary movement - ANSWER: ✔✔Ataxia
Smaller surface of stimulating electrodes: - ANSWER: ✔✔Higher Current Density
During posterior fossa surgery, when BAEPs are used for monitoring brainstem function, it is most
important to: - ANSWER: ✔✔Stimulate and record from the contralateral side
,P100 of a VEP will have the highest amplitude in which derivation? - ANSWER: ✔✔MO-Fz
Cranial nerve VII must be monitored concurrently with BAERs. - ANSWER: ✔✔True
Nerves of the body, such as median, ulnar, and femoral are formed from the: - ANSWER: ✔✔Dorsal and
ventral rami
Upper motor neuron extends from: - ANSWER: ✔✔Precentral gyrus to ventral horn
Increasing the stimulus rate of BAEPs - ANSWER: ✔✔Decreases amplitude and increases latency
Which of the following is the normal interocular latency difference of P100? - ANSWER: ✔✔Less than 15
msec
An amplifier sensitivity setting that produces a vertical deflection of 1cm with an input of 10mV is: -
ANSWER: ✔✔1mV/mm
When identifying wave IV and V of a BAEP, which of the following would be most helpful? - ANSWER:
✔✔Cz-Contra ear montage
The maximum leakage current should be - ANSWER: ✔✔100 uA
Wave V is usually the most prominent peak after - ANSWER: ✔✔5.5 msec
Which of the following montages will best demonstrate waves I through V of the BAEP? - ANSWER:
✔✔Cz-ipsilateral ear
P13 Generator - ANSWER: ✔✔Spinomedullary junction
An electrode recording from Erb's point is placed - ANSWER: ✔✔2-3 cm above the clavicle
, In BAEP's, perforated or hardened tympanic membrane causes: - ANSWER: ✔✔Increase in absolute
latency, normal inter-peak latencies
Which of the following temperatures should be annotated as being hypothermic? - ANSWER: ✔✔34
degrees C
Dyskinesia: - ANSWER: ✔✔Abnormal Movement
Sensory supply of the posterior 1/3rd of the tongue is from which nerve? - ANSWER:
✔✔Glossopharyngeal
What is the best montage for distinguishing a IV/V complex? - ANSWER: ✔✔Cz-Contra Ear
Loss of a unilateral waveform is never a concern as long as wave V is present on the other ear. -
ANSWER: ✔✔False
Which of the following are thalamic nuclei for the somatosensory pathway? - ANSWER: ✔✔VPL nucleus
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
The effect of hypotension on the evoked potential is: - ANSWER: ✔✔Decreased amplitude, increased
latency
Using an amplification factor of 500,000, a 1uV brainstem auditory evoked potential waveform will be
amplified to - ANSWER: ✔✔0.50v
Which of the following monitoring modes is LEAST useful for skull base surgery? - ANSWER: ✔✔Tibial
nerve SSEP
In BAEP's, cochlear nucleus lesion causes? - ANSWER: ✔✔Increased III-V, increased I-V
Which modality is most useful in monitoring the integrity of the corticospinal tracts during resection of
an intramedullary spinal cord tumor? - ANSWER: ✔✔D-Waves
The stimulus used in a brainstem auditory evoked potential study is a click with a peak acoustic power in
the range of - ANSWER: ✔✔2000 to 4000Hz
Which of the following tibial nerve responses is not a near field response? - ANSWER: ✔✔N31
How many amperes of current will flow in a circuit containing a 2V battery and 10 ohms of resistance? -
ANSWER: ✔✔0.2 amps
In BAEP's blood, betadine or irrigation fluid in tubing causes: - ANSWER: ✔✔Increase in absolute
latency, normal inter-peak latencies
In averaging, the period of analysis is called _______ or ________. - ANSWER: ✔✔Epoch, sweep length
While monitoring BAEP, there was a prolongation of wave I through V by more than 2 msec. Which of the
following choices is NOT a possible cause? - ANSWER: ✔✔Increase of isoflurane anesthesia
Involuntary movement - ANSWER: ✔✔Ataxia
Smaller surface of stimulating electrodes: - ANSWER: ✔✔Higher Current Density
During posterior fossa surgery, when BAEPs are used for monitoring brainstem function, it is most
important to: - ANSWER: ✔✔Stimulate and record from the contralateral side
,P100 of a VEP will have the highest amplitude in which derivation? - ANSWER: ✔✔MO-Fz
Cranial nerve VII must be monitored concurrently with BAERs. - ANSWER: ✔✔True
Nerves of the body, such as median, ulnar, and femoral are formed from the: - ANSWER: ✔✔Dorsal and
ventral rami
Upper motor neuron extends from: - ANSWER: ✔✔Precentral gyrus to ventral horn
Increasing the stimulus rate of BAEPs - ANSWER: ✔✔Decreases amplitude and increases latency
Which of the following is the normal interocular latency difference of P100? - ANSWER: ✔✔Less than 15
msec
An amplifier sensitivity setting that produces a vertical deflection of 1cm with an input of 10mV is: -
ANSWER: ✔✔1mV/mm
When identifying wave IV and V of a BAEP, which of the following would be most helpful? - ANSWER:
✔✔Cz-Contra ear montage
The maximum leakage current should be - ANSWER: ✔✔100 uA
Wave V is usually the most prominent peak after - ANSWER: ✔✔5.5 msec
Which of the following montages will best demonstrate waves I through V of the BAEP? - ANSWER:
✔✔Cz-ipsilateral ear
P13 Generator - ANSWER: ✔✔Spinomedullary junction
An electrode recording from Erb's point is placed - ANSWER: ✔✔2-3 cm above the clavicle
, In BAEP's, perforated or hardened tympanic membrane causes: - ANSWER: ✔✔Increase in absolute
latency, normal inter-peak latencies
Which of the following temperatures should be annotated as being hypothermic? - ANSWER: ✔✔34
degrees C
Dyskinesia: - ANSWER: ✔✔Abnormal Movement
Sensory supply of the posterior 1/3rd of the tongue is from which nerve? - ANSWER:
✔✔Glossopharyngeal
What is the best montage for distinguishing a IV/V complex? - ANSWER: ✔✔Cz-Contra Ear
Loss of a unilateral waveform is never a concern as long as wave V is present on the other ear. -
ANSWER: ✔✔False
Which of the following are thalamic nuclei for the somatosensory pathway? - ANSWER: ✔✔VPL nucleus
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
The effect of hypotension on the evoked potential is: - ANSWER: ✔✔Decreased amplitude, increased
latency
Using an amplification factor of 500,000, a 1uV brainstem auditory evoked potential waveform will be
amplified to - ANSWER: ✔✔0.50v
Which of the following monitoring modes is LEAST useful for skull base surgery? - ANSWER: ✔✔Tibial
nerve SSEP
