CNIM TEST EXAM QUESTIONS AND CORRECT ANSWERS LATEST UPDATE
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Cnim
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Cnim
In BAEP's, cochlear nucleus lesion causes? - CORRECT 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? - CORRECT D-Waves
The stimulus used in a brainstem auditory ev...
Which modality is most useful in monitoring the integrity of the corticospinal tracts during resection of
an intramedullary spinal cord tumor? - CORRECT D-Waves
The stimulus used in a brainstem auditory evoked potential study is a click with a peak acoustic power in
the range of - CORRECT 2000 to 4000Hz
Which of the following tibial nerve responses is not a near field response? - CORRECT N31
How many amperes of current will flow in a circuit containing a 2V battery and 10 ohms of resistance? -
CORRECT 0.2 amps
In BAEP's blood, betadine or irrigation fluid in tubing causes: - CORRECT Increase in absolute latency,
normal inter-peak latencies
In averaging, the period of analysis is called or . - CORRECT 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? - CORRECT Increase of isoflurane anesthesia
Involuntary movement - CORRECT Ataxia
Smaller surface of stimulating electrodes: - CORRECT Higher Current Density
During posterior fossa surgery, when BAEPs are used for monitoring brainstem function, it is most
important to: - CORRECT Stimulate and record from the contralateral side
,P100 of a VEP will have the highest amplitude in which derivation? - CORRECT MO-Fz
Cranial nerve VII must be monitored concurrently with BAERs. - CORRECT True
Nerves of the body, such as median, ulnar, and femoral are formed from the: - CORRECT Dorsal and
ventral rami
Upper motor neuron extends from: - CORRECT Precentral gyrus to ventral horn
Increasing the stimulus rate of BAEPs - CORRECT Decreases amplitude and increases latency
Which of the following is the normal interocular latency difference of P100? - CORRECT Less than 15 msec
An amplifier sensitivity setting that produces a vertical deflection of 1cm with an input of 10mV is: -
CORRECT 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 - CORRECT 100 uA
Wave V is usually the most prominent peak after - CORRECT 5.5 msec
Which of the following montages will best demonstrate waves I through V of the BAEP? - ANSWER:
✔✔Cz-ipsilateral ear
P13 Generator - CORRECT Spinomedullary junction
An electrode recording from Erb's point is placed - CORRECT 2-3 cm above the clavicle
, In BAEP's, perforated or hardened tympanic membrane causes: - CORRECT Increase in absolute latency,
normal inter-peak latencies
Which of the following temperatures should be annotated as being hypothermic? - CORRECT 34 degrees C
Dyskinesia: - CORRECT 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? - CORRECT 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? - CORRECT VPL nucleus
What does an increased N13-N20 central conduction time with normal N9-N20 conduction time and a
normal nerve conduction velocity indicate? - CORRECT Defect above the lower medulla at or below the
somatosensory cortex
The effect of hypotension on the evoked potential is: - CORRECT Decreased amplitude, increased latency
Using an amplification factor of 500,000, a 1uV brainstem auditory evoked potential waveform will be
amplified to - CORRECT 0.50v
Which of the following monitoring modes is LEAST useful for skull base surgery? - CORRECT Tibial nerve
SSEP
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