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CNIM TEST QUESTIONS AND ANSWERS

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CNIM TEST QUESTIONS AND ANSWERS

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  • August 17, 2024
  • 16
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers
  • CNIM
  • CNIM
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GEEKA
CNIM TEST QUESTIONS AND ANSWERS
In BAEP's, cochlear nucleus lesion causes? - Answers -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? - Answers -D-Waves

The stimulus used in a brainstem auditory evoked potential study is a click with a peak
acoustic power in the range of - Answers -2000 to 4000Hz

Which of the following tibial nerve responses is not a near field response? - Answers -
N31

How many amperes of current will flow in a circuit containing a 2V battery and 10 ohms
of resistance? - Answers -0.2 amps

In BAEP's blood, betadine or irrigation fluid in tubing causes: - Answers -Increase in
absolute latency, normal inter-peak latencies

In averaging, the period of analysis is called _______ or ________. - Answers -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? - Answers -Increase of
isoflurane anesthesia

Involuntary movement - Answers -Ataxia

Smaller surface of stimulating electrodes: - Answers -Higher Current Density

During posterior fossa surgery, when BAEPs are used for monitoring brainstem
function, it is most important to: - Answers -Stimulate and record from the contralateral
side

P100 of a VEP will have the highest amplitude in which derivation? - Answers -MO-Fz

Cranial nerve VII must be monitored concurrently with BAERs. - Answers -True

Nerves of the body, such as median, ulnar, and femoral are formed from the: - Answers
-Dorsal and ventral rami

Upper motor neuron extends from: - Answers -Precentral gyrus to ventral horn

Increasing the stimulus rate of BAEPs - Answers -Decreases amplitude and increases
latency

,Which of the following is the normal interocular latency difference of P100? - Answers -
Less than 15 msec

An amplifier sensitivity setting that produces a vertical deflection of 1cm with an input of
10mV is: - Answers -1mV/mm

When identifying wave IV and V of a BAEP, which of the following would be most
helpful? - Answers -Cz-Contra ear montage

The maximum leakage current should be - Answers -100 uA

Wave V is usually the most prominent peak after - Answers -5.5 msec

Which of the following montages will best demonstrate waves I through V of the BAEP?
- Answers -Cz-ipsilateral ear

P13 Generator - Answers -Spinomedullary junction

An electrode recording from Erb's point is placed - Answers -2-3 cm above the clavicle

In BAEP's, perforated or hardened tympanic membrane causes: - Answers -Increase in
absolute latency, normal inter-peak latencies

Which of the following temperatures should be annotated as being hypothermic? -
Answers -34 degrees C

Dyskinesia: - Answers -Abnormal Movement

Sensory supply of the posterior 1/3rd of the tongue is from which nerve? - Answers -
Glossopharyngeal

What is the best montage for distinguishing a IV/V complex? - Answers -Cz-Contra Ear

Loss of a unilateral waveform is never a concern as long as wave V is present on the
other ear. - Answers -False

Which of the following are thalamic nuclei for the somatosensory pathway? - Answers -
VPL nucleus

What does an increased N13-N20 central conduction time with normal N9-N20
conduction time and a normal nerve conduction velocity indicate? - Answers -Defect
above the lower medulla at or below the somatosensory cortex

The effect of hypotension on the evoked potential is: - Answers -Decreased amplitude,
increased latency

, Using an amplification factor of 500,000, a 1uV brainstem auditory evoked potential
waveform will be amplified to - Answers -0.50v

Which of the following monitoring modes is LEAST useful for skull base surgery? -
Answers -Tibial nerve SSEP

Which surgical approach will sacrifice hearing? - Answers -Translabyrinthine

Which muscle is innervated by L4-S1 nerve roots? - Answers -Tibialis anterior

Selective dorsal rhizotomy: - Answers -Reduces spasticity

The fibers anterior to the chiasm in the visual pathway are called: - Answers -Optic
nerves

During posterior fossa surgery, wave V of the BAEPs may increase in latency due to: -
Answers -Retraction of the cerebellum

When is it most appropriate to alert the surgical team of a problem with the monitoring?
- Answers -After a loss of 55% amplitude

If the distance between a patient and a pattern generator is reduced by one-half, the
angle at the eye subtended by each check is - Answers -Increased two times

In VEP we are testing ___________ vision, not ____________ vision. - Answers -
Central, periphial

Posterior Fossa - Answers -Brainstem

EEG electrodes during IONM should have impedances that range from: - Answers -
1000 to 5000 ohms

All components of brainstem auditory evoked potential waveforms reach adult
configuratiion by what age? - Answers -3-6 months

Which of the following evoked potential tests would have the lowest rate of abnormality
in patients with MS? - Answers -BAEP

Where do the optic tracts terminate and relay the visual impulses to the visual cortex? -
Answers -Lateral geniculate body

Why do we use electrodes made out of the same material? - Answers -To prevent
polarization

In ABR stimulation, the stimulus type which causes a negative pressure resulting in a
slightly earlier latency is - Answers -Rarefaction

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