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CNIM FINAL EXAM AND PRACTICE EXAM
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CNIM FINAL EXAM AND PRACTICE EXAM
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CNIM FINAL EXAM AND PRACTICE EXAM LATEST ACTUALEXAM
Facial nerve EMG responses are best recorded from - ANSWER: orbicularis oris and
orbicularis oculi muscles
What intravenous drug is used to maintain hypotension? - ANSWER: Nutroprusside
At the stage of surgical anesthesia, propofol affects the BAEP by - ANSWER:
increasing the latencies of waves I, III, and V without changing their amplitudes
If you have a signal to noise ratio of 1:2, averaging 64 responses will: - ANSWER:
improve the ratio to 4:1
The central conduction time for MN SSEP is: - ANSWER: P14 - N20
Spinal cord ischemia during aortic surgery is best detected by changes in the -
ANSWER: posterior tibial nerve somatosensory evoked potential
At the end of an acoustic neuroma surgery, you would test the facial nerve by
stimulating: - ANSWER: Proximal to the site of the tumor
In the operating room, the stimulus intensity for activating a sensory nerve: -
ANSWER: does not have an established boundary
The effects of pharmacological or surgical manipulations can be mimicked by the
inappropriate manipulation of: - ANSWER: filter settings
Eliciting a motor twitch with PTN stimulation, you expect to see: - ANSWER: Plantar
flexion of the toes
What would be the effect of fluid in the external auditory canal? - ANSWER: Increase
of absolute latencies
Early changes to CMAPs, during the exposure of CN VII, are most likely due to -
ANSWER: heating from the electrical cautery device
During microvascular decompression surgery to relieve a hemifacial spasm -
ANSWER: a stimulation of CN VII elicits a response from the mentalis muscle
Of the following, the peak equivalent SPL of a click should be calibrated at: -
ANSWER: 1000 Hz
An unstable blood pressure during SSEP monitoring in the OR affects cortical EPs
resulting in - ANSWER: fluctuating amplitudes
,Multiple sclerosis, spinal cord injury, and brain trauma can lead to debilitating
spasticity that has been relieved in some patients following: - ANSWER: selective
dorsal rhizotomy
If a 10 microvolt signal inside 50 microvolts of noise is averaged for 100 traces, the
final signal to noise ratio will be: - ANSWER: 2:1
A patient in a state of surgical anesthesia using nitrous oxide is likely to have a drop
in SSEP amplitudes of - ANSWER: 0.75
What is the minimum bandpass filter for an evoked potential system? - ANSWER:
0.1-5000 Hz
A patient is admitted to the operating room diagnosed with a burst fracture of the
first lumbar vertebra. The most appropriate nerve(s) to monitor would be the: -
ANSWER: posterior tibial and ulnar nerves
If a sound intensity is decreased from 80 dB to 60 dB then the sound pressure has
been decreased by a factor of: - ANSWER: 10
The term "broadband click" refers to a - ANSWER: peak acoustic power of 2 - 4 kHz
What is a rhizotomy? - ANSWER: A procedure to selectively destroy problematic
nerve roots
If you receive a shock from the system console, the first thing you should do is: -
ANSWER: Disconnect the patient
What is the best montage to use to evaluate dorsal column activity? - ANSWER: Cs5-
EPc
The earliest obligate component of the median nerve SSEP that is measured far-field
is generated in the: - ANSWER: Medial lemniscus
Preservation of facial nerve CMAPs - ANSWER: does not always indicate a good
surgical outcome
The purpose of preoperative evoked potential testing is to: - ANSWER: Compare to
post-induction responses
The purpose of isolated amplifier inputs is to: - ANSWER: prevent a flow of stray
currents through connecting lines to the patient
A secure method for applying surface cup electrodes requires: - ANSWER: collodion
and compressed air
, Nyquist Frequency - ANSWER: Minimum sampling rate to prevent aliasing
What is the MINIMUM acceptable sweep for BAEPs - ANSWER: 10 msec
Of those patients who demonstrate significant EEG changes following cross clamping
of the carotid, the majority of changes will occur within: - ANSWER: 20 seconds
Using dissimilar metals within an electrode montage will result in: - ANSWER:
Electrode polarization
Brain activity recorded directly from the cortex (ECoG) is very high in amplitude and
usually requires sensitivities in the range of - ANSWER: 40 to 100 µV/mm
Reusable needle electrodes should be sterilized with: - ANSWER: Steam
Which response depends most highly on the precision of electrode placement on the
scalp? - ANSWER: P37 of the PTN SSEP
Intraoperative baseline recordings in somatosensory evoked potentials are best
acquired - ANSWER: in the positioned, induced patient
PTN SSEP responses will be most likely affected if the patient has: - ANSWER: Ataxia
What is ataxia? - ANSWER: the loss of full control of bodily movements and balance
Which of the following is a reason why a "false-negative" could occur? - ANSWER:
The lesion occurs in a structure not involved in the pathway being monitored
The amplitude of the cortical response to posterior tibial SEP stimulation is at least
80% attenuated by - ANSWER: stimulation rates of 15 per second or higher
In a patient with hematocrit below 10%, the SSEP waveforms will - ANSWER:
increase in latency and decrease in amplitude
It is important to begin monitoring EEG early during a carotid endarterectomy -
ANSWER: to record the EEG before anesthesia and after induction for comparison
during the case
With a sampling rate of 10 kHz the shortest sine wave resolved would be - ANSWER:
0.2 msec
Which of the following are acceptable filter settings for recording BAEPs: - ANSWER:
100 - 2500 Hz
Evoked potential systems must be calibrated a MINIMUM of once every: - ANSWER:
Six months
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