Exam (elaborations)
CNIM FINAL EXAM AND PRACTICE EXAM
- Course
- Institution
- Book
CNIM FINAL EXAM AND PRACTICE EXAM
[Show more]
Connected book
Book Title:
Author(s):
- Edition:
- ISBN:
- Edition:
More summaries for
-
CNIM FINAL EXAM AND PRACTICE EXAM
Seller
Follow
tutorsection009
Reviews received
Content preview
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
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller tutorsection009. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $17.99. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
83750 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now