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CNIM - Electrode Concepts Questions and Answers

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CNIM - Electrode Concepts Questions and Answers

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  • August 12, 2024
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  • 2024/2025
  • Exam (elaborations)
  • Questions & answers
  • CNIM
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CNIM - Electrode Concepts Questions and Answers

When placing stimulating electrodes over a peripheral nerve to stimulate a muscle
response: - ANSWER The negative electrode should be toward the peripheral
portion of the nerve to be stimulated.


When using monopolar stimulation for direct nerve stimulation... - ANSWER
The cathode electrode is connected to the negative terminal of the stimulator
output.


In monopolar facial nerve stim, positive charge flows... - ANSWER From anode
to cathode.


Ground electrodes for SSEP recordings... - ANSWER Are best placed between
stimulation and recording electrodes.


To minimize pain from stimulation during the recording of SSEPs, the contact
impedance of the stimulator should be... - ANSWER Less than 5,000 Ohms


Due to a smaller surface area, subdermal needle electrodes will have an
impedance that is... - ANSWER Higher than surface electrodes.


Epideral recordings are most affected by... - ANSWER Spinal Instrumentation


The most important consideration for mapping of near field high voltage gradient
signals is... - ANSWER Closely spaced electrodes

, Bipolar electrodes are used for localization of... - ANSWER Signals via phase
reversal


Epidural electrodes should be placed... - ANSWER Above the dura


For spinal cord monitoring using SSEPs, epidural electrodes should be placed... -
ANSWER Rostral to surgical site.


Loosely applied electrodes would cause... - ANSWER Increased noise in your
recording


Using dissimilar metals within an electrode montage will result in... - ANSWER
Electrode polarization


Electrode gel in between anode and cathode of the stimulating electrodes results
in... - ANSWER Salt bridge


For good recordings, you must have... - ANSWER High input impedence, low
electrode impedence


Needle electrodes should be sterilized with... - ANSWER Steam


What electrode should be used for facial nerve CMAP recording? - ANSWER
Surface

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