CNIM -ELECRODE CONCEPTS TEST QUESTIONS
AND ANSWERS
When applying stimulating electrodes to a peripheral nerve to induce a muscle
ANSWER: - ANSWER The negative electrode should be oriented toward the
peripheral section of the nerve being stimulated.
When employing monopolar stimulation for direct nerve stimulation... -
ANSWER The cathode electrode is connected to the negative terminal of the
stimulator output.
In monopolar facial nerve stimulation, a positive charge passes from the anode
to the cathode.
Ground electrodes for SSEP recording... - ANSWER Are optimally positioned
between the stimulation and recording electrodes.
To reduce pain from stimulation while recording SSEPs, the contact impedance
of the stimulator should be... - ANSWER Less than 5000 Ohms.
Subdermal needle electrodes have a lower impedance because of their smaller
surface area. Higher than surface electrodes.
Spinal instrumentation has the greatest impact on epideral recordings.
The most critical concern when mapping near-field high voltage gradient
signals is... - ANSWER Closely spaced electrodes.
Bipolar electrodes are used to localize... - ANSWER Signals through phase
reversal.
Epidural electrodes should be positioned... - ANSWER Above the dura.
AND ANSWERS
When applying stimulating electrodes to a peripheral nerve to induce a muscle
ANSWER: - ANSWER The negative electrode should be oriented toward the
peripheral section of the nerve being stimulated.
When employing monopolar stimulation for direct nerve stimulation... -
ANSWER The cathode electrode is connected to the negative terminal of the
stimulator output.
In monopolar facial nerve stimulation, a positive charge passes from the anode
to the cathode.
Ground electrodes for SSEP recording... - ANSWER Are optimally positioned
between the stimulation and recording electrodes.
To reduce pain from stimulation while recording SSEPs, the contact impedance
of the stimulator should be... - ANSWER Less than 5000 Ohms.
Subdermal needle electrodes have a lower impedance because of their smaller
surface area. Higher than surface electrodes.
Spinal instrumentation has the greatest impact on epideral recordings.
The most critical concern when mapping near-field high voltage gradient
signals is... - ANSWER Closely spaced electrodes.
Bipolar electrodes are used to localize... - ANSWER Signals through phase
reversal.
Epidural electrodes should be positioned... - ANSWER Above the dura.
