CNIM APPARENTLY ON THE ACTUAL TEST EXAM |VERIFIED|ACCURATE ANSWERS
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CNIM APPARENTLY ON THE ACTUAL
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CNIM APPARENTLY ON THE ACTUAL
CNIM APPARENTLY ON THE ACTUAL TEST EXAM
CNIM APPARENTLY ON THE ACTUAL TEST EXAM |VERIFIED|ACCURATE ANSWERS
An increase in stimulation intensity causes a linear increase of which of the following SSEP components?
1. N20
2. N45
3. P31
4. P37 - Accurate Answer3. P31
Epidural electrodes a...
CNIM APPARENTLY ON THE ACTUAL
TEST EXAM
CNIM APPARENTLY ON THE ACTUAL TEST EXAM |VERIFIED|ACCURATE ANSWERS
An increase in stimulation intensity causes a linear increase of which of the following SSEP
components?
1. N20
2. N45
3. P31
4. P37 - Accurate Answer✅✅3. P31
Epidural electrodes are made of platinum because
1. It is the most durable metal
2. It is the lowest impedance metal
3. The chance of allergic reaction is eliminated
4. Other metals may become toxic when currents are applied - Accurate Answer✅✅4. Other
metals may become toxic when currents are applied
,During a median nerve preoperative study, a patient has discomfort at the wrist. Stimulation
electrodes are 10 mm gold disk, stimulus intensity is 20 mA, and stimulus duration is 100 usec.
Which of the following would most likely reduce the patients discomfort while maintaining
adequate stimulation?
1. Increase stimulus duration
2. Use larger stimulating electrode
3. Use smaller stimulating electrode
4. Decrease stimulus intensity below motor threshold - Accurate Answer✅✅2. Use larger
stimulating electrode
Which of the following would enhance wave I of the BAEP?
1. Increase the rate
2. Increase the intensity
3. Decrease the analysis time
4. Decrease the number of repetitions - Accurate Answer✅✅2. Increase the intensity
In BAEPs, wave I can most easily be differentiated from cochlear microphonics based upon
1. Amplitude
2. Morphology
3. Click polarity
4. Absence in contralateral recording - Accurate Answer✅✅3. Click polarity
What is the interstimulus interval of a 50 Hz click stimulus?
1. 0.02 msec
2. 0.20 msec
3. 0.50 msec
4. 20.00 msec - Accurate Answer✅✅4. 20.00 msec
Contralateral masking should be used during BAEPs to
1. Help the patient relax
,2. Enhance wave I amplitude
3. Separate the IV/V complex
4. Prevent crossover responses - Accurate Answer✅✅4. Prevent crossover responses
The complete absence of a BAEP is most likely the result of
1. Sedation
2. Multiple sclerosis
3. Severe hearing loss
4. A normal age variant - Accurate Answer✅✅3. Severe hearing loss
Identification of wave V of the BAEP may require
1. Tympanic electrodes
2. Bilateral stimulation
3. Decreasing stimulus intensity
4. Use of a noncephalic reference - Accurate Answer✅✅3. Decreasing stimulus intensity
In spinal surgery, the primary purpose of the popliteal fossa recording electrode is to
1. Verify adequacy of stimulus
2. Limit current spread
3. Confirm amplifier integrity
4. Provide evidence of a muscle twitch - Accurate Answer✅✅1. Verify adequacy of stimulus
while performing a posterior tibial SSEP, hypothermia of the lower extremities is most likely to
cause
1. Increased L3-P37 latency
2. Increased T12-P37 latency
3. Slowed peripheral conduction velocity
4. Abnormal prolongation of the P37-N45 complex - Accurate Answer✅✅3. Slowed peripheral
conduction velocity
, Which of the following peaks in tibial nerve SSEPs is most analogous to P14 of median nerve
SSEP?
1. N20
2. N34
3. P31
4. P37 - Accurate Answer✅✅3. P31
Which of the following devices measures electrode resistance?
1. Ammeter
2. Ohmmeter
3. Voltmeter
4. Photometer - Accurate Answer✅✅2. Ohmmeter
If an evoked potential has a voltage of 10 uV and the associated noise has a voltage of 50 uV,
what is the signal-to-noise ratio after 100 averaged responses?
1. 1:1
2. 1:2
3. 2:1
4. 5:1 - Accurate Answer✅✅3. 2:1
To display median nerve SSEP response as an upward deflection, which of the following must be
known?
1. Waveform polarity and latency of the response
2. Waveform polarity and polarity convention of the amplifier inputs
3. Polarity convention of amplifier inputs and amplitude of the response
4. Latency of the response and polarity convention of the amplifier inputs - Accurate
Answer✅✅2. Waveform polarity and polarity convention of the amplifier inputs
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