CNIM apparently on the actual test questions and
answers 2023 complete
An increase in stimulation intensity causes a linear increase of
which of the following SSEP components?
1. N20
2. N45
3. P31
4. P37 - 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 -
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
, CNIM apparently on the actual test questions and
answers 2023 complete
4. Decrease stimulus intensity below motor threshold - 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 - 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 - 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 - ANSWER--4. 20.00 msec
, CNIM apparently on the actual test questions and
answers 2023 complete
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 - 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 - 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 - ANSWER--3. Decreasing
stimulus intensity
In spinal surgery, the primary purpose of the popliteal fossa
recording electrode is to
1. Verify adequacy of stimulus
, CNIM apparently on the actual test questions and
answers 2023 complete
2. Limit current spread
3. Confirm amplifier integrity
4. Provide evidence of a muscle twitch - 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 - 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 - ANSWER--3. P31
Which of the following devices measures electrode resistance?
1. Ammeter
2. Ohmmeter
answers 2023 complete
An increase in stimulation intensity causes a linear increase of
which of the following SSEP components?
1. N20
2. N45
3. P31
4. P37 - 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 -
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
, CNIM apparently on the actual test questions and
answers 2023 complete
4. Decrease stimulus intensity below motor threshold - 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 - 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 - 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 - ANSWER--4. 20.00 msec
, CNIM apparently on the actual test questions and
answers 2023 complete
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 - 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 - 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 - ANSWER--3. Decreasing
stimulus intensity
In spinal surgery, the primary purpose of the popliteal fossa
recording electrode is to
1. Verify adequacy of stimulus
, CNIM apparently on the actual test questions and
answers 2023 complete
2. Limit current spread
3. Confirm amplifier integrity
4. Provide evidence of a muscle twitch - 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 - 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 - ANSWER--3. P31
Which of the following devices measures electrode resistance?
1. Ammeter
2. Ohmmeter
