CNIM apparently on the actual test questions and answers 2023 complete
1. An increase in stimulation intensity causes a linear increase of which of the following SSEP components?
1. N20
2. N45
3. P31
4. P37: 3. P31
2. Epidural electrodes are made of platinum because
1. It is the most durable...
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: 3. P31
2.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: 4. Other metals may become toxic when currents are applied
3. 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 stimula- tion?
1.Increase stimulus duration
2.Use larger stimulating electrode
3.Use smaller stimulating electrode
4.Decrease stimulus intensity below motor threshold: 2. Use larger stimulating electrode
4. 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: 2. Increase the intensity
5.In BAEPs, wave I can most easily be differentiated from cochlear micro- phonics based upon
1.Amplitude
2.Morphology
3.Click polarity
4.Absence in contralateral recording: 3. Click polarity
6. What is the interstimulus interval of a 50 Hz click stimulus?
1.0.02 msec
2.0.20 msec CNIM apparently on the actual test questions and answers
2023 complete
.0.50 msec
4. 20.00 msec: 4. 20.00 msec
7. 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: 4. Prevent crossover responses
8. 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: 3. Severe hearing loss
9. 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: 3. Decreasing stimulus intensity
10. 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: 1. Verify adequacy of stimulus
11. while performing a posterior tibial SSEP, hypothermia of the lower ex- tremities 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: 3. Slowed peripheral con- duction velocity
12.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: 3. P31 CNIM apparently on the actual test questions and answers
2023 complete
.Which of the following devices measures electrode resistance?
1.Ammeter
2.Ohmmeter
3.Voltmeter
4.Photometer: 2. Ohmmeter
14.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: 3. 2:1
15.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: 2. Waveform polarity and polarity convention of the amplifier inputs
16.If an amplifier is rated as having 120 dB common mode rejection
ratio, which of the following ratios of in-phase to out-of-phase signals
would be expected?
1. 10,000:1
2. 100,000:1
3. 500,000:1
4. 1,000,000:1: 4. 1,000,000:1
17.Which of the following cranial nerves innervated the extraocular mus- cles?
1.Optic
2.Facial
3.Abducens
4.Trigeminal: 3. Abducens
18. Which of the following is an example of an SSEP far-field subcortical potential?
1. N20
2. N34
3.Erbs point
4.Popliteal fossa: 2. N34 CNIM apparently on the actual test questions and answers
2023 complete
. Which of the following opposes any change in current?
1.Capacitance
2.Impedance
3.Inductance
4.Resistance: 3. Inductance
20. Which of the following electrode materials has little electrode potential drift and a long time constant?
1.Tin
2.Gold
3.Silver
4.Stainless steel: 2. Gold
21. Where should epidural electrodes be placed?
1.On the dura
2.In the spinal cord
3.Within the dural memebrane
4.Between the dura and the spinal cord: 1. On the dura
22. With referential recording, maximal amplitude cortical evoked
potentials following stimulation of the left posterior tibial nerve usually
would be found between
1.C3 and Cz
2.C4 and P4
3.Fz and Cz
4.C4 and Cz: 1. C3 and Cz
23. For preoperative posterior tibial somatosensory evoked potentials, which of the following would be the best ipsilateral location for the ground elec- trode?
1.Arm
2.Calf
3.Mastoid
4.Sole of the foot: 2. Calf
24. To record the afferent volley after posterior tibial nerve stimulation, an electrode should be placed on the
1.Patella
2.Metatarsal
3.Popliteal fossa
4.Medial malleolus: 3. Poplilteal fossa
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