CNIM apparently on the actual test questions and answers Latest 2024.
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CNIM
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CNIM
CNIM apparently on the actual test questions and answers Latest 2024.
CNIM apparently on the actual test
An increase in stimulation intensity causes a linear increase of which of the following SSEP components?
1. N20
2. N45
3. P31
4. P37 correct answer3. P31
Epidural electrodes are made of p...
CNIM apparently on the actual test questions and answers Latest 2024. CNIM apparently on the actual test An increase in stimulation intensity causes a linear increase of which of the following SSEP components? 1. N20 2. N45 3. P31 4. P37 correct answer3. 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 correct answer4. 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 correct answer2. 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 correct answer2. 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 correct answer3. 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 correct answer4. 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 correct answer4. 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 correct answer3. 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 correct answer3. 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 correct answer1. 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 correct answer3. 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 correct answer3. P31 Which of the following devices measures electrode resistance? 1. Ammeter 2. Ohmmeter 3. Voltmeter 4. Photometer correct answer2. 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
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