CNIM Test V- Questions with correct Answers

5-136 At what rate do skin cells exfoliate from OR personnel? A- 10,000 cells per hour B- 20,000 cells per hour C- 50,000 cells per hour D- 30,000 cells per hour - Answer- C- 50,000 cells per hour 5-214 When is it most appropriate to alert the surgeon of a problem with the monitoring? A- When any change occurs B- After a loss of 30% and 5% latency C- After all waveforms are lost D- After a loss of 55% amplitude - Answer- D- After a loss of 55% amplitude 5-152 After 100 averages, you have a signal to noise ratio of 2:1. How many averages would it take to increase the signal to noise ratio to 15:1? A- 10000 B- 5625 C- 900 D- 225 - Answer- B- 5625 Your evoked potential is squaring on the screen. Which of the following will best address this problem? A- Increase sensitivity to 100 uV/div B- Decrease sensitivity to 25 uV/div C- Increase sensitivity to 25 uV/div D- Decrease sensitivity to 100 uV/div - Answer- D- Decrease sensitivity to 100 uV/div Which of the following is most likely to cause a false negative for a thoracolumbar fusion? A- Bilateral asynchronous stimulation of sural nerve B- Bilateral asynchronous stimulation of posterior tibial nerve C- Bilateral synchronous stimulation of posterior tibial nerve D- Bilateral asynchronous stimulation of peroneal nerve - Answer- C- Bilateral synchronous stimulation of posterior tibial nerve What is the recommended impedance of surface electrodes for SSEP recording? A- Less than 5000 Ohms B- At least 10 Megaohms C- Ohms D- 0.5 Ohms or less - Answer- A- Less than 5000 Ohms What does the phrenic nerve innervate? A- external intercostal B- The diaphragm C- Innermost intercostal D- Internal intercostal - Answer- B- The diaphragm If you have a pre-stimulus "negative" delay of 15 mS and a timebase of 45 mS, 15 mS will be displayed: A- Before the stimulus and 30 mS after B- After the stimulus and 30 mS after C- After the stimulus and 45 after D- Before the stimulus and 45 mS after - Answer- A- Before the stimulus and 30 mS after The generator of the P14 is thought to be A- Thalamocortical radiations B- A dorsal column volley C- The medial lemniscus in the brainstem D- The medial lemniscus in the cervical cord - Answer- C- The medial lemniscus in the brainstem If a lateral mass screw is placed at C2 which nerve root is at risk? A- C2 B- C3 C- C4 D- C1 - Answer- A- C2 The Spinal cord ends at: A- Sacrum B- T10 C- L3 D- L1 - Answer- D- L1 A lab calibrated their 30 dB intensity to be 0 dB HL. If they stimulated a patient at 90 dB from their machine, what would be the stimulus intensity? A- 90 HL B- 60 HL C- 60 SL D- 60 SL - Answer- B- 60 HL What is the most appropriate branch to monitor for a cervical surgery at C7? A- Musculocutaneous Nerve B- Radial Nerve C- Median Nerve D- Ulnar Nerve - Answer- B- Radial Nerve What is the purpose of pre-operative SSEP data? A- To bill for services B- To determine abnormalities C- To establish normative data D- To establish baselines for monitoring during surgery - Answer- B- To determine abnormalities How often does IOM equipment need to be checked for current leakage? A- Semiannually B- Biannually C- Every month D- Annually - Answer- A- Semiannually Which of the following instrumentation makes use of wires to secures rods to the spine? A- Luque B- Harrington rods C- Cotrel-Dubousset D- Isola - Answer- A- Luque What makes up the P300? A- LLAEP from temporal cortex B- FVEP from occipital cortex C- MLAEP from medial geniculate D- ABR from midbrain - Answer- A- LLAEP from temporal cortex In order to properly identify wave V of BAERs you might have to? A- Increase contralateral masking B- Bilateral ear stimulation C- Decrease contralateral masking D- Decrease intensity - Answer- D- Decrease intensity Where would you record P37? A- Cv5 B- EP C- Cpc D- Cpz - Answer- D- Cpz If check measures 1 cm in width and the distance from the visual stimulator to the subject is 1 meter, what is the visual angle of the check at the subject's eye A- 3.44 degrees B- 34.4 minutes C- 3.44 minutes D- 34.4 degrees - Answer- B- 34.4 minutes What is the presumed generator of wave III of the BAER? A- Lateral lemniscus B- Inferior colliculus C- Auditory nerve D- Superior Olivary complex - Answer- D- Superior Olivary complex What is the resulting waveform from a differential amplifier? Choose the correct answer. A- A downward signal into the second input will be displayed as an upward peak B- An upward signal into the first input will be displayed as a upward peak C- An upward signal into the second input will be displayed as an upward peak D- A downward signal into the first input will be displayed as a downward peak - Answer- C- An upward signal into the second input will be displayed as an upward peak NCV A- Latency/Distance B- Distance/Latency C- Distance/Stimulus Intensity D- Distance - Latency - Answer- B- Distance/Latency Intraoperative BAERs monitors function from the cochlea to? A- Medial lemniscus B- Lower midbrain C- Auditory cortex D- Lateral geniculate bodies - Answer- B- Lower midbrain A lesion causing homonymous hemianopsia would be most likely located A- At the optic chiasm B- In the retina C- Anterior to the chiasm D- Posterior to the chiasm - Answer- D- Posterior to the chiasm Fentanyl has what type of effect on responses? A- Decreased amplitudes B- Decreased latencies C- Increased amplitudes D- Increased latencies - Answer- D- Increased latencies If a lateral mass screw is placed at C7 which nerve root is at risk? A- C8 B- C6 C- C7 D- T1 - Answer- C- C7 What risks patient burns the most? A- Placing needles in patient's head B- Using surface electrodes for stimulation C- Using parallel wires D- Stress loops - Answer- A- Placing needles in patient's head N18: A- Far-field B- Cervical C- Cortical D- Near-field - Answer- A- Far-field Using an extension cord in the operating room increases? A- Amplifier input impedance B- The potential for a ground leak C- Amplitude of responses D- The amount of chassis leakage possible - Answer- D- The amount of chassis leakage possible What waveforms are recorded from the pre-central to post-central gyrus respectively? A- P25, N20 B- P22, N20 C- N23, P20 D- N20, P22 - Answer- B- P22, N20 What is the most important setting when establishing baseline BAER data? A- Turning on the notch filter B- Side of ear stimulation C- Optimal rep rate D- Click polarity - Answer- B- Side of ear stimulation What would you monitor for a microvascular decompression surgery to treat a patient with hemi-facial spasm? A- Facial and trigeminal EMG B- CN VII and VIII C- CN V, CN VII, and BAER D- BAER, CN VII EMG, and ephaptic potential - Answer- D- BAER, CN VII EMG, and ephaptic potential Intracranial stimulation of the facial nerve will yield an evoked CMAP occurring with a latency of: A- 3-5 mS B- 6-8 mS C- 8-10 mS D- 1-3 mS - Answer- B- 6-8 mS