Which is characteristic of AC polarity?
A- Abnormal I‐V intervals
B- No effect on wave I amplitude
C- Reduces stimulation artifact
D- Recommended for premature babies - Answer- C- Reduces stimulation artifact
According to the ACNS guidelines, system bandpass settings for monitoring facial nerve
spontaneous muscle activity should be
A- 1‐250 to 1500 Hz
B- 100‐200 to 1000‐3000 Hz
C- 10‐30 to 16,000 Hz
D- 10‐30 to 2500‐3000 Hz - Answer- C- 10‐30 to 16,000 Hz
Assume your impedances for two recording electrodes are 5.1 kΩ and 2.1 kΩ. What
should you do to reduce background noise and improve responses?
A- Reapply the ground
B- Equalize electrode impedances
C- Lower the stimulation rate
D- Move the electrodes closer together - Answer- B- Equalize electrode impedances
If you get artifact in your subcortical channel you:
A- Ask the surgeon to move retractors
B- Disable the subcortical channel
C- Ask anesthesia to increase gases
D- Use a spare CS5 electrode - Answer- D- Use a spare CS5 electrode
What is the time between P14 and N20 for MN SSEPs?
A- Analysis period
B- Central conduction time
C- Thalamocortical time
D- Peripheral conduction time - Answer- B- Central conduction time
,Which is the minimum required CMRR?
A- 10,000:1
B- 100:1
C- 5000:1
D- 1000:1 - Answer- A- 10,000:1
Which is the most common cause of death from electric shock?
A- Destruction of critical nerve paths
B- Paralysis of breathing reflex
C- Ventricular fibrillation
D- 3rd degree skin burns - Answer- C- Ventricular fibrillation
One contraindication for the use of transcranial electrical motor evoked potentials is
A- Epilepsy
B- Cervical myelopathy
C- Scoliosis
D- Trigeminal neuralgia - Answer- A- Epilepsy
A pneumatic drill would introduce what kind of artifact?
A- 500 Hz
B- 1 Hz
C- 3000 Hz
D- 60 Hz - Answer- A- 500 Hz
What is the suggested intraoperative auditory stimulation accordig to ACNS guidelines?
A- 90 dB SL without masking
B- 100 dB pe SPL with masking
C- 90 dB HL with masking
D- 100 dB pe SPL without masking - Answer- B- 100 dB pe SPL with masking
Which is the most common type of change observed during CEA?
A- Ipsilateral EEG slowing, reduced cortical SSEP to contralateral stimulation
B- Bilateral EEG slowing, reduced cortical SSEP to bilateral stimulation
C- Ipsilateral EEG slowing, reduced cortical SSEP to ipsilateral stimulation
D- Contalateral EEG slowing, reduced cortical SSEP to contralateral stimulation -
Answer- A- Ipsilateral EEG slowing, reduced cortical SSEP to contralateral stimulation
Which of the following would most likely be normal in the pre-operative baseline upper
extremity SSEP of a patient with a lesion in the dorsal column?
A- Erbs point potential
B- N20
C- Central conduction time
D- P22 - Answer- A- Erbs point potential
Lumbar potential is generated from:
A- Pre-synaptic responses
When placing PF you want the active electrode:
A- Lateral to the PF
B- Medial to the PF
C- Above the PF crease
D- Below the PF crease - Answer- C- Above the PF crease
Which of the following nerve injuries usually does NOT produce spontaneous EMG
activity during intraoperative monitoring?
A- Ischemia
B- Irrigation
C- Pressure
D- Heat - Answer- A- Ischemia
Which of the following is considered HIPPA protected patient information?
A- Sexual orientation
B- Patient name
C- Height
D- Weight - Answer- B- Patient name
Which of the following diseases results from infection by a bloodborne pathogen?
A- Hepatitis B
B- Varicella
C- Herpes zoster
D- Mononucleosis - Answer- A- Hepatitis B
Which is required to prevent aliasing of a signal?
A- Use a stimulus frequency below the Nyquist
B- Sampling below the Nyquist frequency
C- Setting the timebase to at least 100 mS
D- Sampling at least the Nyquist frequency - Answer- D- Sampling at least the Nyquist
frequency
An objective measure of meaningful change to use to warn the surgeon is the
A- IPL decrease
B- 10% amplitude decrease
C- Latency decrease
D- 50% amplitude decrease - Answer- D- 50% amplitude decrease
During WADA language testing, what should you expect after injection of sodium
amytal?
A- Bilateral cortex slow wave activity increase
B- Contralateral cortex slow wave activity increase
Which of the following is a common complication of microvascular decompression of
cranial nerve VII?
A- Lower extremity weakness
B- Visual loss
C- Hearing loss
D- Upper extremity weakness - Answer- C- Hearing loss
The use of intraoperative monitoring during scoliosis surgery may replace the
A- Hoffman sign
B- Romberg test
C- Babinski sign
D- Stagnara test - Answer- D- Stagnara test
4-137 If you need 100 trials to get a SNR of 2:1, how many trials are needed for a SNR
of 20:1?
A- 10,000
B- 1000
C- 20,000
D- 2000 - Answer- A- 10,000
A dorsal rhizotomy involves:
A- Cutting motor roots
B- Resection of the filum terminale
C- Removing a tumor
D- Cutting sensory roots - Answer- D- Cutting sensory roots
Phase reversal of SSEPs following intraoperative median nerve stimulation is used for
localizing:
A- Occipital cortex
B- Thalamic sensory pathway
C- Language area
D- Sensorimotor cortex - Answer- D- Sensorimotor cortex
While performing a posterior tibial SSEP, hypothermia of the lower extremities is most
likely to cause
A- Increased T12‐P37 latency
B- Increased L3‐P37 latency
C- Abnormal prolongation of the P37‐N45 complex
D- Slowed peripheral conduction velocity - Answer- D- Slowed peripheral conduction
velocity
What if the interstimulus interval of a 50 Hz click stimulus?
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