1. Why is transcranial electrical stimulation used in MEPs instead of
magnetic stimulation?
A. Magnetic stimulation is less effective intraoperatively
B. Electrical stimulation provides more robust responses
C. Magnetic stimulation is contraindicated in surgery
D. Electrical stimulation reduces artifacts
Answer: B
Rationale: Electrical stimulation generates stronger and more reliable
MEP responses during surgery.
2. Which waveform component reflects subcortical activity in SSEPs?
A. N20
B. P37
C. N13
D. P100
Answer: C
Rationale: N13 reflects subcortical activity in SSEPs.
3. During acoustic neuroma surgery, which modality is most useful for
monitoring hearing preservation?
,A. SSEPs
B. BAEPs
C. MEPs
D. EEG
Answer: B
Rationale: BAEPs are critical for assessing auditory nerve function and
preserving hearing during acoustic neuroma surgery.
4. What does free-running EMG activity typically indicate?
A. Voluntary muscle movement
B. Peripheral nerve irritation
C. Motor cortex stimulation
D. Sensory pathway activation
Answer: B
Rationale: Free-running EMG activity can indicate irritation or
impending injury to a monitored nerve.
5. What does a sudden loss of MEPs during surgery most likely
indicate?
A. Brain ischemia
B. Damage to motor pathways
C. Peripheral nerve injury
, D. Anesthetic effects
Answer: B
Rationale: Loss of MEPs often suggests a disruption in motor
pathways, which may result from ischemia, nerve injury, or spinal cord
compromise.
6. Which modality is primarily used to monitor motor pathways during
IONM?
A. Somatosensory Evoked Potentials (SSEPs)
B. Motor Evoked Potentials (MEPs)
C. Electroencephalography (EEG)
D. Brainstem Auditory Evoked Potentials (BAEPs)
Answer: B
Rationale: MEPs are specifically used to assess motor pathways by
stimulating the motor cortex and recording responses from muscles.
7. What type of stimulation is used in transcranial motor evoked
potentials?
A. Electrical
B. Magnetic
C. Thermal
D. Mechanical
Answer: A
magnetic stimulation?
A. Magnetic stimulation is less effective intraoperatively
B. Electrical stimulation provides more robust responses
C. Magnetic stimulation is contraindicated in surgery
D. Electrical stimulation reduces artifacts
Answer: B
Rationale: Electrical stimulation generates stronger and more reliable
MEP responses during surgery.
2. Which waveform component reflects subcortical activity in SSEPs?
A. N20
B. P37
C. N13
D. P100
Answer: C
Rationale: N13 reflects subcortical activity in SSEPs.
3. During acoustic neuroma surgery, which modality is most useful for
monitoring hearing preservation?
,A. SSEPs
B. BAEPs
C. MEPs
D. EEG
Answer: B
Rationale: BAEPs are critical for assessing auditory nerve function and
preserving hearing during acoustic neuroma surgery.
4. What does free-running EMG activity typically indicate?
A. Voluntary muscle movement
B. Peripheral nerve irritation
C. Motor cortex stimulation
D. Sensory pathway activation
Answer: B
Rationale: Free-running EMG activity can indicate irritation or
impending injury to a monitored nerve.
5. What does a sudden loss of MEPs during surgery most likely
indicate?
A. Brain ischemia
B. Damage to motor pathways
C. Peripheral nerve injury
, D. Anesthetic effects
Answer: B
Rationale: Loss of MEPs often suggests a disruption in motor
pathways, which may result from ischemia, nerve injury, or spinal cord
compromise.
6. Which modality is primarily used to monitor motor pathways during
IONM?
A. Somatosensory Evoked Potentials (SSEPs)
B. Motor Evoked Potentials (MEPs)
C. Electroencephalography (EEG)
D. Brainstem Auditory Evoked Potentials (BAEPs)
Answer: B
Rationale: MEPs are specifically used to assess motor pathways by
stimulating the motor cortex and recording responses from muscles.
7. What type of stimulation is used in transcranial motor evoked
potentials?
A. Electrical
B. Magnetic
C. Thermal
D. Mechanical
Answer: A
