1. What type of stimulation is used in transcranial motor evoked
potentials?
A. Electrical
B. Magnetic
C. Thermal
D. Mechanical
Answer: A
Rationale: Electrical stimulation is commonly used in transcranial
MEPs to activate motor pathways.
2. Which factor does not typically affect evoked potentials?
A. Patient's age
B. Muscle relaxants
C. Body temperature
D. Anesthesia depth
Answer: B
Rationale: Muscle relaxants do not significantly affect evoked
potentials, unlike other factors listed.
3. Which factor is least likely to affect SSEPs?
,A. Hypothermia
B. Muscle relaxants
C. Hypotension
D. Anesthetic depth
Answer: B
Rationale: Muscle relaxants do not directly affect SSEP signals because
they primarily act on neuromuscular junctions, not sensory pathways.
4. What is the primary purpose of triggered EMG during pedicle screw
placement?
A. Monitor sensory pathways
B. Evaluate screw proximity to neural structures
C. Detect cortical function
D. Assess motor pathways
Answer: B
Rationale: Triggered EMG assesses the proximity of pedicle screws to
neural elements by stimulating the screw and recording responses.
5. Which modality is best for monitoring spinal nerve roots during
lumbosacral surgeries?
A. MEPs
B. Free-running EMG
C. SSEPs
, D. BAEPs
Answer: B
Rationale: Free-running EMG is ideal for detecting irritation or injury
to spinal nerve roots during such surgeries.
6. What is the role of a baseline recording in IONM?
A. To identify technical issues
B. To establish normal patient responses
C. To predict postoperative outcomes
D. To monitor anesthesia depth
Answer: B
Rationale: Baseline recordings establish the patient’s normal responses
for comparison during surgery.
7. Which factor can reduce the effectiveness of BAEPs?
A. Muscle relaxants
B. Background noise
C. Volatile anesthetics
D. Patient positioning
Answer: B
Rationale: Background noise, especially in the operating room, can
interfere with the auditory signals used in BAEPs.
potentials?
A. Electrical
B. Magnetic
C. Thermal
D. Mechanical
Answer: A
Rationale: Electrical stimulation is commonly used in transcranial
MEPs to activate motor pathways.
2. Which factor does not typically affect evoked potentials?
A. Patient's age
B. Muscle relaxants
C. Body temperature
D. Anesthesia depth
Answer: B
Rationale: Muscle relaxants do not significantly affect evoked
potentials, unlike other factors listed.
3. Which factor is least likely to affect SSEPs?
,A. Hypothermia
B. Muscle relaxants
C. Hypotension
D. Anesthetic depth
Answer: B
Rationale: Muscle relaxants do not directly affect SSEP signals because
they primarily act on neuromuscular junctions, not sensory pathways.
4. What is the primary purpose of triggered EMG during pedicle screw
placement?
A. Monitor sensory pathways
B. Evaluate screw proximity to neural structures
C. Detect cortical function
D. Assess motor pathways
Answer: B
Rationale: Triggered EMG assesses the proximity of pedicle screws to
neural elements by stimulating the screw and recording responses.
5. Which modality is best for monitoring spinal nerve roots during
lumbosacral surgeries?
A. MEPs
B. Free-running EMG
C. SSEPs
, D. BAEPs
Answer: B
Rationale: Free-running EMG is ideal for detecting irritation or injury
to spinal nerve roots during such surgeries.
6. What is the role of a baseline recording in IONM?
A. To identify technical issues
B. To establish normal patient responses
C. To predict postoperative outcomes
D. To monitor anesthesia depth
Answer: B
Rationale: Baseline recordings establish the patient’s normal responses
for comparison during surgery.
7. Which factor can reduce the effectiveness of BAEPs?
A. Muscle relaxants
B. Background noise
C. Volatile anesthetics
D. Patient positioning
Answer: B
Rationale: Background noise, especially in the operating room, can
interfere with the auditory signals used in BAEPs.
