Ionm Final4

1. Which modality is best for monitoring corticospinal tract function?
A. SSEPs
B. BAEPs
C. MEPs
D. EMG
Answer: C
Rationale: MEPs directly assess corticospinal tract integrity.


2. During brain surgery, which modality helps monitor cortical
ischemia?
A. MEPs
B. EEG
C. BAEPs
D. EMG
Answer: B
Rationale: EEG is sensitive to changes in cortical activity and is used to
detect ischemia.


3. Which modality is commonly used to monitor the spinal cord during
scoliosis surgery?

,A. EEG
B. MEPs and SSEPs
C. BAEPs
D. Free-running EMG
Answer: B
Rationale: Both MEPs and SSEPs are used to monitor motor and
sensory pathways to ensure spinal cord integrity during scoliosis
correction.


4. What is the significance of the alarm criteria in IONM?
A. To detect technical artifacts
B. To notify surgeons of potential neurologic injury
C. To adjust anesthesia levels
D. To record patient movements
Answer: B
Rationale: Alarm criteria guide the team in recognizing significant
changes in monitoring signals that could indicate neurological
compromise.


5. Why is continuous EEG used during carotid endarterectomy?
A. To monitor sensory pathways
B. To detect cortical ischemia
C. To record motor activity

, D. To evaluate cranial nerve function
Answer: B
Rationale: Continuous EEG is used to monitor cerebral ischemia
during carotid endarterectomy.


6. Which response indicates nerve irritation during free-running
EMG?
A. Loss of signal
B. Bursts of activity
C. Increased amplitude of SSEPs
D. Reduced signal latency
Answer: B
Rationale: Bursts of EMG activity suggest nerve irritation or potential
injury.


7. Which cranial nerve is monitored using EMG during vestibular
schwannoma surgery?
A. Cranial nerve III
B. Cranial nerve VII
C. Cranial nerve IX
D. Cranial nerve XII
Answer: B