1. Which of the following is the most common cause of false-
positive or false-negative results during motor evoked potential
(MEP) monitoring?
A. Patient movement
B. Inadequate electrode placement
C. Incorrect anesthetic dosage
D. Equipment malfunction
Answer: B) Inadequate electrode placement
Rationale: Incorrect electrode placement can lead to inaccurate
MEP recordings, either giving false positives or failing to detect
true motor pathway injury.
2. Which of the following electrodes is typically used for cortical
motor monitoring during surgery?
A. Scalp electrodes
B. Needle electrodes placed in the muscle
C. Subdural electrodes
D. Spinal cord electrodes
Answer: C) Subdural electrodes
,Rationale: Subdural electrodes are used for direct cortical
monitoring, especially during neurosurgical procedures to assess
motor function.
3. When monitoring the somatosensory evoked potentials (SSEP)
in a lower limb, which of the following nerves is commonly
stimulated?
A. Tibial nerve
B. Median nerve
C. Femoral nerve
D. Ulnar nerve
Answer: A) Tibial nerve
Rationale: The tibial nerve is commonly stimulated in lower limb
surgeries to monitor SSEP responses from the sensory pathways.
4. What is the primary risk when using motor evoked potentials
(MEPs) for intraoperative monitoring in the setting of a
decompressive laminectomy?
A. Neurological deficits from ischemia
B. Seizure induction from electrical stimulation
C. Increased muscle relaxation from anesthesia
D. Sudden drop in blood pressure
Answer: B) Seizure induction from electrical stimulation
, Rationale: MEPs involve transcranial electrical stimulation, which
may cause seizures in patients predisposed to seizure activity,
such as those with epilepsy or brain abnormalities.
5. Which of the following is the most common site of stimulation
for somatosensory evoked potentials (SSEP) in upper limb
monitoring?
A. Median nerve
B. Tibial nerve
C. Ulnar nerve
D. Radial nerve
Answer: A) Median nerve
Rationale: The median nerve is most commonly stimulated to
monitor SSEPs in upper limb surgeries due to its accessibility and
relevance for sensory pathway monitoring.
6. The use of electromyography (EMG) during surgery allows for
monitoring of which of the following?
A. Sensory pathways
B. Motor pathways and muscle function
C. Brain electrical activity
D. Auditory pathways
Answer: B) Motor pathways and muscle function
positive or false-negative results during motor evoked potential
(MEP) monitoring?
A. Patient movement
B. Inadequate electrode placement
C. Incorrect anesthetic dosage
D. Equipment malfunction
Answer: B) Inadequate electrode placement
Rationale: Incorrect electrode placement can lead to inaccurate
MEP recordings, either giving false positives or failing to detect
true motor pathway injury.
2. Which of the following electrodes is typically used for cortical
motor monitoring during surgery?
A. Scalp electrodes
B. Needle electrodes placed in the muscle
C. Subdural electrodes
D. Spinal cord electrodes
Answer: C) Subdural electrodes
,Rationale: Subdural electrodes are used for direct cortical
monitoring, especially during neurosurgical procedures to assess
motor function.
3. When monitoring the somatosensory evoked potentials (SSEP)
in a lower limb, which of the following nerves is commonly
stimulated?
A. Tibial nerve
B. Median nerve
C. Femoral nerve
D. Ulnar nerve
Answer: A) Tibial nerve
Rationale: The tibial nerve is commonly stimulated in lower limb
surgeries to monitor SSEP responses from the sensory pathways.
4. What is the primary risk when using motor evoked potentials
(MEPs) for intraoperative monitoring in the setting of a
decompressive laminectomy?
A. Neurological deficits from ischemia
B. Seizure induction from electrical stimulation
C. Increased muscle relaxation from anesthesia
D. Sudden drop in blood pressure
Answer: B) Seizure induction from electrical stimulation
, Rationale: MEPs involve transcranial electrical stimulation, which
may cause seizures in patients predisposed to seizure activity,
such as those with epilepsy or brain abnormalities.
5. Which of the following is the most common site of stimulation
for somatosensory evoked potentials (SSEP) in upper limb
monitoring?
A. Median nerve
B. Tibial nerve
C. Ulnar nerve
D. Radial nerve
Answer: A) Median nerve
Rationale: The median nerve is most commonly stimulated to
monitor SSEPs in upper limb surgeries due to its accessibility and
relevance for sensory pathway monitoring.
6. The use of electromyography (EMG) during surgery allows for
monitoring of which of the following?
A. Sensory pathways
B. Motor pathways and muscle function
C. Brain electrical activity
D. Auditory pathways
Answer: B) Motor pathways and muscle function
