CNIM FINAL EXAM AND PRACTICE EXAM LATEST
ACTUAL EXAM WITH 500 QUESTIONS AND
CORRECT, ACCURATE ANSWERS (100% VERIFIED
ANSWERS) PLUS RATIONALES NEWEST VERSION
2026 | 100% GUARANTEED PASS!!!
MULTIPLE CHOICES
1. During lumbar spine surgery with pedicle screw placement, the triggered EMG threshold drops from 18
mA to 6 mA. What is your most appropriate action?
A) Increase stimulation rate to 5 Hz
B) Notify surgeon of possible screw malposition
C) Decrease anesthesia depth
D) Switch to SEP monitoring only
Answer: B A threshold ≤10 mA suggests pedicle breach; 6 mA is critical and requires immediate surgical
correction.
2. A patient undergoing carotid endarterectomy shows a 55% amplitude drop in cortical SEPs after
clamping. No change in subcortical potentials. What is the most likely cause?
A) Global cerebral ischemia
B) Anesthetic overdose
C) Focal cortical ischemia
D) Electrode dislodgement
Answer: C Preserved subcortical N18 with loss of cortical N20 indicates selective cortical ischemia, common
with distal embolism or hypoperfusion.
3. For TcMEP monitoring during thoracic spine deformity correction, which anesthesia regimen is most
compatible?
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,A) Propofol infusion + low-dose narcotic
B) High-dose propofol + midazolam
C) Isoflurane >1 MAC + fentanyl
D) Sevoflurane + nitrous oxide
Answer: A Total intravenous anesthesia (TIVA) with propofol and low narcotic preserves MEP amplitude;
inhalational agents >0.5 MAC suppress MEPs severely.
4. A sudden loss of BAEP wave V during posterior fossa tumor resection occurs. Retractors were just
adjusted. Your immediate response?
A) Check impedance and re-average
B) Alert surgeon to possible cochlear nerve stretch
C) Increase click rate to 50 Hz
D) Turn off background EEG
Answer: B Sudden wave V loss after retractor movement suggests direct nerve traction; surgeon must be
notified immediately to prevent permanent deafness.
5. During scoliosis surgery, left tibial nerve cortical SEPs disappear but popliteal fossa potentials remain.
Right side normal. Most likely?
A) Systemic hypotension
B) Left lower extremity ischemia from positioning
C) Bilateral cortical stroke
D) Stimulator battery failure
Answer: B Unilateral loss of cortical SEP with preserved peripheral response points to a focal conductive
block, often from leg positioning or compression.
6. What is the minimum inter-electrode distance for transcranial electrical stimulation to avoid twitch
overlap?
A) 1 cm
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,B) 2 cm
C) 3 cm
D) 4 cm
Answer: C ≥3 cm prevents current shunting and reduces risk of tongue/lip twitch overlap, improving MEP
specificity.
7. A patient’s baseline SEPs show prolonged latencies bilaterally. Which preexisting condition is most likely?
A) Multiple sclerosis
B) Acute stroke
C) Carpal tunnel syndrome
D) Peripheral neuropathy
Answer: A Bilateral central conduction time prolongation without focal signs suggests demyelination, as in
MS.
8. During cervical spine surgery, free-running EMG shows sustained neurotonic discharges in the right
deltoid. Surgeon is at C4-5. What does this indicate?
A) C5 nerve root irritation
B) Normal background activity
C) Anesthetic emergence
D) Electrode artifact
Answer: A Sustained bursts in deltoid (C5 myotome) during cervical procedure indicates C5 nerve root
irritation.
9. Which filter settings are best for cortical SEP recording (N20)?
A) Low 5 Hz, high 500 Hz
B) Low 30 Hz, high 3000 Hz
C) Low 1 Hz, high 100 Hz
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, D) Low 10 Hz, high 1500 Hz
Answer: B 30–3000 Hz preserves the high-frequency components of early cortical SEPs while reducing low-
frequency drift and muscle artifact.
10. During a VP shunt procedure, EEG shows rhythmic frontal delta activity. What is the most likely cause?
A) Seizure
B) Anesthesia-related slowing
C) Intracranial hypotension from drainage
D) Electrode pop-off
Answer: C Frontal intermittent rhythmic delta (FIRDA) after CSF drainage suggests intracranial
hypotension or sagittal sinus traction.
11. When monitoring facial nerve EMG during acoustic neuroma resection, which muscle pair is most
sensitive?
A) Orbicularis oris and masseter
B) Orbicularis oculi and orbicularis oris
C) Frontalis and trapezius
D) Sternocleidomastoid and tongue
Answer: B Orbicularis oculi (temporal branch) and orbicularis oris (buccal/mandibular) cover upper and
lower facial divisions; both are standard.
12. A 30% amplitude drop in tibial nerve cortical SEP occurs with stable subcortical potentials. Anesthesia
unchanged. BP normal. Next step?
A) Increase stimulus intensity
B) Alert surgeon to possible spinal cord compromise
C) Check temperature
D) Re-reference electrodes
4|Page SUCCESS!!!
ACTUAL EXAM WITH 500 QUESTIONS AND
CORRECT, ACCURATE ANSWERS (100% VERIFIED
ANSWERS) PLUS RATIONALES NEWEST VERSION
2026 | 100% GUARANTEED PASS!!!
MULTIPLE CHOICES
1. During lumbar spine surgery with pedicle screw placement, the triggered EMG threshold drops from 18
mA to 6 mA. What is your most appropriate action?
A) Increase stimulation rate to 5 Hz
B) Notify surgeon of possible screw malposition
C) Decrease anesthesia depth
D) Switch to SEP monitoring only
Answer: B A threshold ≤10 mA suggests pedicle breach; 6 mA is critical and requires immediate surgical
correction.
2. A patient undergoing carotid endarterectomy shows a 55% amplitude drop in cortical SEPs after
clamping. No change in subcortical potentials. What is the most likely cause?
A) Global cerebral ischemia
B) Anesthetic overdose
C) Focal cortical ischemia
D) Electrode dislodgement
Answer: C Preserved subcortical N18 with loss of cortical N20 indicates selective cortical ischemia, common
with distal embolism or hypoperfusion.
3. For TcMEP monitoring during thoracic spine deformity correction, which anesthesia regimen is most
compatible?
1|Page SUCCESS!!!
,A) Propofol infusion + low-dose narcotic
B) High-dose propofol + midazolam
C) Isoflurane >1 MAC + fentanyl
D) Sevoflurane + nitrous oxide
Answer: A Total intravenous anesthesia (TIVA) with propofol and low narcotic preserves MEP amplitude;
inhalational agents >0.5 MAC suppress MEPs severely.
4. A sudden loss of BAEP wave V during posterior fossa tumor resection occurs. Retractors were just
adjusted. Your immediate response?
A) Check impedance and re-average
B) Alert surgeon to possible cochlear nerve stretch
C) Increase click rate to 50 Hz
D) Turn off background EEG
Answer: B Sudden wave V loss after retractor movement suggests direct nerve traction; surgeon must be
notified immediately to prevent permanent deafness.
5. During scoliosis surgery, left tibial nerve cortical SEPs disappear but popliteal fossa potentials remain.
Right side normal. Most likely?
A) Systemic hypotension
B) Left lower extremity ischemia from positioning
C) Bilateral cortical stroke
D) Stimulator battery failure
Answer: B Unilateral loss of cortical SEP with preserved peripheral response points to a focal conductive
block, often from leg positioning or compression.
6. What is the minimum inter-electrode distance for transcranial electrical stimulation to avoid twitch
overlap?
A) 1 cm
2|Page SUCCESS!!!
,B) 2 cm
C) 3 cm
D) 4 cm
Answer: C ≥3 cm prevents current shunting and reduces risk of tongue/lip twitch overlap, improving MEP
specificity.
7. A patient’s baseline SEPs show prolonged latencies bilaterally. Which preexisting condition is most likely?
A) Multiple sclerosis
B) Acute stroke
C) Carpal tunnel syndrome
D) Peripheral neuropathy
Answer: A Bilateral central conduction time prolongation without focal signs suggests demyelination, as in
MS.
8. During cervical spine surgery, free-running EMG shows sustained neurotonic discharges in the right
deltoid. Surgeon is at C4-5. What does this indicate?
A) C5 nerve root irritation
B) Normal background activity
C) Anesthetic emergence
D) Electrode artifact
Answer: A Sustained bursts in deltoid (C5 myotome) during cervical procedure indicates C5 nerve root
irritation.
9. Which filter settings are best for cortical SEP recording (N20)?
A) Low 5 Hz, high 500 Hz
B) Low 30 Hz, high 3000 Hz
C) Low 1 Hz, high 100 Hz
3|Page SUCCESS!!!
, D) Low 10 Hz, high 1500 Hz
Answer: B 30–3000 Hz preserves the high-frequency components of early cortical SEPs while reducing low-
frequency drift and muscle artifact.
10. During a VP shunt procedure, EEG shows rhythmic frontal delta activity. What is the most likely cause?
A) Seizure
B) Anesthesia-related slowing
C) Intracranial hypotension from drainage
D) Electrode pop-off
Answer: C Frontal intermittent rhythmic delta (FIRDA) after CSF drainage suggests intracranial
hypotension or sagittal sinus traction.
11. When monitoring facial nerve EMG during acoustic neuroma resection, which muscle pair is most
sensitive?
A) Orbicularis oris and masseter
B) Orbicularis oculi and orbicularis oris
C) Frontalis and trapezius
D) Sternocleidomastoid and tongue
Answer: B Orbicularis oculi (temporal branch) and orbicularis oris (buccal/mandibular) cover upper and
lower facial divisions; both are standard.
12. A 30% amplitude drop in tibial nerve cortical SEP occurs with stable subcortical potentials. Anesthesia
unchanged. BP normal. Next step?
A) Increase stimulus intensity
B) Alert surgeon to possible spinal cord compromise
C) Check temperature
D) Re-reference electrodes
4|Page SUCCESS!!!
