CNIM Intraoperative Exam questions with
correct expert verified detailed answers
latest updated version 2025 100% Pass
For preoperative posterior tibial SSEPs, which of the following would
be the best ipsilateral location for the ground electrode? --- correct
precise answer ---Calf
If nasion to inion measures 40 cm, the distance between Fpz and Cz is
what? --- correct precise answer ---16 cm
To avoid a false positive, the baseline is best taken --- correct precise
answer ---pre-incision.
During a discussion with the anesthesiologist prior to starting IONM
on a spinal correction surgery, you are informed the MDA plans to use
volatile anesthetics. Rank the volatile anesthetic agents per their MAC
values (highest to lowest). --- correct precise answer ---Desflurane >
Sevoflurane > Isoflurane
,According to ACNS guidelines, baseline data should be established: ---
correct precise answer ---Following positioning, but prior to surgical
manipulation of nervous system
Nitrous Oxide --- correct precise answer ---Decreases waveform
amplitude and increases the latency of cortical responses
The highest percentage of EEG changes seen after cross clamping
during CEA happen within ______ of the cross clamp being placed. ---
correct precise answer ---two minutes
Which of the following can increase SSEP amplitudes? --- correct
precise answer ---Etomidate
During the monitoring of a selective dorsal rhizotomy, what muscle is
critical to monitor? --- correct precise answer ---Anal Sphincter
If there is a 60 Hz interference in all channels when recording
preoperative median nerve SSEPs, which of the following electrodes
should be adjusted first? --- correct precise answer ---Ground
electrode
,Median nerve peripheral conduction between the brachial plexus and
cervical cord is the time measured from: --- correct precise answer ---
EP-N13
Which structure is at risk during an XLIF procedure? --- correct
precise answer ---Lumbar plexus
In recording electrocochleograms, it is best to stimulate using ---
correct precise answer ---rarefaction or condensation clicks.
Which of the following is most likely to cause electrical interference
for evoked potential waveforms in the operating room? --- correct
precise answer ---Electrocautery
Which of the following would most likely be normal in the lower
extremity SSEP of a patient with a dorsal column lesion? --- correct
precise answer ---Popliteal Fossa Response
1 MAC of Desflurane is equivalent to a concentration of: --- correct
precise answer ---0.06
, During a median nerve preoperative study, a patient has discomfort at
the wrist. Stimulating electrodes are 10mm gold disk, stimulus
intensity is 20 mA, and stimulus duration is 100 microseconds. Which
of the following would most likely reduce the patients discomfort
while maintaining adequate stimulation? --- correct precise answer --
-Decrease the stimulus intensity to motor threshold
To4 is used to determine which of the following values? --- correct
precise answer ---level of neuromuscular blockage present
Which of the following is a common complication of microvascular
decompression of cranial nerve VIII? --- correct precise answer ---
Hearing loss
Ischemic injury of the anterior spinal artery will affect which
modality first? --- correct precise answer ---tcMEPs
Extreme cerebellar retraction during CPA tumor surgery likely results
in: --- correct precise answer ---Loss of all waves due to vascular
compromise
Wave I of the Brainstem Auditory Evoked Potential (BAEP) has a
typical post-stimulus latency of --- correct precise answer ---2 ms
correct expert verified detailed answers
latest updated version 2025 100% Pass
For preoperative posterior tibial SSEPs, which of the following would
be the best ipsilateral location for the ground electrode? --- correct
precise answer ---Calf
If nasion to inion measures 40 cm, the distance between Fpz and Cz is
what? --- correct precise answer ---16 cm
To avoid a false positive, the baseline is best taken --- correct precise
answer ---pre-incision.
During a discussion with the anesthesiologist prior to starting IONM
on a spinal correction surgery, you are informed the MDA plans to use
volatile anesthetics. Rank the volatile anesthetic agents per their MAC
values (highest to lowest). --- correct precise answer ---Desflurane >
Sevoflurane > Isoflurane
,According to ACNS guidelines, baseline data should be established: ---
correct precise answer ---Following positioning, but prior to surgical
manipulation of nervous system
Nitrous Oxide --- correct precise answer ---Decreases waveform
amplitude and increases the latency of cortical responses
The highest percentage of EEG changes seen after cross clamping
during CEA happen within ______ of the cross clamp being placed. ---
correct precise answer ---two minutes
Which of the following can increase SSEP amplitudes? --- correct
precise answer ---Etomidate
During the monitoring of a selective dorsal rhizotomy, what muscle is
critical to monitor? --- correct precise answer ---Anal Sphincter
If there is a 60 Hz interference in all channels when recording
preoperative median nerve SSEPs, which of the following electrodes
should be adjusted first? --- correct precise answer ---Ground
electrode
,Median nerve peripheral conduction between the brachial plexus and
cervical cord is the time measured from: --- correct precise answer ---
EP-N13
Which structure is at risk during an XLIF procedure? --- correct
precise answer ---Lumbar plexus
In recording electrocochleograms, it is best to stimulate using ---
correct precise answer ---rarefaction or condensation clicks.
Which of the following is most likely to cause electrical interference
for evoked potential waveforms in the operating room? --- correct
precise answer ---Electrocautery
Which of the following would most likely be normal in the lower
extremity SSEP of a patient with a dorsal column lesion? --- correct
precise answer ---Popliteal Fossa Response
1 MAC of Desflurane is equivalent to a concentration of: --- correct
precise answer ---0.06
, During a median nerve preoperative study, a patient has discomfort at
the wrist. Stimulating electrodes are 10mm gold disk, stimulus
intensity is 20 mA, and stimulus duration is 100 microseconds. Which
of the following would most likely reduce the patients discomfort
while maintaining adequate stimulation? --- correct precise answer --
-Decrease the stimulus intensity to motor threshold
To4 is used to determine which of the following values? --- correct
precise answer ---level of neuromuscular blockage present
Which of the following is a common complication of microvascular
decompression of cranial nerve VIII? --- correct precise answer ---
Hearing loss
Ischemic injury of the anterior spinal artery will affect which
modality first? --- correct precise answer ---tcMEPs
Extreme cerebellar retraction during CPA tumor surgery likely results
in: --- correct precise answer ---Loss of all waves due to vascular
compromise
Wave I of the Brainstem Auditory Evoked Potential (BAEP) has a
typical post-stimulus latency of --- correct precise answer ---2 ms
