CNIM EXAM QUESTIONS AND 100% VERIFIED
ANSWERS
What is the minimum allowed BAER sweep? - ANSWER 10 milliseconds
The ideal repetition rate for intraoperative BAEPs is... - ANSWER: 31Hz
The peak equivalent SPL of a click should be measured at... - Answer: 1000 Hz.
Which potential will be reversed with click polarity? - ANSWER: Cochlear
Microphonic
The most diagnostic aspect of the BAER is... - ANSWER I-V Interpeak
What is most likely to cause an increase in the I-III interval? - Answer:
Vestibular Schwannoma.
The intensity of sound stimulation at the tympanic membrane is determined by
the... - ANSWER: Acoustic connection between the sound stimulus generator
and the ear.
To best monitor CN VIII function in the OR, the ability to simultaneously
perform... - Answer BAEPs and Electrocochleograms (ECochG).
"Broadband click" refers to... - ANSWER Peak acoustic power is 2-4 kHz.
You are more likely to notice changes during the exposure of a spine surgery
because... - ANSWER: Anesthesia-induced hypotension
In posterior fossa surgery, an increase in the III-V interpeak interval is most
likely caused by... - ANSWER: Traction of the cerebellum
The loss of BAEPs after piercing the internal auditory canal is most likely
because... - ANSWER: disruption of the cochlear blood flow.
In a patient with a hematocrit less than 10%, the SSEP waveforms will... -
ANSWER: Increase in loudness and decrease in delay.
, Spinal cord ischemia following aortic surgery is best recognized by changes in...
- Answer PTN SSEPs.
A surgical patient's falling body temperature, monitored using EPs, can result
in... - ANSWER: Increasing SSEP and BAER latencies.
An unstable blood pressure during SSEP monitoring in the operating room
alters cortical EPs, resulting in... - ANSWER: fluctuating amplitudes.
When the blood flow to the brainstem is significantly diminished, a predicted
shift in the BAEP is... - ANSWER An increased latency of wave V.
Severe hypotension affects the EP in the following ways... - ANSWER: A drop
in amplitude and an increase in delay.
The greatest diversity of cortical EPs will most likely occur... - ANSWER:
During anesthetic changes.
Significant alterations in cervical and cortical SSEPs during IONM indicate
sufficient stimulation of the MN. - ANSWER: No change in peripheral
ANSWERs.
The majority of individuals who have significant EEG alterations following
carotid cross clamping will experience these changes within... - Answer in 20
seconds.
What notable EEG changes should you anticipate to detect with carotid
clamping-induced ischemia? - ANSWER Increased sluggish activity.
Brain activity straight from the cortex (ECoG) has very high amplitude and
typically requires sensitivity in the range of... - ANSWER: 40–100 uV/mm
It is critical to begin monitoring EEG early in a CEA... - ANSWER: Record the
EEG before anesthesia and after induction for comparison during the procedure.
Isolated amplifier inputs are designed to... - ANSWER: Prevent the
transmission of stray currents through the connecting cables to the patient.
ANSWERS
What is the minimum allowed BAER sweep? - ANSWER 10 milliseconds
The ideal repetition rate for intraoperative BAEPs is... - ANSWER: 31Hz
The peak equivalent SPL of a click should be measured at... - Answer: 1000 Hz.
Which potential will be reversed with click polarity? - ANSWER: Cochlear
Microphonic
The most diagnostic aspect of the BAER is... - ANSWER I-V Interpeak
What is most likely to cause an increase in the I-III interval? - Answer:
Vestibular Schwannoma.
The intensity of sound stimulation at the tympanic membrane is determined by
the... - ANSWER: Acoustic connection between the sound stimulus generator
and the ear.
To best monitor CN VIII function in the OR, the ability to simultaneously
perform... - Answer BAEPs and Electrocochleograms (ECochG).
"Broadband click" refers to... - ANSWER Peak acoustic power is 2-4 kHz.
You are more likely to notice changes during the exposure of a spine surgery
because... - ANSWER: Anesthesia-induced hypotension
In posterior fossa surgery, an increase in the III-V interpeak interval is most
likely caused by... - ANSWER: Traction of the cerebellum
The loss of BAEPs after piercing the internal auditory canal is most likely
because... - ANSWER: disruption of the cochlear blood flow.
In a patient with a hematocrit less than 10%, the SSEP waveforms will... -
ANSWER: Increase in loudness and decrease in delay.
, Spinal cord ischemia following aortic surgery is best recognized by changes in...
- Answer PTN SSEPs.
A surgical patient's falling body temperature, monitored using EPs, can result
in... - ANSWER: Increasing SSEP and BAER latencies.
An unstable blood pressure during SSEP monitoring in the operating room
alters cortical EPs, resulting in... - ANSWER: fluctuating amplitudes.
When the blood flow to the brainstem is significantly diminished, a predicted
shift in the BAEP is... - ANSWER An increased latency of wave V.
Severe hypotension affects the EP in the following ways... - ANSWER: A drop
in amplitude and an increase in delay.
The greatest diversity of cortical EPs will most likely occur... - ANSWER:
During anesthetic changes.
Significant alterations in cervical and cortical SSEPs during IONM indicate
sufficient stimulation of the MN. - ANSWER: No change in peripheral
ANSWERs.
The majority of individuals who have significant EEG alterations following
carotid cross clamping will experience these changes within... - Answer in 20
seconds.
What notable EEG changes should you anticipate to detect with carotid
clamping-induced ischemia? - ANSWER Increased sluggish activity.
Brain activity straight from the cortex (ECoG) has very high amplitude and
typically requires sensitivity in the range of... - ANSWER: 40–100 uV/mm
It is critical to begin monitoring EEG early in a CEA... - ANSWER: Record the
EEG before anesthesia and after induction for comparison during the procedure.
Isolated amplifier inputs are designed to... - ANSWER: Prevent the
transmission of stray currents through the connecting cables to the patient.
