CNIM 2026 LATEST 2026 EXAM QUESTIONS AND
ANSWERS GRADED A+
✔✔The pneumatic drill has which of the following effects on BAEP'S?
1. None
2. Prolongs Wave V
3. Increases I-III interpeak latency
4. Increase III-V interpeak latency - ✔✔2. Prolongs Wave V
✔✔In posterior fossa craniotomy surgery for a large tumor with unilateral hearing loss,
the appropriate modalities to monitor would be:
a) Contralateral BAEP, median nerve and facial nerve
b) Ipsilateral BAEP and facial nerve
c) Facial nerve and contralateral median nerve
d) Ipsilateral BAEP - ✔✔a) Contralateral BAEP, median nerve and facial nerve
✔✔During middle or posterior fossa surgery, what structure is most at risk?
a) Cerebellum
b) Brainstem
c) Optic Nerve
d) Spinal Cord - ✔✔b) Brainstem
✔✔In posterior fossa surgery, an increase in the III-V interpeak interval would most
likely be due to:
a) Traction on the cerebellum
b) Compression of the upper midbrain
c) Traction on the acoustic nerve
d) Fluid in the middle ear - ✔✔a) traction on the cerebellum
✔✔What muscle would you monitor for EMG activity for cranial nerve XII?
a) Tongue
b) Trapezius
c) Masseter
d) Frontalis - ✔✔a) tongue
✔✔If CN VII were transected, you would get:
a) Absence of all waves I-V
b) Increased I-III latency
c) Loss of wave V only
,d) No changes - ✔✔d) No changes
✔✔Loss of BAEP's during drilling of the internal auditory canal is most likely due to:
a) Disruption of the blood supply
b) Compression of the brainstem
c) Transection of the auditory nerve
d) Artifact from the drill - ✔✔d) Artifact from the drill
✔✔What would be the effect of fluid in the internal auditory canal?
a) Increase of the absolute latencies
b) Increased wave amplitudes
c) Increased I-V latency
d) Loss of all waves - ✔✔a) increase of the absolute latencies
✔✔The prominent wave for monitoring BAEP's is:
a) Wave I
b) Wave III
c) Wave V
d) ECoG - ✔✔c) Wave V
✔✔Which of these can enhance the wave I amplitude?
a) Use condensation instead of rarefaction
b) Increase click intensity
c) Decrease sweep speed
d) Increase rep rate - ✔✔b) Increase click intensity
✔✔What is the MINIMUM acceptable sweep for BAEPs?
a) 5 msec
b) 15 msec
c) 25 msec
d) 35 msec - ✔✔b) 15 msec
✔✔If wave I is present in the contralateral ear montage, this could be caused by:
a) The wrong click polarity
b) Insufficient contralateral masking
c) Too rapid rep rate
d) Stimulating the wrong ear - ✔✔b) insufficient contralateral masking
,✔✔The intraoperative BAEP is most likely to be obscured by:
a) Patient position
b) Eye movement
c) Muscle artifact
d) Warming blanket - ✔✔c) muscle artifact
✔✔An optimal rep rate for BAEP's is:
a) 4 Hz
b) 31 Hz
c) 66 Hz
d) 72 Hz - ✔✔b) 31 Hz
✔✔Contralateral ear masking should be at:
a) 160 dB SPL
b) 60 dB HL
c) 60 dB SL
d) 75 dB SPL - ✔✔c) 60 dB SL
✔✔The peak equivalent SPL of a click should be:
a) 500 Hz
b) 3000 Hz
c) 5000 Hz
d) 10,000 Hz - ✔✔b) 3000 Hz
✔✔Which of the following potentials will change with click polarity?
a) Wave I latency
b) I-V interpeak
c) Wave V latency
d) Wave V amplitude - ✔✔d) Wave V amplitude
✔✔The proper filter settings for recording BAEP's are:
a) 1-25 to 2500-3000 Hz
b) 1-250 Hz
c) 500-5000 Hz
d) 1-1000 Hz - ✔✔a) 1-25 to 2500-3000 Hz
✔✔If unavoidable muscle artifact is present in the BAEP, you can change the filters to:
, a) 500-1000 Hz
b) 100-200 to 1500 Hz
c) 10-500 Hz
d) 1-1000 Hz - ✔✔b) 100-200 to 1500 Hz
✔✔Hearing level (HL) is defined by:
a) An individual's hearing threshold
b) The average hearing threshold of a normal population
c) The absolute sound pressure relative to atmospheric pressure
d) A table of clinical values - ✔✔b) The average hearing threshold of a normal
population
✔✔Sensation level (SL) is defined by:
a) An individual's hearing threshold
b) The average hearing threshold of a normal population
c) The absolute sound pressure relative to atmospheric pressure
d) A table of clinical values - ✔✔a) An individual's hearing threshold
✔✔In the presence of irreducible artifact, the filters may be set at 100-200 - 1000 Hz for
recording intraoperative:
a) SSEPS
b) EMG
c) MEPs
d) BAEPs - ✔✔d) BAEPs
✔✔Wave V of the BAEP is most affected by:
a) Anesthesia below 1 MAC
b) Retraction
c) Muscle relaxants
d) Temperature changes - ✔✔b) retraction
✔✔If the latency of Wave III of the BAEP is 4.5 using tube inserts it will be:
a) 5.4 using headphones
b) The same using headphones
c) 3.6 using headphones
d) 5.4 using small inserts - ✔✔c) 3.6 using headphones
✔✔The filter settings for recording BAEPs intraoperatively should be:
a) 100-300 to 10,000 Hz
ANSWERS GRADED A+
✔✔The pneumatic drill has which of the following effects on BAEP'S?
1. None
2. Prolongs Wave V
3. Increases I-III interpeak latency
4. Increase III-V interpeak latency - ✔✔2. Prolongs Wave V
✔✔In posterior fossa craniotomy surgery for a large tumor with unilateral hearing loss,
the appropriate modalities to monitor would be:
a) Contralateral BAEP, median nerve and facial nerve
b) Ipsilateral BAEP and facial nerve
c) Facial nerve and contralateral median nerve
d) Ipsilateral BAEP - ✔✔a) Contralateral BAEP, median nerve and facial nerve
✔✔During middle or posterior fossa surgery, what structure is most at risk?
a) Cerebellum
b) Brainstem
c) Optic Nerve
d) Spinal Cord - ✔✔b) Brainstem
✔✔In posterior fossa surgery, an increase in the III-V interpeak interval would most
likely be due to:
a) Traction on the cerebellum
b) Compression of the upper midbrain
c) Traction on the acoustic nerve
d) Fluid in the middle ear - ✔✔a) traction on the cerebellum
✔✔What muscle would you monitor for EMG activity for cranial nerve XII?
a) Tongue
b) Trapezius
c) Masseter
d) Frontalis - ✔✔a) tongue
✔✔If CN VII were transected, you would get:
a) Absence of all waves I-V
b) Increased I-III latency
c) Loss of wave V only
,d) No changes - ✔✔d) No changes
✔✔Loss of BAEP's during drilling of the internal auditory canal is most likely due to:
a) Disruption of the blood supply
b) Compression of the brainstem
c) Transection of the auditory nerve
d) Artifact from the drill - ✔✔d) Artifact from the drill
✔✔What would be the effect of fluid in the internal auditory canal?
a) Increase of the absolute latencies
b) Increased wave amplitudes
c) Increased I-V latency
d) Loss of all waves - ✔✔a) increase of the absolute latencies
✔✔The prominent wave for monitoring BAEP's is:
a) Wave I
b) Wave III
c) Wave V
d) ECoG - ✔✔c) Wave V
✔✔Which of these can enhance the wave I amplitude?
a) Use condensation instead of rarefaction
b) Increase click intensity
c) Decrease sweep speed
d) Increase rep rate - ✔✔b) Increase click intensity
✔✔What is the MINIMUM acceptable sweep for BAEPs?
a) 5 msec
b) 15 msec
c) 25 msec
d) 35 msec - ✔✔b) 15 msec
✔✔If wave I is present in the contralateral ear montage, this could be caused by:
a) The wrong click polarity
b) Insufficient contralateral masking
c) Too rapid rep rate
d) Stimulating the wrong ear - ✔✔b) insufficient contralateral masking
,✔✔The intraoperative BAEP is most likely to be obscured by:
a) Patient position
b) Eye movement
c) Muscle artifact
d) Warming blanket - ✔✔c) muscle artifact
✔✔An optimal rep rate for BAEP's is:
a) 4 Hz
b) 31 Hz
c) 66 Hz
d) 72 Hz - ✔✔b) 31 Hz
✔✔Contralateral ear masking should be at:
a) 160 dB SPL
b) 60 dB HL
c) 60 dB SL
d) 75 dB SPL - ✔✔c) 60 dB SL
✔✔The peak equivalent SPL of a click should be:
a) 500 Hz
b) 3000 Hz
c) 5000 Hz
d) 10,000 Hz - ✔✔b) 3000 Hz
✔✔Which of the following potentials will change with click polarity?
a) Wave I latency
b) I-V interpeak
c) Wave V latency
d) Wave V amplitude - ✔✔d) Wave V amplitude
✔✔The proper filter settings for recording BAEP's are:
a) 1-25 to 2500-3000 Hz
b) 1-250 Hz
c) 500-5000 Hz
d) 1-1000 Hz - ✔✔a) 1-25 to 2500-3000 Hz
✔✔If unavoidable muscle artifact is present in the BAEP, you can change the filters to:
, a) 500-1000 Hz
b) 100-200 to 1500 Hz
c) 10-500 Hz
d) 1-1000 Hz - ✔✔b) 100-200 to 1500 Hz
✔✔Hearing level (HL) is defined by:
a) An individual's hearing threshold
b) The average hearing threshold of a normal population
c) The absolute sound pressure relative to atmospheric pressure
d) A table of clinical values - ✔✔b) The average hearing threshold of a normal
population
✔✔Sensation level (SL) is defined by:
a) An individual's hearing threshold
b) The average hearing threshold of a normal population
c) The absolute sound pressure relative to atmospheric pressure
d) A table of clinical values - ✔✔a) An individual's hearing threshold
✔✔In the presence of irreducible artifact, the filters may be set at 100-200 - 1000 Hz for
recording intraoperative:
a) SSEPS
b) EMG
c) MEPs
d) BAEPs - ✔✔d) BAEPs
✔✔Wave V of the BAEP is most affected by:
a) Anesthesia below 1 MAC
b) Retraction
c) Muscle relaxants
d) Temperature changes - ✔✔b) retraction
✔✔If the latency of Wave III of the BAEP is 4.5 using tube inserts it will be:
a) 5.4 using headphones
b) The same using headphones
c) 3.6 using headphones
d) 5.4 using small inserts - ✔✔c) 3.6 using headphones
✔✔The filter settings for recording BAEPs intraoperatively should be:
a) 100-300 to 10,000 Hz
