2024 CNIM Section II Latest Questions With Complete Grade A Answers
- An objective measure of meaningful change to use to warn the surgeon is the
Answer: 50% amplitude decrease.
- D-Wave amplitude_ and latency as you move caudally down the spinal cord.
Answer: decreases, increases
- Where is the BAEP wave V generated?
Answer: Midbrain
- Electrocochleogram (EcochG)
Answer: All are correct
- The absence of N20 obligate waveform may reflect a
Answer: Subcortical lesion of the ascending somatosensory pathway
- What is the effect of nerve ischemia on EMG?
Answer: No detectible EMG activity
7. The stimulation rate most suitable for tibial SSEP monitoring is:
Answer: 2.1 Hz.
- According to the ACNS guidelines, what is the most appropriate repetition rate for SSEP
stimulation?
Answer: 2-8/sec
9. Contralateral masking should be used during BAEP monitoring to:
Answer: Prevent crossover responses
- Which cranial nerves are at greatest risk of injury during a retrosigmoid acoustic neuroma
surgical approach?
Answer: CN 7 and 8
- According to ACNS Guidelines, which of the following will result in reduction of
stimulus artifact and rapid acquisition of data?
Answer: Alternating polarity and a stimulus rate of 30.1 p/sec.
- When monitoring from external anal sphincter, where should electrodes be placed?
Answer: 2 finger breadths laterally from the edge of the rectum
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- If you have noise in ALL SSEP channels, replacing which electrode would be most
beneficial?
Answer: Ground electrode
- A risk associated with mapping of the motor cortex is
Answer: Seizures
- During pre-operative posterior tibial nerve somatosensory evoked potentials, which of the
following would be the best ipsilateral location for the ground electrode?
Answer: Calf
- To display median nerve SSEP response as an upward deflection, which of the following
must be known?
Answer: Waveform polarity and polarity convention of the amplifier inputs
- During carotid endarterectomy, Spectral Edge Frequency is usually set to
Answer: 90%-97%
- Which of the following anesthetic agents may increase the amplitude of cortical
potentials?
Answer: Etomidate
- Cervicomedullary signal
Answer: P31
20. In a full-field pattern reversal VEP, the maximal response is seen at:
Answer: MO
- Due to immature myelination and smaller neural fibers, children may re- quire to obtain
TCEMEP responses.
Answer: A higher stimulation intensity
- An EEG frequency of 4-7 Hz
Answer: Theta
- Which of the following is the largest bio-potential source of artifact for the BAEP?
Answer: Electromyogram
- Which enzyme abnormality can cause TOF to show 0/4 twitches when no neuro muscular
blockade has been given since induction?
Answer: Pseudo- cholinesterase deficiency
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