CNIM Brainstem Auditory Evoked Potentials (BAEP)

Question 1

Which surgical procedure most commonly requires intraoperative BAEP monitoring?

Accepted Answer

Acoustic neuroma (vestibular schwannoma) resection

Answer

Lumbar spinal fusion

Answer

Hip arthroplasty

Answer

Anterior cervical discectomy

Question 2

Wave V of the BAEP originates from which neural structure?

Accepted Answer

Lateral lemniscus and inferior colliculus

Answer

Cochlear nerve (cranial nerve VIII)

Answer

Superior olivary complex

Answer

Auditory cortex

Question 3

The standard acoustic stimulus used to elicit BAEPs intraoperatively is:

Accepted Answer

Broadband click stimulus

Answer

Pure tone at 1000 Hz

Answer

Speech noise

Answer

Sinusoidal tone at 4000 Hz

Question 4

An increase in Wave V latency of more than 1 ms from baseline during posterior fossa surgery is considered:

Accepted Answer

A significant alarm criterion

Answer

Normal variability

Answer

An electrode artifact

Answer

A sign of improved conduction

Question 5

Which BAEP wave reflects activity at the level of the cochlear nerve (cranial nerve VIII)?

Accepted Answer

Wave I

Answer

Wave III

Answer

Wave V

Answer

Wave VII

Question 6

To prevent masking noise from the non-test ear from affecting BAEP recordings, what is applied to the contralateral ear?

Accepted Answer

Contralateral white noise masking

Answer

Earplugs only

Answer

Contralateral click stimulation

Answer

Nothing is needed