Practice Test GeeksCNIM - Certification for Neurophysiological Intraoperative Monitoring Practice Test
← All CNIM Flashcard Decks

Brainstem Auditory Evoked Potentials (BAEP) Flashcards

6 cards from real CNIM practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 6 Brainstem Auditory Evoked Potentials (BAEP) flashcards as text

  1. When monitoring hearing preservation during acoustic neuroma surgery, which BAEP parameter is most predictive of postoperative hearing outcome?

    Answer: Wave V latency and amplitude preservation throughout surgery

    Preservation of Wave V latency and amplitude throughout surgery is most predictive of postoperative hearing preservation after acoustic neuroma resection.

  2. Which electrode placement is used to record the Fz (frontal) reference for BAEP monitoring?

    Answer: Frontal midline (forehead)

    Fz (mid-forehead) serves as the non-inverting reference electrode in BAEP recordings, paired with the ipsilateral earlobe or mastoid as the inverting input.

  3. Hypothermia during posterior fossa surgery affects BAEPs by:

    Answer: Prolonging all wave latencies without amplitude loss

    Hypothermia slows neural conduction, prolonging all BAEP wave latencies in a predictable fashion without abolishing responses, which must be accounted for when interpreting intraoperative changes.

  4. The standard BAEP amplitude alarm criterion during intraoperative monitoring is:

    Answer: 50% decrease in Wave V amplitude

    A 50% or greater decrease in Wave V amplitude from baseline is the standard alarm threshold for BAEPs, complementing the 1 ms latency criterion.

  5. During microvascular decompression (MVD) for hemifacial spasm, BAEP monitoring is used because:

    Answer: The auditory nerve (CNVIII) runs adjacent to the facial nerve in the posterior fossa and can be injured during surgery

    During MVD for hemifacial spasm, the auditory nerve runs near the facial nerve root entry zone; BAEP monitoring protects hearing by detecting auditory pathway compromise during dissection.

  6. Which technical factor most commonly causes BAEP artifact that mimics waveform deterioration intraoperatively?

    Answer: Stimulus delivery system failure (earphone disconnection or debris)

    Earphone disconnection, cerumen blockage, or fluid in the ear canal can prevent stimulus delivery, causing BAEP waveform loss that mimics neural injury but is purely technical.

How this page was made: written with AI tools and published by Nathan Beja, founder of Practice Test Geeks, who is responsible for its content. Exam facts are checked against the official sources listed below. Not reviewed by a subject-matter expert. Editorial policy

Sources & references

Exam facts on this page (fees, format, dates, passing scores) are checked against these official sources; the date is our last check. Editorial policy

  1. abret.org — Late registration, score validity, test delivery, passing score, registration deadline, retake policy, score release, test dates, time limit, fees · verified Nov 2026