CNIM Brainstem Auditory Evoked Potentials (BAEP) 2

Question 1

Compared to SSEPs, BAEPs are generally considered more resistant to the effects of anesthetic agents because:

Accepted Answer

The auditory brainstem pathway is subcortical and less sensitive to anesthetic suppression

Answer

BAEPs reflect subcortical brainstem activity which is relatively resistant to anesthetic suppression, unlike cortical responses that are highly sensitive to anesthetic agents.

Question 2

Complete loss of all BAEP waves during posterior fossa surgery most likely indicates:

Accepted Answer

Severe brainstem compression or ischemia requiring immediate surgical attention

Answer

Complete loss of all BAEP waves is a critical alarm indicating severe auditory pathway compromise, brainstem ischemia, or significant compression requiring immediate surgical intervention.

Question 3

The I-V interpeak latency in BAEP monitoring reflects conduction through which neural segment?

Accepted Answer

Cochlear nerve to inferior colliculus (central auditory brainstem pathway)

Answer

The I-V interpeak latency reflects central auditory conduction time from the cochlear nerve through the entire brainstem auditory pathway to the inferior colliculus.

Question 4

During posterior fossa surgery, an isolated loss of Wave I with preserved Wave V most likely indicates:

Accepted Answer

Cochlear or distal nerve VIII injury

Answer

Isolated Wave I loss with preserved Wave V suggests peripheral cochlear or distal cranial nerve VIII injury rather than central brainstem involvement.

Question 5

What is the typical stimulus repetition rate used for intraoperative BAEP recording?

Accepted Answer

10–20 Hz

Answer

BAEP stimuli are typically delivered at 10–20 Hz, balancing the need for rapid averaging with avoiding response habituation or overlapping echoes.

CNIM - Certification for Neurophysiological Intraoperative Monitoring Practice Test

CNIM - Certification for Neurophysiological Intraoperative Monitoring Practice Test

CNIM Brainstem Auditory Evoked Potentials (BAEP) 2