ABEM Evoked Potentials & Late Response Studies 2

Question 1

Following median nerve stimulation, which SSEP peak represents activation at the level of the brachial plexus (Erb's point)?

Accepted Answer

N9

Answer

N13

Answer

N20

Answer

P25

Question 2

What is the primary clinical application of brainstem auditory evoked potentials (BAEPs)?

Accepted Answer

Evaluating auditory pathway integrity and detecting acoustic neuromas or brainstem lesions

Answer

Diagnosing carpal tunnel syndrome and median neuropathy

Answer

Assessing brachial plexus root avulsion injuries

Answer

Measuring cortical motor function and connectivity

Question 3

In pattern-reversal visual evoked potentials (VEPs), the P100 wave is generated primarily by which structure?

Accepted Answer

Primary visual cortex (occipital cortex, V1)

Answer

Optic chiasm

Answer

Lateral geniculate nucleus of the thalamus

Answer

Optic nerve proximal segment

Question 4

A unilaterally delayed P100 latency with preserved amplitude on VEP testing is most characteristic of which condition?

Accepted Answer

Multiple sclerosis with a history of optic neuritis

Answer

Diabetic retinopathy with macular involvement

Answer

Bilateral cataracts reducing stimulus contrast

Answer

Macular degeneration with central scotoma

Question 5

Which wave of the brainstem auditory evoked potential (BAEP) is generated by the distal cochlear nerve?

Accepted Answer

Wave I

Answer

Wave III

Answer

Wave V

Answer

Wave VII

Question 6

The I-V interpeak latency in BAEP studies primarily reflects conduction through which segment?

Accepted Answer

Brainstem conduction from the cochlear nerve (Wave I) to the inferior colliculus (Wave V)

Answer

Peripheral auditory pathway from cochlea to cochlear nerve

Answer

Cortical processing of auditory information in temporal lobe

Answer

Middle ear ossicular chain transmission time

Question 7

In median nerve SSEPs, which peak represents the initial cortical response recorded over the contralateral scalp?

Accepted Answer

N20

Answer

N9

Answer

N13

Answer

N18