EDT Evoked Potentials 3

Question 1

What filter bandpass setting is typically recommended for somatosensory evoked potential (SSEP) recordings?

Accepted Answer

30–3000 Hz

Answer

0.1–70 Hz

Answer

1–15 Hz

Answer

100–10,000 Hz

Question 2

In the 10-20 electrode placement system, where is the Oz electrode positioned for VEP recordings?

Accepted Answer

Occipital midline, 10% of the nasion-inion distance above the inion

Answer

Frontal midline at the hairline

Answer

Vertex (top of the skull)

Answer

Right occipital region lateral to midline

Question 3

Which type of artifact most frequently contaminates evoked potential recordings and is the most common technical challenge?

Accepted Answer

Muscle (EMG) artifact from patient tension or movement

Answer

Cardiac R-wave artifact

Answer

60 Hz power line interference

Answer

DC electrode drift

Question 4

What is the recommended minimum number of averages for reliable cortical SSEP recording, with replication required?

Accepted Answer

200–500 averages

Answer

10–20 averages

Answer

50–100 averages

Answer

1000–2000 averages

Question 5

The P37 component in lower extremity tibial nerve SSEPs is generated by which anatomical structure?

Accepted Answer

Paracentral lobule of the contralateral primary somatosensory cortex

Answer

Thalamus

Answer

Lumbar spinal cord dorsal horn

Answer

Popliteal fossa nerve trunk

Question 6

Which SSEP finding indicates a lesion between the cervical spinal cord and the cortex?

Accepted Answer

Preserved subcortical N13 response with absent or delayed cortical N20 response

Answer

Absent Erb's point potential with a normal cortical N20 response

Answer

Prolonged peripheral conduction time with a normal central conduction time

Answer

Increased amplitude of the cortical response with normal latency

Question 7

What analysis time (sweep duration) is typically used for upper extremity median nerve SSEP recordings?

Accepted Answer

50–60 ms

Answer

500 ms

Answer

1–2 ms

Answer

200 ms