Chapter 5: IOM

Question 1

What is the superior type of evoked potential for patients with suspected MS?

Answer 1

VEP (66% will be abnormal)

Question 2

Median SSEP: absent N9, normal P14, N20

Answer 2

considered normal, can be technical error

The presence of brainstem P14 and cortical potentials (N20) indicated the response is propagating

N9 originates from the brachial plexus
P14 from the lower medulla,
N20 from the primary somatosensory cortex.

Question 3

Normal BAEP?

Answer 3

Question 4

How can the P100 waveform be distorted by

Answer 4

larger check size
faster reversal rates

Question 5

PRVEP is most suitable for

Answer 5

psychogenic blindness

Question 6

d waves vs m waves on MEPs

Answer 6

D-waves, originating from the motor cortex and traveling down the corticospinal tract, are more sensitive to subtle changes and can predict long-term motor deficits with high specificity.

m-MEPs, on the other hand, are generated from cortex to muscle and are more sensitive to transient or temporary neurological deficits.

Question 7

median nerve SSEP

Answer 7

know all the points and times