Assessment of Brain Fxn (Lecture 18) Flashcards Preview

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Flashcards in Assessment of Brain Fxn (Lecture 18) Deck (14):
1

EEG measures electrical activity from neurons in what part of the brain?

cortex

2

what happens to the frequency of the wave forms in an EEG as you become less alert?

lower frequency

3

info that can be determined from an EEG

seizure risk
look for areas of cortex dysfunction (ie Coma)
diagnose herpes encephalitis
evaluate fetal brain age
brain death
sleep studies

4

can you use an EEG to determine location of a specific function in the brain?

no

5

what is electrocerebral silence

brain death, no waves

6

advantages of EEG

gives info about what is going on in cerebral cortex at any given moment
no risks

7

disadvantages of EEG

info very general
only evaluate cortex
cannot give precise location

8

3 types of evoked potential

somatosensory (stimulate median nerve and measure somatosensory cortex)
auditory (listen to clicks and measure auditory cortex)
visual (focus on moving checker square and measure visual cortex)

9

what do evoked potentials tell you

info about activity in brain in response to specific stimuli (time it takes for response in brain)

10

how is a PET scan performed?

radioactive glucose injected into body
after ~1hr, images are taken
causes active areas of the brain to light up

11

advantages of fMRI

can detect small changes

12

disadvantages of fMRI

resolution is not good
pt has to stay still
cant use if pt has pacemaker or metal in body
expensive
loud

13

advanages of PET

more precise when combined with CT
substances other than glucose can be made radioactive

14

disadvantages of PET

injections required
VERY expensive
pt must be cooperative