EEG findings

Question 1

CJD (sporadic only, does not apply to variant)

Answer 1

Early on: non specific slowing

Later: periodic biphasic and triphasic synchronous sharp wave complexes superimposed on a slow background rhythm

Question 2

Huntington’s

Answer 2

Low voltage EEG, in particular no alpha (flattening)

Question 3

delirium

Answer 3

Diffuse slowing, decreased alpha, increased theta and delta

Question 4

Delirium tremens

Answer 4

Hyperactive trace, fast

Question 5

Alzheimer’s

Answer 5

Reduced alpha and beta, increased delta and theta

Question 6

normal ageing

Answer 6

Diffuse slowing, which can be focal or diffuse, if focal most commonly seen in the left temporal region

Question 7

encephalopathy

Answer 7

diffuse slowing