EEG

Question 1

Function

Answer 1

To record electricity (voltage difference) in time in different places of cortical areas

Question 2

Why can we use it only in the brain?

Answer 2

Because of neuron’s structure: inhibitory or activating synaptic potentials is measured

Question 3

Field potentials

Answer 3

Spatial and temporal average of extracelular currents generated by a group of neurons

Question 4

When do we perform a sleep EEG?

Answer 4

Epilepsy diagnosis
Sleep staging and quantification
Sleep pathologies

Question 5

When do we perform a standard EEG?

Answer 5

Conscience level alteration
Paroxystic episodes: spells, seizures
Cognitive function decrease (dementia)
Brain maturity evaluation (newborns)
Death diagnosis

Question 6

Interpretation

Answer 6

Brain or not brain
Normal or abnormal
Not normal —> what does it mean?
- Distribution
- Location
- Timing, conditions
- Patterns

Question 7

EEG waves

Answer 7

Can be normal or not depending on the age and condition of the patient

Question 8

Spike followed by slow wave

Answer 8

Epilepsy

Question 9

Tryphasic waves

Answer 9

Encephalopathy