ACNS

Question 1

3 reasons why EO/EC are important to be performed on clinical EEG

Answer 1

1. Some rhythms can be masked by alpha activity with EC
2. Helps attenuate cerebral activity from eye movement
3. Some paroxysmal activity can only be seen with EO/EC

Question 2

What is the minimal amount of recording time acceptable when performing clinical EEG?

Answer 2

At least 20 min satisfactory recording

Question 3

What is the correct documentation a clinical EEG record should contain

Answer 3

1. name and age of patient
2. date
3. ID number
4. name/ initials of tech

Question 4

What are the appropriate filter settings during an ECS/ECI study?

Answer 4

HFF= no less then 30 hz
LFF= no more then 1 hz

Question 5

What is the interelectrode distance requirement when performing an ECS/ ECI study?

Answer 5

At least 10 cm

Question 6

What are the interelectrode impedance requirements when performing on EEG to determine ECS/ECI?

Answer 6

Under 10,000 ohms but more than 100 ohms

Question 7

What is the minimal number of scalp electrodes required when performing an EEG to determine ECI?

Answer 7

A full set should used whenever possible

Question 8

What electrode impedance requirements when performing a clinical EEG?

Answer 8

Should not exceed 10,000ohms

Question 9

Why is the use of the 60 hz filter discouraged when performing EEG?

Answer 9

60 hz filter can distort or attenuate or attenuate spikes and should only be used when other measures against 60 hz fail

Question 10

What are the appropriate filter setting when performing clinical EEG?

Answer 10

LFF= no higher than 1 hz 
HFF= no lower than 70 hz

Question 11

What is the minimal number of scalp electrodes required when performing clinical EEG?

Answer 11

All Z1 electrodes and placement following the 10-20 system should be used