First 50

Question 1

Best filter settings

Answer 1

EEG/EOG 0.3-0.1/35, EMG 10/70

Question 2

If E2 channel is 4 and E1 channel is 5, what do waves look like when pt looks up?

Answer 2

Waves move toward each other

Question 3

What is the purpose of low frequency filter?

Answer 3

Eliminate undesired low frequencies

Question 4

The symbol G1 and G2 represent…?

Answer 4

Exploring electrode (G1) and Reference electrode (G2)

Question 5

What is the output of the following: G1 has -100 uV signal, G2 has -50 uV signal ?

Answer 5

-50 uV

Question 6

What does a differential amplifier do?

Answer 6

It measures the difference between two signals

Question 7

The frequency of an EEG signal can be determined by…?

Answer 7

Frequency is cycles/second or Hz…count the number of cycles in one second

Question 8

How is wave amplitude determined?

Answer 8

Compare the wave to a calibration signal of known value

Question 9

Amplitude is a measure of …?

Answer 9

Voltage

Question 10

What is the purpose of a high frequency filter?

Answer 10

To filter out undesirable fast frequencies

Question 11

What is the sensitivity setting?

Answer 11

The ratio of input signal voltage to the amplitude of the pen deflection

Question 12

What is an appropriate EEG sensitivity setting?

Answer 12

5 uV/ mm or 50 uV/cm

Question 13

When adjusting the sensitivity from 5 uV/mm to 10 uV/mm, what will happen?

Answer 13

It will reduce the pen deflection by half

Question 14

The standard paper speed used for a sleep study is …?

Answer 14

10 mm/sec (this creates a 30 second epoch)

Question 15

What is an appropriate filter setting for an EEG channel?

Answer 15

LFF 0.3 Hz, HFF 30 Hz

Question 16

What is an appropriate filter setting for an EMG channel?

Answer 16

LFF 10 Hz, HFF 100 Hz

Question 17

What is an appropriate filer setting for airflow / respiratory effort?

Answer 17

LFF 0.1, HFF 0.5

Question 18

What is a major difference between AC and DC amplifiers?

Answer 18

AC amplifiers have a HFF, DC amplifiers do not (because changes in voltages are very slow)

Question 19

The recording of eye movements is based on…?

Answer 19

The electrical potential difference between the cornea (positive) and the retina (negative)

Question 20

E1 and E2 are referenced to opposite mastoids. An eye movement to the right should result in…?

Answer 20

Downward movement in E2, upward movement in E1

Question 21

Amplitude is the measurement of the ____of a waveform, while frequency is the measurement of the ____ of a waveform.

Answer 21

Height / speed

Question 22

EEG amplitude is measured in…?

Answer 22

Microvolts

Question 23

EEG frequency is measured in…?

Answer 23

Hertz (Hz)

Question 24

What is the equation regarding sensitivity?

Answer 24

Voltage / pen deflection (uV/mm)

Question 25

The low frequency filter is associated with...?

Answer 25

The time constant

Question 26

What is the recommended impedance level for EEG electrodes?

Answer 26

Less than 5k ohms

Question 27

If the measurement from nasion to inion is 36 cm, what is the distance from Cz to Pz?

Answer 27

7.2 cm

Question 28

If the measurement from nasion to inion is 32 cm, what is the distance from the inion to Oz?

Answer 28

3.2 cm

Question 29

The distance from Cz to T4 is 14 cm. What is the distance from C4 to T4?

Answer 29

7.0 cm

Question 30

The distance from ear to ear is 40 cm. What is the difference from Cz to C3?

Answer 30

8.0 cm

Question 31

The pt's head circumference is 56 cm. What is the distance from Oz to O1?

Answer 31

2.8 cm

Question 32

The pt's head circumference is 60 cm. What is the distance from O2 to T4?

Answer 32

12.0 cm

Question 33

Which EEG site is half the distance from F8 to Fz?

Answer 33

F4

Question 34

Which EEG site is half the distance from O1 to T3?

Answer 34

T5

Question 35

The distance from FP1 to O1 through C3 is 24 cm. What is the distance from C3 to P3?

Answer 35

6 cm

Question 36

The distance from Fp2 to T4 is 10 cm. What is the difference from Fp2 to F8?

Answer 36

5.0 cm

Question 37

Which electrode site is half the distance between Fp2 and C4?

Answer 37

F4

Question 38

The circumference of the pt's head is 50 cm. What is the difference from T3 to Oz?

Answer 38

12.5

Question 39

Which electrode site is half the distance from T3 to T4?

Answer 39

Cz

Question 40

If G1 reads 60 uV, and G2 reads 10 uV, what is the output signal's voltage?

Answer 40

G1 minus G2 equals 50 uV

Question 41

What can happen if referencing electrodes have dissimilar metals?

Answer 41

Galvanized skin response

Question 42

Which lead is a DC channel?

Answer 42

SpO2

Question 43

The rate at which a wave repeats itself or oscillates is...?

Answer 43

frequency

Question 44

A change in sensitivity produces a change in the ----- of a wave.

Answer 44

Height

Question 45

The frequency of a waveform can be altered by adjusting the -----?

Answer 45

Filter

Question 46

What low frequency filter setting is preferred in the EEG channel?

Answer 46

0.5 Hz

Question 47

What is the preferred high frequency filter setting in the EEG channel?

Answer 47

35 Hz

Question 48

What is the preferred high frequency filter in the EMG channel?

Answer 48

70 Hz (best option in question in the book)

Question 49

Which high frequency filter is preferred in the airflow channel?

Answer 49

5 Hz (best option in question in the book)

Question 50

In which channel is the shape of the waves most important?

Answer 50

EEG