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RPSGT > First 50 > Flashcards

First 50 Flashcards

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1
Q

Best filter settings

A

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

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2
Q

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

A

Waves move toward each other

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3
Q

What is the purpose of low frequency filter?

A

Eliminate undesired low frequencies

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4
Q

The symbol G1 and G2 represent…?

A

Exploring electrode (G1) and Reference electrode (G2)

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5
Q

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

A

-50 uV

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6
Q

What does a differential amplifier do?

A

It measures the difference between two signals

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7
Q

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

A

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

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8
Q

How is wave amplitude determined?

A

Compare the wave to a calibration signal of known value

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9
Q

Amplitude is a measure of …?

A

Voltage

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10
Q

What is the purpose of a high frequency filter?

A

To filter out undesirable fast frequencies

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11
Q

What is the sensitivity setting?

A

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

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12
Q

What is an appropriate EEG sensitivity setting?

A

5 uV/ mm or 50 uV/cm

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13
Q

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

A

It will reduce the pen deflection by half

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14
Q

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

A

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

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15
Q

What is an appropriate filter setting for an EEG channel?

A

LFF 0.3 Hz, HFF 30 Hz

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16
Q

What is an appropriate filter setting for an EMG channel?

A

LFF 10 Hz, HFF 100 Hz

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17
Q

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

A

LFF 0.1, HFF 0.5

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18
Q

What is a major difference between AC and DC amplifiers?

A

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

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19
Q

The recording of eye movements is based on…?

A

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

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20
Q

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

A

Downward movement in E2, upward movement in E1

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21
Q

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

A

Height / speed

22
Q

EEG amplitude is measured in…?

A

Microvolts

23
Q

EEG frequency is measured in…?

A

Hertz (Hz)

24
Q

What is the equation regarding sensitivity?

A

Voltage / pen deflection (uV/mm)

25
Q

The low frequency filter is associated with…?

A

The time constant

26
Q

What is the recommended impedance level for EEG electrodes?

A

Less than 5k ohms

27
Q

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

A

7.2 cm

28
Q

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

A

3.2 cm

29
Q

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

A

7.0 cm

30
Q

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

A

8.0 cm

31
Q

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

A

2.8 cm

32
Q

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

A

12.0 cm

33
Q

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

A

F4

34
Q

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

A

T5

35
Q

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

A

6 cm

36
Q

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

A

5.0 cm

37
Q

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

A

F4

38
Q

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

A

12.5

39
Q

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

A

Cz

40
Q

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

A

G1 minus G2 equals 50 uV

41
Q

What can happen if referencing electrodes have dissimilar metals?

A

Galvanized skin response

42
Q

Which lead is a DC channel?

A

SpO2

43
Q

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

A

frequency

44
Q

A change in sensitivity produces a change in the —– of a wave.

A

Height

45
Q

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

A

Filter

46
Q

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

A

0.5 Hz

47
Q

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

A

35 Hz

48
Q

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

A

70 Hz (best option in question in the book)

49
Q

Which high frequency filter is preferred in the airflow channel?

A

5 Hz (best option in question in the book)

50
Q

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

A

EEG

RPSGT (4 decks)

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