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RPSGT > Second 50 > Flashcards

Second 50 Flashcards

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1
Q

What is the best sensitivity setting for an EEG channel?

A

7 uV / mm or 70 uV/cm

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2
Q

Which montage usually includes a full EEG hookup in order to rule out the possibility of seizure activity?

A

REM behavior disorder

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3
Q

Which montage includes a pressure and airflow channel from a DC device?

A

CPAP

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4
Q

What percentage of the circumference of the head is T5 from T3?

A

10%

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5
Q

Where should the chin EMG electrodes be placed?

A

Above and below the chin

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6
Q

Which electrode site is not usually used in a baseline montage?

A

Arm EMG

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7
Q

G2 (exploring electrode) detects a voltage of -20 uV. The output voltage is 50 uV. What voltage did G1 (reference electrode) detect?

A

-70 uV (exploring electrode minus output voltage -20 -50 = -70)

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8
Q

Which muscle are the leg EMG electrodes placed on?

A

Anterior tibialis

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9
Q

G1 and G2 both equal -25 uV. What is the output voltage?

A

0 uV

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10
Q

Which electrode is located to the left of Cz?

A

C3

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11
Q

In standard placement for EOG electrodes, what happens when the pt looks up?

A

The channels move toward one another

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12
Q

If G1 (reference) is -80 uV, and the output voltage is 20 uV, what is the voltage of G2 (exploring)?

A

-100 uV ( -80 - -100) = -80 +100

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13
Q

Which electrode site is half the distance Fp2 to T4?

A

F8

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14
Q

What percentage of the vertical head measurement (nasion to inion) is Pz from the inion?

A

30%

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15
Q

Ear to ear measures 36 cm. What is the distance from the left ear to T3?

A

3.6 cm

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16
Q

The measurement from T6 to Pz is 8 cm. What is the distance from P4 to Pz?

A

4 cm

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17
Q

The measurement from F7 to F3 is 6 cm. What is the distance from F3 to Fz?

A

6.0 cm

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18
Q

What electrode site is located half the distance from O2 to C4 ?

A

P4

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19
Q

Which electrode site is located 10% above the inion?

A

Oz

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20
Q

A stress loop is helpful for which electrodes?

A

Leg EMGs

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21
Q

What is the likely cause of a high amplitude, low frequency artifact in the EEG?

A

Sweat artifact

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22
Q

What is verified during the time axis alignment check?

A

Vertical pen alignment

23
Q

What is the best way to correct a 60 Hz artifact in the leg EMG?

A

Re-apply these electrodes

24
Q

Electrical interference can be prevented if …?

A

The impedances of input electrodes are similar

25
Q

What is acceptable current leakage in equipment?

A

Less than 100 uA for safety

26
Q

Which sensor generates its own voltage and may be plugged directly into the headbox?

A

Thermocouple and Piezo-electric crystal band

27
Q

A ground loop may occur when…?

A

The pt is attached to more than one diagnostic device, each with its own patient ground connection.

28
Q

When should notch filters be used?

A

Only when absolutely necessary, never routinely

29
Q

Electrical baseline refers to….?

A

The starting position for pen deflection when powered on, but no signal is detected by the amplifier, and also when the same signal is received by both inputs.

30
Q

High and unequal electrode impedances will result in…?

A

60 Hz artifact

31
Q

What causes electrode popping?

A

Loose electrodes or direct pressure against an electrode

32
Q

If slow wave artifact is seen in three EEG channels with the same G1 (reference), an appropriate response is to…?

A

Re-reference the input to a backup electrode.

33
Q

If a high frequency artifact appears in a single EEG channel, an appropriate response is to…?

A

Change the signal input to a backup exploring electrode (G2).

34
Q

What may cause a strong EKG artifact in an EMG channel?

A

Poor electrode placement or high impedances

35
Q

If a LOW frequency artifact appears in the EEG and EOG channels, what should be done?

A

Attempt to cool the pt and room (sweat artifact) and temporarily raise the low frequency filters to 1 Hz

36
Q

Double referencing electrodes may be beneficial for which artifact?

A

EKG artifact in the EEG or eye channels

37
Q

With artifact, changing the filters is…?

A

Only effective if underlying signals are intact and only as a last result when the artifact can’t be corrected

38
Q

The preferred type of amplifier is…?

A

Differential

39
Q

If G1 (reference) is more negative than G2 (exploring), the pen will…?

A

The pen will deflect upward (negative)

40
Q

How far will the pen deflect if sensitivity is 10 uV/cm and the input voltage is 75 uV?

A

75 mm or 7.5 cm

41
Q

What is the input voltage if the sensitivity is 5 uV/cm and the pen deflection is 10 cm?

A

50 uV

42
Q

In most sleep systems which device is the patient head box directly plugged into?

A

AC amplifier

43
Q

Which channel is DC?

A

SpO2

44
Q

What is the primary difference between thermisters and thermocouples?

A

Thermocouples generate their own electricity (dissimilar metals) while thermisters do not.

45
Q

Which device uses a cuff and bladder system?

A

Pneumatic respiratory transducer (in belt)

46
Q

Common Mode Rejection Ratio (CMRR) refers to…?

A

The ability of an amplifier to eliminate unwanted signals

47
Q

What device stores and releases energy in an alternating current circuit?

A

Capacitor

48
Q

What is the max allowable leakage in diagnostic equipment?

A

100 uA

49
Q

A frequency response curve is …?

A

A visual representation of the amplifier’s ability to eliminate frequencies outside the filter settings

50
Q

The rise time is the time it takes the pen to reach what percentage of its deflection?

A

63%

51
Q

The fall time is the amount of time for the pen to return to ___ of its baseline during amplifier calibrations

A

37%

52
Q

The pen’s vertical position when the power is turned off is called the…?

A

Mechanical baseline

53
Q

During amplifier calibrations, the display signals are…?

A

50 uV and -50 uV

RPSGT (4 decks)

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