Polysomnography Board Prep
.
- 1.
The E2 electrode is placed out and up from the outer canthus of the right eye, and E1 is placed out and down from the outer canthus of the left eye. If the E2 channel on the study is channel 4, and E1 is channel 5, what will the waves on these channels do when the patient looks up?
- A.
Move toward each other
- B.
Both move up
- C.
Both move down
- D.
Move away from each other
Correct Answer
A. Move toward each other -
- 2.
What is the purpose of the low ferquency filter?
- A.
Eliminating undesired fast frequencies
- B.
Eliminating undesired slow frequencies
- C.
Adjusting signal amplitude
- D.
Calibrating DC amplifiers
Correct Answer
B. Eliminating undesired slow frequencies -
- 3.
What should a technician do first to make sure the proper test is being performed?
- A.
Contact the physician
- B.
Review the chart for the physician's order
- C.
Ask the patient for a chief complaint
- D.
Perform physiological calibrations
Correct Answer
B. Review the chart for the physician's order -
- 4.
The symbol "G1" represents
- A.
The exploring electrode
- B.
The reference electrode
- C.
The patient ground
- D.
The output of a differential amplifier to the study
Correct Answer
A. The exploring electrode -
- 5.
If G1 receives a signal of -100 uV at the same time G2 receives a signal of -50 uV, waht is the output signal?
- A.
-50 uV
- B.
+50 uV
- C.
-150 uV
- D.
+150 uV
Correct Answer
A. -50 uV -
- 6.
Which of the following is a process performed by a differential amplifier?
- A.
Recording the differences in the voltages of two inputs
- B.
Recording the differences in the voltages of the active input and ground
- C.
Recording the differences in the voltages of an exploring electrode and the patient ground connection
- D.
Recording only identical voltages received by its two inputs
Correct Answer
A. Recording the differences in the voltages of two inputs -
- 7.
If G1 and G2 simultaneously receive an input of 50 uV, what is the output signal?
- A.
0
- B.
-100 uV
- C.
+100 uV
- D.
-50 uV
Correct Answer
A. 0 -
- 8.
The frequency of an EEG signal
- A.
Can be determined by counting the number of waveforms recorded during one second
- B.
Can be determined by counting the number of waveforms recorded during one epoch
- C.
Cannot be determined without using a water column manometer
- D.
Depends upon the paper speed
Correct Answer
A. Can be determined by counting the number of waveforms recorded during one second -
- 9.
How is the amplitude of a wave determined?
- A.
By reading the sensitivity setting on the study
- B.
By comparing the relative height of the sleep waveforms against the patient's awake EEG
- C.
By comparing the height of the patient's EEG slow wave tot he patient's alpha waves
- D.
By comparing the height of the waveform against a calibration signal of known value
Correct Answer
D. By comparing the height of the waveform against a calibration signal of known value -
- 10.
The purpose of a high frequency filter is
- A.
To attenuate undesirable fast frequencies
- B.
To attenuate undesirable slow frequencies
- C.
To eliminate undesirable DC voltages from the signal output
- D.
Both B and C are correct
Correct Answer
A. To attenuate undesirable fast frequencies -
- 11.
In polysomnography, what is the sensitivity setting?
- A.
The offset between the electrical and the mechanical baselines
- B.
The ratio of pen response to the settings of the low and high frequency filter settings
- C.
The ratio of input signal voltage to the amplitude of the pen deflection
- D.
The ratio of input signal voltage to the voltage of the calibration signal
Correct Answer
C. The ratio of input signal voltage to the amplitude of the pen deflection -
- 12.
An approbriate EEG sensitivity setting is
- A.
5 uV/mm
- B.
5 uV/cm
- C.
50 uV/cm
- D.
A and C are both correct
Correct Answer
D. A and C are both correct -
- 13.
Amplitude is a measure of
- A.
Impedance
- B.
Voltage
- C.
Current
- D.
Resistance
Correct Answer
B. Voltage -
- 14.
Adjusting the sensitivity from 5 uV/mm to 10 uV/mm will
- A.
Double the pen deflection
- B.
Increase the pen deflection by 5 times
- C.
Reduce the pen deflection by one half
- D.
Reduce the pen deflection by 5 times
Correct Answer
C. Reduce the pen deflection by one half -
- 15.
The standard paper speed used for a sleep study is
- A.
30 mm/sec
- B.
10 mm/sec
- C.
5 mm/sec
- D.
1 mm/sec
Correct Answer
B. 10 mm/sec -
- 16.
Which of the following filter settings would be most appropriate for EEG channels on a sleep study?
- A.
LFF= 10HZ, HFF= 100HZ
- B.
LFF= 1HZ, HFF= 30HZ
- C.
LFF= .3HZ, HFF= 30HZ
- D.
LFF= .1HZ, HFF= .5HZ
Correct Answer
C. LFF= .3HZ, HFF= 30HZ -
- 17.
Which of the following filter settings are the most appropriate for recording EMG channels?
- A.
LFF= 10HZ, HFF= 100HZ
- B.
LFF= 1HZ, HFF= 30HZ
- C.
LFF= .3HZ, HFF= 30HZ
- D.
LFF= .1HZ, HFF= .5HZ
Correct Answer
A. LFF= 10HZ, HFF= 100HZ -
- 18.
Which of the following filter settings should be used for recording airflow and respiratory effort?
- A.
LFF= 10HZ, HFF= 100HZ
- B.
LFF= 1HZ, HFF= 30HZ
- C.
LFF= .3HZ, HFF= 30HZ
- D.
LFF= .1HZ, HFF= .5HZ
Correct Answer
D. LFF= .1HZ, HFF= .5HZ -
- 19.
What is the major difference between AC and DC amplifiers?
- A.
DC amplifiers have a greater sensitivity range than an AC amplifier
- B.
AC amplifiers have a high frequency filter, while DC amplifiers do not
- C.
AC amplifiers have a low frequency filter, while a DC amplifier does not
- D.
DC amplifiers have apolarity switch, while AC amplifiers do not
Correct Answer
B. AC amplifiers have a high frequency filter, while DC amplifiers do not -
- 20.
The quality and accuracy of a sleep study is mostly determined by
- A.
The type of equipment used to collect the data
- B.
Proper electrode application
- C.
The selective use of filters
- D.
The type of software program used to analyze data
Correct Answer
B. Proper electrode application -
- 21.
The purpose of the physiologic calibrations is to
- A.
Establish certain scoring references for the sleep study
- B.
Verify signal derivations for each channel
- C.
Confirm the integrity of the signals
- D.
All of the above
Correct Answer
D. All of the above -
- 22.
The recording of eye movements is based on
- A.
Muscle activity produced by the right and left outer canthus
- B.
Voltages from the frontal EEG's
- C.
The electrical potential difference between the cornea and the retina
- D.
The electrical potential difference between the right eye and the left eye
Correct Answer
C. The electrical potential difference between the cornea and the retina -
- 23.
If the low frequency filter is increased from 0.3Hz to 1Hz in an EEG channel, how will this affect the recording?
- A.
The 1Hz setting will decrease the amplitude of alpha waves
- B.
The 1 Hz setting will decrease the frequency of alpha waves
- C.
The 1Hz setting will decrease the amplitude of slow waves
- D.
A and C are correct
Correct Answer
C. The 1Hz setting will decrease the amplitude of slow waves -
- 24.
The right and left outer canthus electrodes (E2 and E1) are referenced to an opposite mastoid. According to polarity convention, an eye movement to the right should result in
- A.
An upward deflection in both eye channels
- B.
A downward pen deflecion in both eye channels
- C.
An upward pen deflection in the E2 channel and a downward pen deflection in the E1 channel
- D.
A downward pen deflection in the E2 channel and an upward pen deflection in the E1 channel
Correct Answer
D. A downward pen deflection in the E2 channel and an upward pen deflection in the E1 channel -
- 25.
Amplitude is a measurement of the __________ of a waveform, while frequency is a measurement of the ________ of a waveform.
- A.
Soeed, shape
- B.
Shape, speed
- C.
Height, shape
- D.
Height, speed
Correct Answer
D. Height, speed -
- 26.
EEG amplitude is measured in __________, while EEG frequency is measured in _________.
- A.
Microvolts, Hertz
- B.
Volts, Hertz
- C.
Millivolts, Cycles per Second
- D.
Microvolts, Volts
Correct Answer
A. Microvolts, Hertz -
- 27.
Which of the following equations is true regarding sensitivity?
- A.
Sensitivity= pen deflection/voltage
- B.
Voltage= sensitivity/pen deflection
- C.
Sensitivity= voltage/pen deflection
- D.
Pen deflection= sensitivity/voltage
Correct Answer
C. Sensitivity= voltage/pen deflection -
- 28.
The low frequency filter is most closely associated with
- A.
The high frequency filter
- B.
The sensitivity of the amplifier
- C.
The time constant
- D.
The input signal
Correct Answer
C. The time constant -
- 29.
Which of the following are the recommended impedance levels for EEG electrodes?
- A.
< 20,000 ohms
- B.
< 5 ohms
- C.
< 5k ohms
- D.
> 20,000 ohms
Correct Answer
C. < 5k ohms -
- 30.
A sleep study usually includes all but which of the following measurments?
- A.
EOG
- B.
ERG
- C.
Respiratory Effort
- D.
EMG
Correct Answer
B. ERG -
- 31.
The measured distance from the nasion to the inion is 36 cm. What is the distance from Cz to Pz?
- A.
1.8 cm
- B.
3.6 cm
- C.
7.2 cm
- D.
18 cm
Correct Answer
C. 7.2 cm -
- 32.
The measured distance from the nasion to the inion is 32 cm. What is the distance from the inion to Oz?
- A.
1.6 cm
- B.
3.2 cm
- C.
6.4 cm
- D.
16 cm
Correct Answer
B. 3.2 cm -
- 33.
The measured distance from Cz to T4 is 14 cm. What is the distance from C4 to T4?
- A.
1.4 cm
- B.
2.8 cm
- C.
3.5 cm
- D.
7.0 cm
Correct Answer
D. 7.0 cm -
- 34.
The measured distance from ear to ear is 40 cm. What is the distance from Cz to C3?
- A.
2 cm
- B.
4 cm
- C.
8 cm
- D.
10 cm
Correct Answer
C. 8 cm -
- 35.
The circumference of the patient's head is 56 cm. What is the distance from Oz to O1?
- A.
2.8 cm
- B.
5.6 cm
- C.
11.2 cm
- D.
28 cm
Correct Answer
A. 2.8 cm -
- 36.
The circumference of the patients head is 60 cm. What is the distance from O2 to T4?
- A.
3 cm
- B.
6 cm
- C.
12 cm
- D.
15 cm
Correct Answer
C. 12 cm -
- 37.
Which EEG electrode site is half the distance from F8 to Fz?
- A.
F4
- B.
Fp2
- C.
F6
- D.
F2
Correct Answer
A. F4 -
- 38.
Which EEG electrode site is half the distance from O1 to T3?
- A.
Oz
- B.
P3
- C.
C3
- D.
T5
Correct Answer
D. T5 -
- 39.
The distance from Fp1 to O1 through C3 is 24 cm. What is the distance from C3 to P3?
- A.
2.4 cm
- B.
4.8 cm
- C.
6.0 cm
- D.
9.6 cm
Correct Answer
C. 6.0 cm -
- 40.
The distance from Fp2 to T4 is 10 cm. What is the distance from Fp2 to F8?
- A.
2 cm
- B.
2.5 cm
- C.
5 cm
- D.
10 cm
Correct Answer
C. 5 cm -
- 41.
Which electrode site is located half the distance between Fp2 and C4?
- A.
P4
- B.
O2
- C.
T4
- D.
F4
Correct Answer
D. F4 -
- 42.
The circumference of the patient's head is 50 cm. What is the distance from T3 to Oz?
- A.
2.5 cm
- B.
5 cm
- C.
10 cm
- D.
12.5 cm
Correct Answer
D. 12.5 cm -
- 43.
Which electrode site is half the distance from T3 to T4?
- A.
Tz
- B.
Cz
- C.
T5
- D.
P4
Correct Answer
B. Cz -
- 44.
G1= 60 uV, G2= 10 uV. What is the output signal voltage?
- A.
70 uV
- B.
50 uV
- C.
-50 uV
- D.
-70 uV
Correct Answer
B. 50 uV -
- 45.
Which of these is a possible result of referencing electrodes with dissimilar metals to each other?
- A.
Galvinized skin response
- B.
Fire
- C.
Seizure
- D.
Electric Shock
Correct Answer
A. Galvinized skin response -
- 46.
Which of these is a DC channel?
- A.
C3-M2
- B.
Chin EMG
- C.
E1
- D.
Sp02
Correct Answer
D. Sp02 -
- 47.
Which of these types of wires is best for recording EEG activity?
- A.
Snap lead
- B.
Cup electrode
- C.
Motion detector
- D.
Clip lead
Correct Answer
B. Cup electrode -
- 48.
The rate at which a wave repeats itself or oscillates is called the
- A.
Frequency
- B.
Amplitude
- C.
Sensitivity
- D.
Filter
Correct Answer
A. Frequency -
- 49.
A change in sensitivity produces a change in the
- A.
Voltage of the incoming signal
- B.
Frequency of the wave
- C.
Height of the wave
- D.
Color of the wave
Correct Answer
C. Height of the wave -
- 50.
Which of these can be a disadvantage to using a gold cup?
- A.
Difficult to break
- B.
Increased cost
- C.
Low impedances
- D.
Disposable elctrodes are required
Correct Answer
B. Increased cost -
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