Polysomnography Board Prep
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- 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
- 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
- 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
- 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
- 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
- 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
- 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
- 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
- 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
- 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
- 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
- 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
- 13.Amplitude is a measure of
- A.
Impedance
- B.
Voltage
- C.
Current
- D.
Resistance
- 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
- 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
- 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
- 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
- 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
- 19.
- 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
- 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
- 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
- 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
- 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
- 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
- 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
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