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# Final review

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• P. 26 in RPSGT Study Guide 5 Th edition
• 11/28/11
• 11/28/11
• 11/28/11
• 11/28/11
• Here the numbers 0.3, 1.0 and 5 represent the Hz of the LFF 11/28/11
• ### Transcript

• 1. PSG 103 Michelle Sartelle, RPSGT, RRT Review for Final - PSG 101
• 2. Machine Calibrations
• What is the purpose of the machine calibrations and what does it tell us?
• See next slide for an example of what a machine cal looks
• like, this is from page 26 in RPSGT Study Guide 5 th edition
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• 3. J Sargeant Reynolds Community College
• 4. Machine Calibration
• Must be performed before and after study
• A standard -50µV is applied to each AC channel
• This verifies correct polarity, amplitude and time constant
• AND filter, sensitivity settings.
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• 5. MSLT
• While performing a MSLT, the patient fell asleep at 11:30 am, what time would you end the nap?
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• 6. Procedure
• Sleep Onset in the Clinical MSLT:
• the first epoch of any stage of sleep
• Terminate and document “Lights On” after:
• - 20 minutes if no sleep occurs or
• - 15 minutes after the first epoch of sleep
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• 7. So the patient fell asleep at 11:30 am , what is 11:30 plus 15 minutes?
• For questions like this you need to remember when you end a MSLT and then add to get the correct answer.
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• 8. Respiratory effort vs flow
• Effort is measured with the chest and abdomen belts, they should be RIP (Respiratory Inductance Plethysmography) belts
• This tells us if the patient is making the effort to breathe
• Flow is measured with the thermistor and p flow cannula
• This tells us if there is air moving in and out of the mouth and/or nose
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• 9. Eye Movement
• The E2 electrode is placed up from the outer canthus of the right eye, and the E1 electrode is placed down from the outer canthus of the left eye. If the E2 channel is channel 7 on the montage and E1 is channel 8 on the montage, what will the waveforms do when the patient looks down?
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• 10. Let’s draw this question out! J Sargeant Reynolds Community College R-E2 L-E1 You can see when you draw it out that E2 is going to pick up a negative charge ( or upward deflection) and E1 is going to pick up a positive charge ( or downward deflection). So the question says that E2 is channel 7 and E1 is channel 8 . Draw this out also E2 channel 7 E1 channel 8
• 11. So the answer is………..?
• move away from each other
• both move up
• both move down
• move toward each other
J Sargeant Reynolds Community College Remember eye movements should not be in phase!
• 12. Artifact and it’s characteristics Let look at some of the most common types of artifact… J Sargeant Reynolds Community College
• 13. Let’s think about the characteristics of each type of artifact ?
• 60Hz artifact
• Look at the next slide for an example of 60 Hz artifact, it is a high amplitude, high frequency artifact.
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• 14. 60 Hz Artifact Going………………..Going………………..GONE Here the chin lead has fallen off J Sargeant Reynolds Community College
• 15. Let’s think about the characteristics of each type of artifact ?
• ECG artifact
• Look at the next slide for an example of ECG artifact, it can be a high amplitude artifact but does not have a frequency because it is not a sinusoidal wave. You can not count it’s cycles per second.
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• 16. ECG Artifact J Sargeant Reynolds Community College
• 17. Let’s think about the characteristics of each type of artifact ?
• Movement artifact
• Look at the next slide for an example of movement artifact, it is a high frequency artifact which can affect all channels
• You have to wait for the patient to stop moving, you cannot correct it.
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• 18. Movement Artifact
• 19. Let’s think about the characteristics of each type of artifact ?
• Sweat artifact
• Look at the next slide for an example of sweat artifact, it is a high amplitude , low frequency artifact
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• 20. Sweat Artifact
• 21. LFF Filters
• If the LFF is increased from 0.3 Hz to 1 Hz is an EEG channel, how will this affect the recording?
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• 22. Low Frequency Filter
• Designed to reduce the amplitude of frequencies at and below the selected frequency
• Low cut, high pass filters
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• 23. Filters Effect Amplitude Low Filter J Sargeant Reynolds Community College
• 24. Low Frequency Response Curve J Sargeant Reynolds Community College Look at the line where the red arrow is pointing, that represents a 1 Hz LFF, Now look at the black brackets pointing to the Hz of a theta wave. You can see the LFF of 1Hz would not affect this wave. Now look at the blue bracket pointing to the Hz of a delta wave, you can see that this would be greatly affected by the LFF of 1Hz. In fact if you look where the star is you can see that a .5 Hz wave would be decreased by half the amplitude.
• 25. So the answer is………………….?
• It will decrease the amplitude of delta waves
•
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• 26. Sensitivity
• Adjusting the sensitivity from 5µV/mm to 10µV/mm will
• reduce the pen deflection by one half
• not affect the pen deflection
• double the pen deflection
• increase the pen deflection by 5 times
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• 27. In order to answer this question correctly..
• You needed to remember the formula on the following slide.
• When I encounter these types of problems I insert numbers and work out the math.
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• 28. Basic Formulas
• Voltage = Sensitivity x Deflection
• Sensitivity = Voltage / Deflection
• Deflection = Voltage / Sensitivity
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• 29.
• I gave you the sensitivity of 5 first
• So make up some numbers
• Deflection = Voltage / 5 (Lets make the voltage 20)
• 4 = 20/ 5
• Now change the sensitivity to 10
• 2= 20/ 10
• You can see when we plug in numbers that doubling the sensitivity, halves the pen deflection
• They are inversely proportional.
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• 30. So the answer is……….
• Adjusting the sensitivity from 5µV/mm to 10µV/mm will
• reduce the pen deflection by one half
J Sargeant Reynolds Community College