Artifact Recognition & Correction - Polysomnography

12 Questions | Total Attempts: 794

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Artifact Recognition & Correction - Polysomnography

Practice artifact recognition & correction Quiz for Polysomnography


Questions and Answers
  • 1. 
    The technician observes muscle artifact in a single EEG channel that shares a common reference with other channels. The appropriate response is:
    • A. 

      Re-reference the channel showing the artifact to a back-up reference electrode

    • B. 

      Re-reference the channel showing artifact by changing the input signal derivation to a back-up exploring electrode

    • C. 

      Eliminate the artifact by double-referencing the input signal derivation

    • D. 

      Eliminate the artifact by reducing the high frequency filter to 15Hz

  • 2. 
    The preferred method of correcting undesirable artifacts during the recording process is to:
    • A. 

      Manipulation of low and high filters

    • B. 

      Applying 60Hz notch filters to the artifact channels

    • C. 

      Changing the input signal derivations

    • D. 

      Temporarily manipulating amplifier sensitivity or gain on the channels by the artifact

  • 3. 
    If 60Hz artifact is observed in one of the channels during the bio-cals process, the appropriate action should be:
    • A. 

      Re-evaluate the problem after the patient goes to sleep

    • B. 

      Re-reference to a back-up electrode, then initiate the study

    • C. 

      Use a 60Hz notch filter to eliminate the artifact

    • D. 

      Find the problem source and correct it before beginning the study

  • 4. 
    What factors come into play when deciding to enter the patients room to correct artifacts?
    • A. 

      Importance of electrode channel in scoring

    • B. 

      Ease at which patient falls asleep

    • C. 

      Skill at fixing problem without waking patient

    • D. 

      All of the above

  • 5. 
    Double-referencing (A1+A2) may be useful for?
    • A. 

      Reducing 60Hz artifact in EOGs

    • B. 

      Reducing low frequency artifact in EEG channels

    • C. 

      Reduce EKG artifact in EEG and EOG Channels

    • D. 

      All of the above

  • 6. 
    The chief way of excluding undesirable interfacing signals in polysomnography is accomplished by?
    • A. 

      Using the filters

    • B. 

      Use of the sensitivity or gain control

    • C. 

      60Hz filter application

    • D. 

      Passing input signals through differential amplifiers

  • 7. 
    Which of the following conditions are most likely to cause electrode-popping artifact?
    • A. 

      Pressure against the electrode

    • B. 

      Electrode loosing contact with scalp surface

    • C. 

      Poor ground connection

    • D. 

      Both A and C

  • 8. 
    Which of the following artifacts presents as a high frequency artifact?
    • A. 

      Muscle

    • B. 

      Respiratory

    • C. 

      Sweat

    • D. 

      Pen blocking

  • 9. 
    If the size of the prepared electrode site is too large, what can occur?
    • A. 

      Signal contamination or bridging

    • B. 

      Automatic common mode rejection

    • C. 

      Outside signal interference

    • D. 

      Excessive conductive gel on the patient

  • 10. 
    All of the following are physiologic artifacts except?
    • A. 

      Muscle

    • B. 

      Popping

    • C. 

      Respiratory

    • D. 

      Cardio-ballistic

  • 11. 
    What is one of the contributing causes of EKG artifact in arm or leg leads?
    • A. 

      Equal voltages for equal EKG conduction

    • B. 

      Increased conduction due to arms at heart level

    • C. 

      Voltages differences resulting from increased electrode distances

    • D. 

      None of the above

  • 12. 
    What is the first step in differentiating high frequency artifact caused from muscle vs. a poor electrode connection?
    • A. 

      Impedance check

    • B. 

      Reducing high filter

    • C. 

      Recalibrate channel

    • D. 

      Signal average reference electrodes to the channel in question