Artifact Recognition & Correction - Polysomnography
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Practice artifact recognition & correction Quiz for Polysomnography
- 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
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