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Principles of VNG Analysis

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1.  What aspect below is NOT one of the basic measures of nystagmus? intensity of nystagmus latency of nystagmus beat frequency duration of nystagmus

2.  Why should you check the distance of the patient from the light bar? because the position of the patient in relation to the light bar affects the measured eye movements because you can use the default calibration for all patients because it will keep the goggles in the proper position because you want to ensure that the patient has an easy time seeing the stimulus without eyeglasses

3.  What is the difference between "locate peak" and "set peak" in the Chartr system? click on set peak to have the computer search for the peak; click on locate peak to manually set the peak set peak uses an average of beats to determine the peak of the response and locate peak uses one beat to determine the peak of the response click on set peak to manually set the peak; click on locate peak to have the computer search for the peak set peak allows the user to type in an SPV value; locate peak instructs the computer to search for the peak

4.  How do you verify that the computer has appropriately measured the amplitude of nystagmus beats? View the analysis Use tools, like interpretation assistant to confirm measurements Print all results Spot-check measurements of nystagmus amplitude

5.  Which of the following was NOT discussed as an important element of setting up for successful data collection? Entering patient data Goggle placement Video adjust Calibration

6.  All of the following will lead to rejected data points in tracking and saccades, except: The patient is anticipating the target movement The patient has an oculomotor deficit The patient is moving his/her head as well as his/her eyes The patient is not attending to the task

7.  If the criterion for evaluating OPK results is that the nystagmus SPV should be at least 75% of the target velocity for each direction, then: When the target is 20 deg/sec, the patient's nystagmus should be at least 10 deg/sec in each direction When the target is 40 deg/sec, the patient's nystagmus should be at least 30 deg/sec in each direction When the target is 20 deg/sec, the patient's nystagmus should be at least 12 deg/sec in each direction When the target is 40 deg/sec, the patient's nystagmus should be at least 35 deg/sec in each direction

8.  How long is the ICS Chartr 200 analysis window for gaze, positional, and caloric responses? infinitely long 140 seconds from the Begin point 140 seconds 140 seconds prior to the End point

9.  What are recommended cutoff values for nystagmus found in static position testing with vision denied? 6 deg/sec for vertical nystagmus and 7 deg/sec for horizontal nystagmus Horizontal nystagmus found persistently in four or more head positions Horizontal or vertical nystagmus greater than 1-2 deg/sec None of the above

10.  What is the purpose of the Interpretation Assistant in Chartr 200? To validate and analyze the results of positional or caloric responses To verify appropriate calibration of positional or caloric responses To determine the site of lesion for positional or caloric responses To make appropriate referrals based on positional or caloric responses