Interacoustics Virtual SVV, Instructions For Use Manual, Page: 81 / 436

Virtual SVV™ Instructions for Use – US Page 29
5.4.7 Swapping measurement sequences
After each individual measurement the operator has the choice to remain with the current measurement
position or to switch to another. It is, however, recommended to perform 3 to 5 measurements at each
postion.
5.4.8 Static tilt – step procedure
The following is a shortform procedure for the static tilt test mode:
1. Instruct the patient on the examination procedure and provide a hands-on explanation of the
operation of the virtual reality goggle and handheld remote.
2. Mount the virtual reality goggle on the patient’s head and check for fit and comfort. Secure the
handheld remote with the safety loop and give the patient the handheld remote.
3. Select the first desired tilt position and secure the patient accordingly. Check for correct orientation
on the basis of the tilt indicator, the green tolerance range and the green dial center.
4. Start the first measurement by clicking on the Start button.
5. Allow the patient to set the luminous line to his/her subjective vertical and to confirm the setting.
Monitor the patient’s activity with the aid of the software application device displays.
6. Repeat the measurement procedure for the current tilt position 3 to 5 times. The use of the serial
measurement function is recommended.
7. Secure the patient in the next tilt position and perform the 3 to 5 measurements in this position.
Repeat this procedure in all required tilt positions.
8. Remove the virtual reality goggle and handheld remote from the patient. Be aware that the patient
may be disorientated for the next few minutes.
9. Store the recorded data and the resulting test report document.
During the examination the patient has been in total darkness for several minutes. After removing the
virtual reality goggle be aware that the ambient room light may be disturbing to the patient. Allow a few
minutes for the patient to readjust to the lighting in the room.
Testing with unilateral centrifugation
The unilateral centrifugation test protocol requires a motor-driven rotary chair fitted with a lateral shift
mechanism to shift the chair 3.5-4.0 cm off center in both directions. In order to generate an adequate
unilateral centrifugation stimulus, a contant angular velocity of at least 240
⁰
/second is required. For a
complete desription of the unilateral centrifugation test procedure, please refer to the Virtual SVV™
Additional Information .
Discarding data
When the test trials are completed the stored measurement data can be erased by marking the
measurement entry in the table and activating the delete icon on the lower right side of the data table.
This erase function can be used throughout the examination if for any reason a measurement needs to be
discarded.
Figure 5-11 Delete icon