Compensatory changes in static and dynamic subjective visual vertical in @entity1 following XXXX surgery.

@entity1 @entity6355 @entity717 @entity394
OBJECTIVE: Among @entity1 with @entity394 ( @entity394 ), vestibular function is nonhomogeneous, both before and after surgical removal of the @entity394 . This paper reports investigations of neural changes, especially changes in the contribution of visual input to vestibular system integration, after @entity394 surgery. METHODS: We examined 33 @entity1 who underwent @entity394 surgery via a middle fossa approach. Static and dynamic subjective visual vertical ( @entity6355 ) was measured once after surgery and compared to those measured in control subjects. SVVs were assessed using a paradigm requiring the subject to manually adjust an image of a bar to the perceived vertical alignment. SVVs were measured when the background was stationary or rotating. RESULTS: In almost all @entity1 , static @entity6355 deviated toward the operated side. In @entity394 subjects, the mean static @entity6355 was 1.8+/-2.2 degrees; the amount of deviation in the dynamic @entity6355 toward the operated side (11.7+/-8.3 degrees ) was significantly larger than that to the intact side (8.8+/-5.5 degrees ). In @entity394 subjects, static @entity6355 was correlated with dynamic @entity6355 only in cases of bar adjustments toward the operated side (R=0.67, P<0.001), but not in cases of adjustments toward the intact, unoperated side. The @entity717 was defined as the mean value of dynamic @entity6355 for adjustments toward either side. There was only a weak correlation between the static @entity6355 and the @entity717 (R=0.31; P<0.05) in the control subjects. On the other hand, a more robust correlation between static @entity6355 and @entity717 was found (R=0.67, P<0.001) in @entity394 subjects. There was no correlation between the static @entity6355 and the deviation of dynamic @entity6355 from static @entity6355 for CCW and CW in control subjects. In contrast, there were significant correlations between static @entity6355 and deviation of dynamic @entity6355 from static @entity6355 for adjustments made toward both operated (r=0.48, P<0.001) and intact sides (r=038, P<0.05). CONCLUSION: It is assumed that the amount of deviation in static @entity6355 reflects the individual level of compensation. In addition, increased visual dependency evoked a symmetrical bias of the dynamic @entity6355 from the measures at initial @entity6355 assessment (i.e. static @entity6355 or the center of tilt). As a result, we conclude that the contribution of visual inputs had changed after surgery, while at the same time, each @entity1 used their static @entity6355 as their reference point for orientation.
