= saccadic movement; RE = right eye; Lat = latency; Vel = velocity; S-VEL = slow-phase velocity of nystagmus; DP =
directional preponderance. (F-Test ANOVA--significance level p < 0.05.) Table 2.
Directional preponderance was defined as the difference between the sum of right and left beating nystagmus is greater than 30% [6].
The caloric test revealed normal
directional preponderance of 11% to the right and abnormal caloric weakness of 59% to the left.
The alternate binaural bithermal caloric test showed a 38% reduced vestibular response right and a
directional preponderance of 54% to the right.
The ABB test showed a 31% reduced vestibular response right and a 69%
directional preponderance to the right.
The ABB test elicited a reduced vestibular response left and a
directional preponderance (DP) left.
The alternate binaural bithermal caloric test yielded a normal reduced vestibular response and
directional preponderance. On closer examination of the individual responses, a relatively reduced warm response on the right was noted.
This test revealed a 100%
directional preponderance to the right and no significant reduced vestibular response.
The alternate binaural bithermal caloric test elicited a 0% reduced vestibular response and a 0%
directional preponderance. The simultaneous binaural bithermal stimulus elicited a type 4 response, with a marked left-beating nystagmus during simultaneous cool stimulus.
The alternate binaural bithermal (ABB) caloric test revealed a 25% reduced vestibular response (RVR) right and a 6% right
directional preponderance (DP).
The alternate binaural bithermal caloric test showed no abnormal reduced vestibular response or
directional preponderance. The simultaneous binaural bithermal test elicited a type 3 response with a left-beating nystagmus on both cool and warm stimuli.
The alternate binaural bithermal stimulus identified a 43% reduced vestibular response (RVR) left and a 31%
directional preponderance right after correction for the preexisting nystagmus.