Horizontal Eye Position Affects Measured Vertical VOR Gain on the Video Head Impulse Test.
Horizontal Eye Position Affects Measured Vertical VOR Gain on the Video Head Impulse Test.
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DOI：
10.3389/fneur.2015.00058
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发表时间：
2015
影响因子：
3.4
通讯作者：
Curthoys IS
中科院分区：
文献类型：
--
作者：
McGarvie LA;Martinez-Lopez M;Burgess AM;MacDougall HG;Curthoys IS
背景/假设：在视频头部脉冲测试(VHIT)中，垂直VOR增益被定义为(垂直眼速/垂直头部速度)，但垂直通道刺激的代偿性眼球运动通常具有扭转成分。为了最大限度地减少扭转对眼动测量的影响，水平凝视方向应从正前方开始指向40°，使其位于受激管平面对的平面内。假设：当凝视有系统地水平远离根管平面对齐时，测量的垂直VOR增益应该会降低。研究设计：10名健康受试者，vHIT测量左前右后管面垂直眼球运动至头部冲动，注视5个水平注视位置之一[40°(与左前右后管面对齐)，20°，0°，−20°，−40°]。方法：每个头部冲动均在LARP平面内。利用vHIT原型系统测量补偿性眼动。只有一个接线员传递了每一种冲动。结果：在所有试验中，管刺激保持不变，但测量的垂直VOR增益随着水平视角远离LARP管平面而减小。结论：vHIT测量垂直VOR增益时，水平视角应与受试者的椎管平面对齐。
Background/hypothesis: With the video head impulse test (vHIT), the vertical VOR gain is defined as (vertical eye velocity/vertical head velocity), but compensatory eye movements to vertical canal stimulation usually have a torsional component. To minimize the contribution of torsion to the eye movement measurement, the horizontal gaze direction should be directed 40° from straight ahead so it is in the plane of the stimulated canal plane pair. Hypothesis: as gaze is systematically moved horizontally away from canal plane alignment, the measured vertical VOR gain should decrease. Study design: Ten healthy subjects, with vHIT measuring vertical eye movement to head impulses in the plane of the left anterior-right posterior (LARP) canal plane, with gaze at one of five horizontal gaze positions [40°(aligned with the LARP plane), 20°, 0°, −20°, −40°]. Methods: Every head impulse was in the LARP plane. The compensatory eye movement was measured by the vHIT prototype system. The one operator delivered every impulse. Results: The canal stimulus remained identical across trials, but the measured vertical VOR gain decreased as horizontal gaze angle was shifted away from alignment with the LARP canal plane. Conclusion: In measuring vertical VOR gain with vHIT the horizontal gaze angle should be aligned with the canal plane under test.
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DOI：
10.3233/ves-2011-0421
发表时间：
2011-01-01
影响因子：
2.3
作者：
Migliaccio, Americo A.;Cremer, Phillip D.
通讯作者：
Cremer, Phillip D.
影响因子：
9.9
作者：
MacDougall, H. G.;Weber, K. P.;Curthoys, I. S.
通讯作者：
Curthoys, I. S.
影响因子：
14.5
作者：
Cremer, PD;Halmagyi, GM;Hannigan, IP
通讯作者：
Hannigan, IP
影响因子：
9.9
作者：
Cremer, PD;Minor, LB;Della Santina, CC
通讯作者：
Della Santina, CC
影响因子：
2.1
作者：
MacDougall, Hamish G.;McGarvie, Leigh A.;Weber, Konrad P.
通讯作者：
Weber, Konrad P.