Application of the Video Head Impulse Test to Detect Vertical Semicircular Canal Dysfunction
Application of the Video Head Impulse Test to Detect Vertical Semicircular Canal Dysfunction
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DOI：
10.1097/mao.0b013e31828d676d
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发表时间：
2013-08-01
影响因子：
2.1
通讯作者：
Weber, Konrad P.
中科院分区：
文献类型：
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作者：
MacDougall, Hamish G.;McGarvie, Leigh A.;Weber, Konrad P.
目的：视频头脉冲测试（vHIT）是检测半规管功能障碍的有用临床工具。然而，到目前为止，vHIT 仅限于水平半规管功能的测量。本研究的目的是确定 vHIT 是否可以检测垂直半规管功能障碍。 研究设计：通过高速视频（250 Hz 采样率）以及头部运动测量，记录水平和垂直眼球运动，以响应垂直半规管平面中突然、被动、不可预测的头部转动（头部脉冲）。头部冲动在垂直半规管的平面上对角地传递，而凝视则沿着同一平面定向。对先前巩膜搜索线圈记录显示已知前庭丧失的患者进行测试，以确定 vHIT 测试是否可以检测到前庭丧失。 结果：将单侧、双侧和个别半规管功能障碍患者的结果与健康对照受试者的结果进行比较。双侧前庭丧失的患者在任何方向上都没有代偿性缓慢眼球运动。单侧前庭丧失的患者表现出对激活受影响右耳耳道（右前、右后和右水平头脉冲）的头部脉冲的反应减弱。孤立性半规管缺失的患者对激活受影响的右后半规管的头部脉冲反应减弱。结论：vHIT 可检测垂直和水平半规管功能的外周缺陷，是测量前庭患者个体半规管功能障碍的新工具。
Objective: The video head impulse test (vHIT) is a useful clinical tool to detect semicircular canal dysfunction. However, so far, vHIT has been limited to measurement of the function of the horizontal semicircular canals. The goal of this study was to determine if vHIT can detect vertical semicircular canal dysfunction.Study Design: Horizontal and vertical eye movements were recorded in response to abrupt, passive, unpredictable head turns (head impulses) in the planes of the vertical semicircular canals by high-speed video (250-Hz sampling rate) together with measures of the head movement. Head impulses were delivered diagonally in the plane of the vertical semicircular canals, whereas gaze was directed along the same plane. Patients with known vestibular loss as shown by previous scleral search coil recording were tested to identify if the vHIT testing could detect the loss.Results: The results of patients with unilateral, bilateral, and individual semicircular canal dysfunction were compared with the results of a healthy control subject. The patient with bilateral vestibular loss had no compensatory slow eye movements in any direction. The patient with unilateral vestibular loss showed reduced response for head impulses activating the canals in their affected right ear (right anterior, right posterior, and right horizontal head impulses). The patient with isolated canal loss showed reduced response for head impulses activating the affected right posterior canal.Conclusion: vHIT detects peripheral deficits of both vertical and horizontal semicircular canal function and is a new tool for measuring dysfunction of individual semicircular canals in vestibular patients.