Akin Faith W, Murnane Owen D, Pearson Amber, Byrd Stephanie, Kelly Kip J
James H. Quillen VA Medical Center, Mountain Home, TN, USA.
J Am Acad Audiol. 2011 Jul-Aug;22(7):460-8. doi: 10.3766/jaaa.22.7.6.
The otoliths act as gravito-inertial force sensors and contribute to the perception of spatial orientation. The perception of gravitational vertical can be assessed by asking a subject to adjust a light bar to the vertical. Prior to clinical use of the SVV (subjective visual vertical) test, normative data and test-retest reliability must be established.
To obtain normative data and d etermine the test-retest reliability for the SVV test performed in static and dynamic test conditions.
A descriptive design was used to obtain normative data.
Twenty-four young adults with no history of neurological disease, middle-ear pathology, open or closed head injury, cervical injury, or audiovestibular disorder participated in the study.
The SVV angle was measured in the static position and in three dynamic conditions: (1) on-axis clockwise (CW) rotation, (2) off-axis CW rotation of right ear, and (3) off-axis CW rotation of left ear.
In young healthy individuals, the SVV was <2° for static and on-axis rotation, and shifted up to 11° during unilateral centrifugation. Test-retest reliability of the SVV was good for all test conditions.
The normative data obtained in this study may be useful in identifying patients with chronic utricular dysfunction. We recommend the use of difference angles (on-axis SVV - off-axis SVV) to remove baseline bias and decrease the variability of the SVV angles for the off-axis conditions.
耳石作为重力惯性力传感器，有助于空间定向感知。重力垂直方向的感知可通过让受试者将一根光棒调整至垂直方向来评估。在主观视觉垂直（SVV）测试用于临床之前，必须确立规范数据和重测信度。
获取规范数据，并确定在静态和动态测试条件下进行的SVV测试的重测信度。
采用描述性设计获取规范数据。
24名无神经疾病、中耳病变、开放性或闭合性头部损伤、颈部损伤或听觉前庭障碍病史的年轻成年人参与了该研究。
在静态位置以及三种动态条件下测量SVV角度：（1）轴向顺时针（CW）旋转，（2）右耳离轴CW旋转，以及（3）左耳离轴CW旋转。
在年轻健康个体中，静态和轴向旋转时SVV<2°，单侧离心过程中SVV最多偏移11°。SVV在所有测试条件下的重测信度良好。
本研究中获得的规范数据可能有助于识别患有慢性椭圆囊功能障碍的患者。我们建议使用差值角度（轴向SVV - 离轴SVV）来消除基线偏差，并降低离轴条件下SVV角度的变异性。
