Objective:To establish the normal values of subjective visual vertical (SVV) in different head deflection angles and analyze its test and retest reliability, in order to provide a reference for the clinical application of SVV in the evaluation of vestibular disorders. Methods:Thirty-one healthy young people were selected to wear VR glasses, and the SVV data were tested in five different head-tilt, namely, 0° in the upright head position, 45°in the left head position, 45° in the right head position, 90° in the left head position, and 90° in the right head position, and were re-tested 2 weeks later. Results:①The mean values of SVV at 5 different head-tilt angles of 0°, left 45°, right 45°, left 90°, and right 90° were -0.07±1.71, 4.30±5.39, -6.51±5.58, -3.76±7.42, and 0.40±8.02, respectively, The 95% confidence limits of SVV at 0°, left 45°, right 45°, left 90°, right 90°, and right 90° were (-3.42, 3.28), (-6.26, 14.86), (-17.45, 4.43), (-18.30, 10.78), and(-15.32, 16.12), respectively; ②The absolute values of SVV at 4 different head-tilt angles of left 45°, right 45°, left 90°, and right 90° were 5.62±3.96, 6.90±5.07, 6.82±4.70 and 6.48±4.68, respectively. The 95% confidence limits of SVV at left 45°, right 45°, left 90°, right 90°, and right 90° were(0,12.11),(0,15.21),(0,14.53)and(0,14.16), respectively. The asymmetry ratio is 10% for the absolute value of the 45 ° deviation and 3% for the absolute value of the 90° deviation; ③Intra-class correlation coefficients(ICC) for 0°, left 45°, right 45°, left 90°, right 90°were 0.757, 0.673, 0.674, 0.815, and 0.856, respectively. Conclusion:SVV has good retest reliability and high stability, and the SVV normal value data of different head deviation angles established in the present study can be used as a reference for the diagnosis and evaluation of vestibular disorders.
目的:建立不同头位偏斜角度下的主观视觉垂直线(subjective visual vertical,SVV)正常值数据,并分析其复测信度,为SVV的临床应用提供参考。 方法:选取31名健康青年人,佩戴虚拟现实眼镜,分别测试在直立头位0°、左头位偏斜45°(L45°)、右头位偏斜45°(R45°)、左头位偏斜90°(L90°)、右头位偏斜90°(R90°)5个不同角度下的SVV数据,并于2周后进行复测。 结果:①0°、L45°、R45°、L90°、R90° 5个不同头位偏斜角度下的SVV平均值分别为:-0.07±1.71、4.30±5.39、-6.51±5.58、-3.76±7.42、0.40±8.02,95%CI分别为:(-3.42,3.28)、(-6.26,14.86)、(-17.45,4.43)、(-18.30,10.78)、(-15.32,16.12);②L45°、R45°、L90°、R90°4个不同头位偏斜角度下的SVV偏差绝对值分别为:5.62±3.96、6.90±5.07、6.82±4.70、6.48±4.68;95%CI分别为:(0,12.11)、(0,15.21)、(0,14.53)、(0,14.16);双侧45°偏差绝对值的不对称性比为10%;双侧90°偏差绝对值的不对称性比为3%;③0°、L45°、R45°、L90°、R90° SVV的组内相关系数分别为0.757、0.673、0.674、0.815、0.856。 结论:SVV具有良好的复测信度,临床测试稳定性高,本研究建立的不同偏斜角度下SVV正常值数据可辅助临床对前庭系统疾病进行精细化诊断和功能评估。.