健康青年人平稳跟踪增益正常参考值范围研究

Study on normal reference range of smooth tracking gain for healthy young people

目的:分析正常青年人平稳跟踪试验的正常参考值。方法:应用法国Synapsys视频眼震图仪对30名健康青年志愿者进行平稳跟踪试验,水平平稳跟踪的左/右跟踪视角为30°、垂直平稳跟踪上/下的跟踪视角为20°,频率分别为0.30 Hz、0.45 Hz和0.60 Hz,以不同频率下的平稳跟踪增益为观测指标。结果:水平平稳跟踪在0.30 Hz、0.45 Hz和0.60 Hz的左/右增益分别为0.92±0.07/0.93±0.07、0.87±0.08/0.88±0.11、0.79±0.11/0.78±0.13,左/右增益的非对称分别为0.021±0.017、0.031±0.026、0.037±0.040;垂直平稳跟踪上/下增益分别为0.82±0.16/0.80±0.16、0.78±0.17/0.72±0.15、0.68±0.20/0.61±0.15,上/下增益的非对称分别为0.046±0.045、0.069±0.058、0.109±0.076。比较分析3个频率的左、右增益值配对t检验,差异均无统计学意义(P>0.05)。对不同频率上、下平稳跟踪的增益值配对t检验,频率为0.3 Hz时的差异无统计学意义(P>0.05),但0.45 Hz和0.60 Hz时的差异均有统计学意义(P<0.05)。比较同一方向不同频率的平稳跟踪增益,方差分析差异均有统计学意义(P<0.05)。结论:正常青年人平稳跟踪试验的增益值可受跟踪频率及方向影响,3个频率的左/右跟踪及0.30 Hz的上/下跟踪增益值均对称,但在0.45 Hz、0.60 Hz时,向上跟踪增益大于向下,而且在同一方向的增益值随着频率的增加而逐渐减小,临床平稳跟踪试验以0.30 Hz检测为主。

Objective:Analysis of normal reference value of smooth pursuit test for normal young people.Method:Thirty normal young volunteers were tested by Synapsys videonystagmography.The maximum horizontal tracking angle was 30°,the vertical maximum tracking angle was 20°,and the frequency was 0.30 Hz,0.45 Hz and 0.60 Hz,respectively,and the gain under different conditions is used as the observation index.Result:When the frequency is 0.3 Hz,0.45 Hz,0.60 Hz,the left and right horizontal gain is 0.92±0.07/0.93±0.07,0.87±0.08/0.88±0.11,0.79±0.11/0.78±0.13,respectively,and the asymmetry of left/right gain is 0.021±0.017,0.031±0.026,0.037±0.040;the up and down vertical gain is 0.82±0.16/0.80±0.16,0.78±0.17/0.72±0.15,0.68±0.20/0.61±0.15,and the asymmetry of the upper/lower gain is 0.046±0.045,0.069±0.058,0.109±0.076.Comparing and analyzing the paired left and right gain values of the three frequencies by paired t test,the differences were not statistically significant(P>0.05).Paired t-test of gain value for different frequency of up and down stationary tracking,the difference was not statistically significant at 0.30 Hz(P>0.05),but the gain at 0.45 Hz and 0.60 Hz has significant difference(P<0.05).Comparing the gains of different frequencies in the same direction,the differences in analysis of variance were statistically significant(P<0.05).Conclusion:The gain value of smooth pursuit test for normal young people can be affected by tracking frequency and direction.At the same frequency,the left/right tracking of 3 frequencies and the up/down tracking gain values of 0.30 Hz are symmetrical,but at 0.45 Hz and 0.6 Hz,the up tracking gain is greater than the down tracking gain,and the gain value in the same direction gradually decreases with the increase of frequency,is the clinical smooth pursuit test is mainly based on 0.30 Hz.