空气流量改变对半规管功能评价的影响

The influence of air flow rate change on functional evaluation of semicircular canals

目的:通过控制冷热试验的空气流量,计算并对比改变单耳空气流量前后的半规管轻瘫(CP)指数、优势偏向(DP)指数的变化,探讨单耳空气流量改变对冷热试验结果的影响,指导临床的诊断分析。方法:应用自身配对设计,测算每个研究对象的以下指标:双耳空气流量均为6L/min时的CP值与DP值,记为均衡组;左耳空气流量仍为6L/min但右耳空气流量为3L/min时的CP值与DP值,记为下降组。分别对2次的CP值与DP值进行配对t检验分析。结果:下降组较均衡组的CP和DP显著降低,差异具有统计学意义。结论:当被测试者一侧耳到达鼓膜的空气流量下降或相对下降时,冷热试验可能出现假阳性或假阴性结果,诊断时需要综合分析。

Objective：To calculate and compare the change of canal paresis（CP） and directional preponderance（DP） before and after changing air flow rate of testing ear,and to discuss the influence of air flow rate change of single ear on the final result of caloric test.Method：The CPs and DPs were calculated when the caloric tests were carried out with the air flow rate 6 L/min in both ears as symmetry stimulation,and with the air flow rate 6 L/min in left ear and 3 L/min in right ear as asymmetric stimulation.Paired T test was used in analysis between symmetry and asymmetric group.Result：CPs and DPs declined significant in asymmetric group,and the difference was statistically significant.Conclusion：When air flow rate declined,CP was to the same side,while DP was to opposite side.There might be false positive or negative result.