Objective: The aim of this study was to design and perform "Tap-hammer"system that can be used to elicit vestibular evoked myogenic potentials (VEMP) in normal adults and to report the preliminary results of this system. Methods: A triggered Tap-hammer was designed, made and connected with an electric recording system, to form as a system for Tap-VEMP recording. Twenty healthy adult volunteers (7 males and 13 females, aged 20 to 37 years, 40 ears in total) were recruited for air-conducted sound VEMP (ACS-VEMP) and Tap-VEMP examinations. Waveforms and parameters of both VEMPs were recorded and analyzed. SPSS 22.0 software was used for statistical analysis. Results: The response rates of ACS-, Tap-ocular VEMP (oVEMP) and ACS-, Tap-cervical VEMP (cVEMP) were both 100% (40/40). The mean±SD n1 latency, p1 latency, n1-p1 interval, amplitude, and asymmetry ratio (AR%) of Tap-oVEMP were (9.80±2.51)ms, (13.90±3.26)ms, (4.09±1.43)ms, (16.43±9.61)μV, (22.68±17.35)% respectively. The mean±SD p1 latency, n1 latency, p1-n1 interval, amplitude, and asymmetry ratio (AR%) of Tap-cVEMP were (13.26±2.07)ms, (21.84±2.89)ms, (8.58±2.10)ms, (457.65±274.94)μV, (20.42±13.46)% respectively. Both n1 latency and p1 latency of Tap-VEMPs were shorter than those in ACS-VEMPs (P<0.05). No statistical difference could be found between the two stimulation methods in the parameters of n1-p1 interval, amplitude, and asymmetry ratio(P>0.05). Conclusion: The Tap-hammer system can elicit VEMP responses in healthy young people. This system can be used as an alternative stimulation method for bone conduction VEMP.
目的： 研发可用于前庭诱发肌源性电位（vestibular-evoked myogenic potentials，VEMP）检测的Tap-hammer激发系统，并报告Tap-hammer刺激在VEMP检测中的初步应用结果。 方法： 研发携带惯性触发开关的Tap-hammer激发系统，并将其与肌电诱发电位记录仪耦合，使之能够用于骨导振动刺激诱发的VEMP检测。对20名（男7例、女13例，年龄20~37岁，共40耳）健康志愿者进行气导声刺激（air-conducted sound，ACS）诱发的VEMP（ACS-VEMP）和Tap-hammer诱发的VEMP（Tap-VEMP）检测，记录和分析Tap-VEMP的波形特点及其参数，并应用SPSS 22.0进行统计分析。 结果： 20名健康志愿者ACS-VEMP和Tap-VEMP的引出率均为100%（40/40）。Tap-hammer诱发的眼肌前庭诱发肌源性电位（Tap-oVEMP）的n1潜伏期、p1潜伏期、n1-p1波间期、振幅以及耳间不对称比分别为（9.80±2.51）ms、（13.90±3.26）ms、（4.09±1.43）ms、（16.43±9.61）μV及（22.68±17.35）%；Tap-hammer诱发的颈肌前庭诱发肌源性电位（Tap-cVEMP）的p1潜伏期、n1潜伏期、p1-n1波间期、振幅及耳间不对称比分别为（13.26±2.07）ms、（21.84±2.89）ms、（8.58±2.10）ms、（457.65±274.94）μV及（20.42±13.46）%。与ACS-VEMP检测结果相比，Tap-VEMP的n1、p1潜伏期较短（P值均<0.05），而两种刺激方式的波间期、振幅和耳间不对称比，差异均无统计学意义（P值均>0.05）。 结论： Tap-hammer激发系统可以在健康青年人中诱发出VEMP反应，该系统可以作为骨导VEMP检测的备选刺激方式。.
Keywords: Bone conduction; Vestibular evoked myogenic potentials.