论文部分内容阅读
背景:脑干听觉诱发电位(brainstemauditoryevokedpotential,BAEP)波Ⅴ与波Ⅰ波幅的比值Ⅴ/Ⅰ具有重要的诊断价值,但波幅与声强的关系尚缺乏系统研究。目的:研究BAEP波幅与声强之间的函数关系,得出波Ⅴ与波Ⅰ波幅的比值Ⅴ/Ⅰ测定的合适给声强度范围。设计:以诊断为依据的横断面研究。地点和对象:从菏泽医学专科学校2000级,临床证实无耳疾在校学生中随机选取50人,其中男28人,女22人,平均年龄20岁,进行BAEP测试。干预:使用YJC-A型诱发电位肌电图测试仪依次选用55,75,95,100,105,110,115,120,125dB疏密交替波短声给声刺激,分别测试双耳BAEP。主要观察指标:测定各声强下波Ⅰ、波Ⅲ、波Ⅴ的波幅以及Ⅴ/Ⅰ比值和Ⅴ/Ⅲ比值,并求出相应波幅与声强关系曲线。结果:波幅-声强函数曲线表明:①波Ⅰ、波Ⅲ、波Ⅴ波幅均随声强增大而增大。②波Ⅲ、波Ⅴ曲线陡度在90dB以前较大、90dB以后较平缓;波Ⅰ陡度远大于前者,几乎呈直线上升。③波Ⅲ与波Ⅴ近于平行。④Ⅴ/Ⅰ直线下降,与波Ⅰ几乎成反变关系;Ⅴ/Ⅲ近乎平坦直线。⑤90dB前,Ⅴ/Ⅰ大于1,随声强降低,Ⅴ/Ⅰ迅速增大,远大于1;90dB后,Ⅴ/Ⅰ接近于1,且较稳定。结论:在临床评价Ⅴ/Ⅰ比值结果时,若在<100dB范围内给声刺激易出现假阴性结果,在100～120dB声强范围内选取给声强度进
BACKGROUND: The ratio Ⅴ / Ⅰ of brainstemauditoryevoked potential (BAEP) wave Ⅴ to wave Ⅰ amplitude has important diagnostic value. However, there is no systematic study on the relationship between amplitude and sound intensity. OBJECTIVE: To study the relationship between the amplitude of BAEP and the sound intensity, and to find the suitable range of sound intensity for the ratio Ⅴ / Ⅰ of the amplitude of wave Ⅴ and wave Ⅰ. Design: A cross-sectional study based on diagnosis. Location and object: Heze Medical College from 2000, clinically proven earless disease randomly selected in the school students 50 people, including 28 males and 22 females, mean age 20 years, the BAEP test. Intervention: the use of YJC-A-type evoked potentials EMG tester followed by selection of 55,75,95,100,105,110,115,120,125dB sparse alternating short-wave sound to stimulate the ears were tested BAEP. MAIN OUTCOME MEASURES: The amplitude of wave Ⅰ, wave Ⅲ, wave Ⅴ and the ratio of Ⅴ / Ⅰ and Ⅴ / Ⅲ were measured under different sound intensities, and the corresponding curves of amplitude and sound intensity were obtained. Results: The curves of amplitude and sound intensity showed that: ① The wave Ⅰ, wave Ⅲ and wave Ⅴ amplitudes increased with the increase of sound intensity. ② The wave steepness of wave Ⅲ and wave Ⅴ curves were larger before 90 dB and smoother after 90 dB. The steepness of wave Ⅰ was much larger than the former and almost straight up. ③ wave Ⅲ and wave Ⅴ nearly parallel. ④ V / Ⅰ straight-line decline, and wave Ⅰ almost inverse relationship; Ⅴ / Ⅲ almost flat straight line. ⑤ 90dB, Ⅴ / Ⅰ greater than 1, with the sound intensity decreased, V / Ⅰ rapidly increased, far greater than 1; 90dB, Ⅴ / Ⅰ close to 1, and more stable. Conclusion: In the clinical evaluation of the results of Ⅴ / Ⅰ ratio, if false negative results are easily found in the range of <100dB within the range of 100 ~ 120dB, the sound intensity is selected