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7例第八对颅神经瘤,肿瘤大小为0.8～2.5cm,患者于手术前、后均进行了ABR测试,以估计手术后听力保留程度。测试声为85～90dB nHL的稀疏短声。刺激频率为10～11次/秒,放大器滤波为100至150Hz高通和3 000Hz低通,叠加2 000次,每耳重复测2次。引导电极置于头顶部或前额上发际,参考电极置于同侧乳突或耳道内。对侧乳突或耳道电极接地。记录波Ⅰ、Ⅲ和Ⅴ。计算波Ⅰ—Ⅲ,Ⅲ—Ⅴ和Ⅰ
Seven cases of the eighth cranial neuroma, the tumor size of 0.8 ~ 2.5cm, patients before and after surgery were ABR test to assess the degree of hearing retention after surgery. Test sound is 85 ~ 90dB nHL sparse short sound. Stimulation frequency of 10 to 11 times / second, the amplifier filter for the high pass and the low frequency of 100-150 Hz 3 000 Hz, superimposed 2 000 times, repeat test 2 times each ear. The lead electrode is placed on the top of the head or on the forehead and the reference electrode is placed on the ipsilateral papilla or ear canal. Contralateral mastoid or ear canal electrode grounded. Recorded wave Ⅰ, Ⅲ and Ⅴ. Waves I-III, III-V and I are calculated