耳蜗电图慢波电位

采用同极双道同步记录法对比观察了豚鼠耳蜗电图慢波电位和快波电位的波形;测量了慢波电位的潜伏期、波幅和阈值;并与快波电位的阈值进行了比较。结果表明,慢波电位不但对高频声音反应好,而且对低频声音反应也很好,反应闽都在OdBnHL以下,因而弥补了快波电位对低频声音反应闽值高的缺陷,解决了耳蜗电图低频检测的难题。作者认为,慢波电位主要来源于听神经动作电位的慢成分,其次是听觉脑干诸核团的慢成分。慢波电位是反映频率和强度特性的理想指标,在科研及临床实践中应用将是很有前途的。

SLOW WAVE OF ELECTROCOCHLEOGRAM

The slow wave of electrocochleogram (SW-EcochG) in guinea pigs is reported. The waveforms of SW-EcochG and fast wave of EcochG (FW-EcochG) were contrastively observed with "the homopolar two-channel synchronous recording method". The latency, the amplitude and the threshold of SW-EcochG were measured and the threshold was compared with that of FW-EcochG. The results indicated that SW-EcochG showed good response not only to high frequency sound but also to low one and the responding thresholds were all under 0 dB nHL, therefore it remedied the defect of FW-EcochG which has high responding threshold to low frequency sound and solved the difficult problem in low frequency detection of FW-EcochG. It is considered that the source of SW-EcochG is mainly the slow components of action potential in auditory nerve and then the slow components of nuclei groups in the auditory brainstem. SW-EcochG is an ideal index reflecting the specific property of frequency and intensity of sound and will be applied widely in scientific research and clinical practice.