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首页> 外文期刊>The American journal of otology >Physiologic identification of eighth nerve subdivisions: direct recordings with bipolar and monopolar electrodes.
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Physiologic identification of eighth nerve subdivisions: direct recordings with bipolar and monopolar electrodes.

机译：第八神经细分的生理识别：用双极和单极电极直接记录。

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摘要

The purpose of this study was to determine stimulation and recording parameters that maximize differences in evoked responses recorded between the cochlear nerve and the surrounding tissues. Click-evoked potentials were obtained using monopolar and bipolar recording electrodes placed directly on the exposed eighth nerve of anesthetized cats. Responses were compared as stimulus intensity, electrode location, and bipolar electrode orientation and interelectrode spacing were systematically varied. Wave amplitudes increased monotonically with intensity for both monopolar and bipolar configurations, but bipolar configurations exhibited greater selectivity in differentiating cochlear from vestibular subdivisions. The optimal stimulus intensity was 70 to 80 dB peak sound pressure level (pSPL). Monopolar recordings were often confounded by activity originating at remote sites, typically the cochlear nucleus and (for recording sites on the vestibular nerve) the cochlear nerve. Bipolar response amplitudes increased with interelectrode spacing and were largest when electrodes were oriented parallel to the long axis of the nerve. Extrapolation of empirical data indicated that amplitudes of bipolar responses would be maximal at an electrode separation of 7.5 mm. Cochlear nerve conduction velocity, calculated from wave latencies at each of the two monopolar electrodes, was 11.6 +/- 1.6 m/sec.
机译：这项研究的目的是确定刺激和记录参数，以最大化耳蜗神经与周围组织之间记录的诱发反应的差异。使用直接放置在麻醉猫暴露的第八神经上的单极和双极记录电极可获得点击诱发电位。比较了刺激强度，电极位置，双极电极方向和电极间间距的变化，系统地改变了反应。对于单极和双极配置，波幅随强度单调增加，但在区分耳蜗和前庭细分时，双极配置显示出更大的选择性。最佳刺激强度为70至80 dB峰值声压级（pSPL）。单极记录常常与源自远端部位的活动（通常是耳蜗核和前庭神经上的记录部位）的耳蜗活动混淆。双极响应幅度随电极间距而增加，并且在电极平行于神经长轴定向时最大。经验数据的外推表明，双极响应的幅度在电极间距为7.5 mm时最大。由两个单极电极各自的波潜伏期计算出的耳蜗神经传导速度为11.6 +/- 1.6 m / sec。

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