听觉脑干反应（ABR）.ppt

* * * * * * * * * * * * * Combining all four qualities provides the unsurpassed test speed (typically less than 20 seconds) and the extreme safety against Passing deaf ears (Sensitivity of 99.996%). * - Run a ABRIS demonstration Resulting Estimated Audiogram 需要ABR或ASSR测试的患者 - NICU (早产儿) - 新生儿筛查 - 儿童无法配合测听者 - 无法配合纯音测听者 - 需要出具客观听力测试报告者 - 进展性听力损失– 药物或老年性聋 - 听觉系统疾病 - 临床用药监控 - 耳毒性药物应用指导 Auditory Middle Latency Response Anatomy involved is reticular formation in addition to the lateral lemniscus * The recordings acquired will contain certain peaks and valleys. In an MLR recording, the peaks are given by a positive potential difference, which are labeled with a P; the valleys are given by negative potential difference, which are labeled with an N. The first peak, Pa, is commonly found at 25 to 30ms from stimulation. The next peak, Pb, may be found 25 to 30 ms after the first. * ABRIS 测试原理 用30、35或40dB nHL的短声诱发 电极放置同ABR 采用快速稳态筛查运算方法 敏感性高达99.996% 问题？ THANK YOU!!! * * * * * * * * How are the ABR signals generated? : Sound waves are transmitted into fluid movements in the inner ear, where it excite haircells. When the haircells are being stimulated by soundstimuli, they generate a neural response which is encoded informations about the stimuli. This information’s are send towards the brain via the VIII cranial nerve (n.vestibucochlearis!) START animation’s. Wave generator Wave I - Auditory Nerve Wave II – Intracranial Auditory Nerve, Cochlear Nucleus Wave III - Contralateral Superior Olive Wave IV/V Complex- Bilateral Lateral Lemnisci Wave VI – Contralateral Inferior Colliculus No = Na = Po =…. Og de sidstem LLR potentialer, find p? nettet. * * Vertex Forehead (aktive) Mastoide Reference Ground, cheek or just above the eyebrow, where it is easier to rub the skin. Preamplifier, differential mode (amplify the difference of the potential measured form Active and reference. * * * * * * * * * * * * Hearing Threshold examination. 0-15 msec of interest.