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Narrow Nerve

Narrow Nerve. surgical outcome diagnostic accuracy. speech awareness. limited cost effectiveness. candidacy. right ear – cochlear nerve stenosis. SCC. Normal Internal Auditory Canal. Cochlea. FN. SCC. Normal Internal Auditory Canal. Normal IAC. SVN. CN. VCN. Cochlea. VN.

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Narrow Nerve

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  1. Narrow Nerve • surgical outcome • diagnostic accuracy speech awareness limited cost effectiveness candidacy right ear – cochlear nerve stenosis

  2. SCC Normal Internal Auditory Canal Cochlea

  3. FN SCC Normal Internal Auditory Canal Normal IAC SVN CN VCN Cochlea VN IVN

  4. Stenotic IAC – Functional Nerves? Stenotic IAC FN SVN ? CN IVN

  5. 1µV 1ms 1µV 1ms Cochlear Nerve Canal Diameter Normal* Moderate Stenosis Amplitude (µV) Critical Stenosis *Propst et al 2006 Laryngoscope Time (ms)

  6. Narrow Nerve • surgical outcome • diagnostic accuracy speech awareness limited cost effectiveness 1.5 mm candidacy

  7. Current Opinion • variable outcome • less than 1.5 mm nerve – very poor performance • high rate of unwanted stimulation • possible role for ABI

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