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  • Title: Intra-operative electrocochleography to monitor cochlear potentials during acoustic neuroma excision.
    Author: Sabin HI, Bentivoglio P, Symon L, Cheesman AD, Prasher D, Momma F.
    Journal: Acta Neurochir (Wien); 1987; 85(3-4):110-6. PubMed ID: 3591472.
    Abstract:
    Intra-operative electrocochleography (ECochG) was used in an attempt to monitor the action potential of the cochlear nerve during acoustic neuroma surgery in 14 patients with useful pre-operative hearing. Five patients had ECochG potentials preserved and yet only three could hear when tested audiometrically later. Of those losing the potentials intra-operatively all were subsequently deaf and the pattern of waveform loss allowed determination of the probable cause of hearing loss. Complete excision of the tumour was achieved in each case regardless of the ultimate effect on the AP as it was not felt justified to risk subsequent recurrence. In common with other studies one of the best prognostic factors for these preservation of hearing was found to be the size of the tumour.
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