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Cochlear Nerve Monitoring During Cerebellopontine Angle Operations

Published online by Cambridge University Press:  18 September 2015

D.W. Rowed ,
J.M. Nedzelski ,
M.Z. Cashman ,
S. Stanton  and
R.V. Harrison
D.W. Rowed*
Affiliation:
Division of Neurosurgery and Department of Otolaryngology, Sunnybrook Medical Centre, University of Toronto
J.M. Nedzelski
Affiliation:
Division of Neurosurgery and Department of Otolaryngology, Sunnybrook Medical Centre, University of Toronto
M.Z. Cashman
Affiliation:
Division of Neurosurgery and Department of Otolaryngology, Sunnybrook Medical Centre, University of Toronto
S. Stanton
Affiliation:
Division of Neurosurgery and Department of Otolaryngology, Sunnybrook Medical Centre, University of Toronto
R.V. Harrison
Affiliation:
Division of Neurosurgery and Department of Otolaryngology, Sunnybrook Medical Centre, University of Toronto
*
Division of Neurosurgery, Rm. A1017, Sunnybrook Medical Centre, 2075 Bayview Ave., Toronto, Ontario, Canada M4N 3M5
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Abstract:

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The authors present their experience with intraoperative monitoring of cochlear nerve action potentials (AP) in 30 adult patients. Operative procedures were acoustic neuroma excision with attempted hearing preservation and selective vestibular neurectomy in patients with incapacitating Meniere's disease and serviceable hearing (SRT<50 db, discrimination >60%). Loss of AP is detected rapidly and has been demonstrated after manipulation of the cochlear nerve and after coagulation of small arteries on the tumour capsule. Presence of an AP at the end of the procedure usually correlates with postoperative preservation of hearing. AP monitoring appears to be a reliable means of detecting potentially reversible changes in cochlear nerve function intraoperatively.

Type
Special Supplement — Neurosurgical Symposium
Information
Canadian Journal of Neurological Sciences , Volume 15 , Issue 1 , February 1988 , pp. 68 - 72
Copyright
Copyright © Canadian Neurological Sciences Federation 1988

References

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