Back to Search
Start Over
Preservation of the saccular nerve and of the vestibular evoked myogenic potential during vestibular schwannoma surgery.
- Source :
-
Otology & neurotology : official publication of the American Otological Society, American Neurotology Society [and] European Academy of Otology and Neurotology [Otol Neurotol] 2003 Mar; Vol. 24 (2), pp. 308-11. - Publication Year :
- 2003
-
Abstract
- Objective: The aim of the study was to present a case report demonstrating that vestibular evoked myogenic potentials originate from the saccular nerve.<br />Study Design: Retrospective case review.<br />Setting: Tertiary referral center.<br />Intervention: Vestibular evoked myogenic potentials are shown before and after operation in a patient with a surgically confirmed superior vestibular schwannoma (1.3 cm).<br />Main Outcome Measures: Preoperative and postoperative audiometry, auditory brainstem response, caloric test, vestibular evoked myogenic potentials, and magnetic resonance imaging outcomes. RESULTS On preoperative audiometry, slight sensorineural hearing loss with normal auditory brainstem response could be detected. Caloric tests showed a reduced response of the right labyrinth. Vestibular evoked myogenic potentials were normal. The tumor was removed via a combined retrosigmoid and partial labyrinthectomy approach with the removal of the posterior semicircular canal. The facial, auditory, and inferior semicircular nerves were anatomically preserved. Postoperative audiometry revealed preservation of hearing and vestibular evoked myogenic potentials; caloric responses were now absent.<br />Conclusion: The combined retrosigmoid and partial labyrinthectomy approach represents an ideal condition to study the influence of the saccular nerve on the origin of the vestibular evoked myogenic potentials. The maintenance of the vestibular evoked myogenic potential responses in our patient supports the concept that the vestibular evoked myogenic potential originates in the saccule and is transmitted in the saccular nerve.
- Subjects :
- Audiometry, Pure-Tone
Caloric Tests
Ear, Inner surgery
Evoked Potentials, Auditory, Brain Stem physiology
Female
Hearing Loss, Sensorineural diagnosis
Hearing Loss, Sensorineural etiology
Humans
Magnetic Resonance Imaging
Middle Aged
Neuroma, Acoustic complications
Neuroma, Acoustic pathology
Otologic Surgical Procedures methods
Postoperative Care
Preoperative Care
Retrospective Studies
Cranial Nerves physiology
Evoked Potentials physiology
Intraoperative Care
Muscle, Skeletal physiology
Neuroma, Acoustic surgery
Saccule and Utricle innervation
Vestibule, Labyrinth physiology
Subjects
Details
- Language :
- English
- ISSN :
- 1531-7129
- Volume :
- 24
- Issue :
- 2
- Database :
- MEDLINE
- Journal :
- Otology & neurotology : official publication of the American Otological Society, American Neurotology Society [and] European Academy of Otology and Neurotology
- Publication Type :
- Academic Journal
- Accession number :
- 12621349
- Full Text :
- https://doi.org/10.1097/00129492-200303000-00029