Long-term Evolution of Subjective Visual Vertical after Vestibular Neurectomy and Labyrinthectomy

Subjective visual vertical (SVV) tilt, observed after vestibular neurectomy and labyrinthectomy, is considered to be due to the deafferentation of the otolithic organs. The aim of this study was to determine the long-term evolution of the SVV up to 4 years after surgery. Between 1993 and 1998 the SV...

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Bibliographic Details
Published in:Acta oto-laryngologica 2000, Vol.120 (5), p.620-622
Main Author: Vibert, D.
Format: Article
Language:English
Subjects:
Adult
Aged
Audiometry, Pure-Tone
Biological and medical sciences
Ear, auditive nerve, cochleovestibular tract, facial nerve: diseases, semeiology
Ear, Inner - surgery
Evoked Potentials, Auditory, Brain Stem
Female
Follow-Up Studies
Head and neck surgery. Maxillofacial surgery. Dental surgery. Orthodontics
Humans
Male
Medical sciences
Meniere Disease - diagnosis
Meniere Disease - surgery
Middle Aged
Non tumoral diseases
Otologic Surgical Procedures - methods
Otorhinolaryngology. Stomatology
Postoperative Period
Surgery (general aspects). Transplantations, organ and tissue grafts. Graft diseases
Surgery of the ear, the auditive nerve and the facial nerve
Time Factors
Vestibule, Labyrinth - surgery
Visual Perception - physiology
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Summary:Subjective visual vertical (SVV) tilt, observed after vestibular neurectomy and labyrinthectomy, is considered to be due to the deafferentation of the otolithic organs. The aim of this study was to determine the long-term evolution of the SVV up to 4 years after surgery. Between 1993 and 1998 the SVV was measured in 35 patients (18 men, 17 women) aged from 21 to 71 years (mean 36 years). Vestibular neurectomy was performed in 30 patients and labyrinthectomy in 6. SVV was measured with a binocular test (vertical frame) and a monocular test (Maddox rod). Immediately after operation, the SVV showed a 10-30 degrees tilt toward the operated ear with the vertical frame (normal 0 +/- 2 degrees) and a 5-22 degrees tilt with the Maddox rod (normal 0 +/- 4 degrees). After labyrinthectomy, SVV returned to normal values after 1 year in all patients. SVV also returned to normal within 1 year after vestibular neurectomy in 20 patients; in the other 10 patients SVV was still slightly tilted 1-4 years after neurectomy: > 2 degrees with the vertical frame and > 4 degrees with the Maddox rod, particularly on the eye ipsilateral to the operated ear. Some of these 10 patients also had persisting disequilibrium.
ISSN:0001-6489
1651-2251
DOI:10.1080/000164800750000432