Involvement of the Internal Auditory Canal in Subjects With Cochlear Otosclerosis

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Abstract

To investigate the effects of cavitating lesions involving the internal auditory canal (IAC) in subjects with cochlear otosclerosis with regard to poststapedotomy hearing outcome.

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Sound- and/or pressure-induced vertigo due to bone dehiscence of the superior semicircular canal.

J Zinreich, D Zee, Sharon D Solomon … (1998)

To present symptoms, patterns of nystagmus, and computed tomographic scan identification of patients with sound- and/or pressure-induced vertigo due to dehiscence of bone overlying the superior semicircular canal. To describe anatomical findings and outcome in 2 patients undergoing plugging of the superior semicircular canal for treatment of these symptoms. Prospective study of a case series in a tertiary care referral center. Eight patients with vertigo, oscillopsia, and/or disequilibrium related to sound, changes in middle ear pressure, and/or changes in intracranial pressure were identified in a 2-year period. Seven of these patients also had vertical-torsional eye movements induced by these sound and/or pressure stimuli. The direction of the evoked eye movements could be explained by excitation or inhibition of the superior semicircular canal in the affected ear. Computed tomographic scans of the temporal bones identified dehiscence of bone overlying the affected superior semicircular canal in each case. Disabling disequilibrium in 2 patients prompted plugging of the dehiscent superior canal through a middle cranial fossa approach. Symptoms were improved in each case. One patient developed recurrent symptoms requiring an additional plugging procedure and developed sensorineural hearing loss several days after this second procedure. We have identified patients with a syndrome of vestibular symptoms induced by sound in an ear or by changes in middle ear or intracranial pressure. These patients can also experience chronic disequilibrium. Eye movements in the plane parallel to that of the superior semicircular canal were evoked by stimuli that have the potential to cause ampullofugal or ampullopetal deflection of this canal's cupula in the presence of a dehiscence of bone overlying the canal. The existence of such deshiscences was confirmed with computed tomographic scans of the temporal bones. Surgical plugging of the affected canal may be beneficial in patients with disabling symptoms.

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A new standardized format for reporting hearing outcome in clinical trials.

Richard Gurgel, Robert K. Jackler, Robert A. Dobie … (2012)

The lack of an adequate standardized method for reporting level of hearing function in clinical trials has hampered the ability of investigators to draw comparisons across studies. Variability in data reported and presentation format inhibits meta-analysis and makes it impossible to accumulate the large patient cohorts needed for statistically significant inference. Recognizing its importance to the field and after a widely inclusive discussion, the Hearing Committee of the American Academy of Otolaryngology-Head and Neck Surgery endorsed a new minimal standard for reporting hearing results in clinical trials, consisting of a scattergram relating average pure-tone threshold to word recognition score. Investigators remain free to publish their hearing data in any format they believe is interesting and informative, as long as they include the minimal data set to facilitate interstudy comparability.

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Conductive hearing loss caused by third-window lesions of the inner ear.

Saumil N Merchant, John J Rosowski (2008)

Various authors have described conductive hearing loss (CHL), defined as an air-bone gap on audiometry, in patients without obvious middle ear pathologic findings. Recent investigations have suggested that many of these cases are due to disorders of the inner ear, resulting in pathologic third windows.

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Author and article information

Journal

Title: Otology & Neurotology

Abbreviated Title: Otology & Neurotology

Publisher: Ovid Technologies (Wolters Kluwer Health)

ISSN (Print): 1531-7129

Publication date Created: 2019

Publication date (Print): March 2019

Volume: 40

Issue: 3

Pages: e186-e190

Article

DOI: 10.1097/MAO.0000000000002144

PubMed ID: 30741893

SO-VID: d2e71331-3ffb-41fd-a57d-f6b04fe6f442

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Involvement of the Internal Auditory Canal in Subjects With Cochlear Otosclerosis : A Less Acknowledged Third Window That Affects Surgical Outcome

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Most cited references 27

Sound- and/or pressure-induced vertigo due to bone dehiscence of the superior semicircular canal.

A new standardized format for reporting hearing outcome in clinical trials.

Conductive hearing loss caused by third-window lesions of the inner ear.

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