Electrocochleographic findings in superior canal dehiscence syndrome

Park, Joo Hyun; Lee, Sang Yeon; Song, Jae-Jin; Choi, Byung Yoon; Koo, Ja Won

doi:10.1016/j.heares.2015.02.001

Cited by 18 publications

(18 citation statements)

References 43 publications

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“…Arts et al identified that patients with SCDS consistently have elevations in the summating potential (SP) to action potential (AP) ratio, and that this abnormality corrects after surgical plugging of the affected canal (86, 87). These findings have subsequently been observed by us and others (88, 89). While the results have not yet correlated with postoperative hearing outcomes, changes such as rapid rises in the SP are often observed during surgery and likely reflect changes in inner ear biomechanics during vestibular surgery.…”

Section: Diagnosissupporting

confidence: 82%

Superior Canal Dehiscence Syndrome: Lessons from the First 20 Years

2017

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Superior semicircular canal dehiscence syndrome was first reported by Lloyd Minor and colleagues in 1998. Patients with a dehiscence in the bone overlying the superior semicircular canal experience symptoms of pressure or sound-induced vertigo, bone conduction hyperacusis, and pulsatile tinnitus. The initial series of patients were diagnosed based on common symptoms, a physical examination finding of eye movements in the plane of the superior semicircular canal when ear canal pressure or loud tones were applied to the ear, and high-resolution computed tomography imaging demonstrating a dehiscence in the bone over the superior semicircular canal. Research productivity directed at understanding better methods for diagnosing and treating this condition has substantially increased over the last two decades. We now have a sound understanding of the pathophysiology of third mobile window syndromes, higher resolution imaging protocols, and several sensitive and specific diagnostic tests. Furthermore, we have a treatment (surgical occlusion of the superior semicircular canal) that has demonstrated efficacy. This review will highlight some of the fundamental insights gained in SCDS, propose diagnostic criteria, and discuss future research directions.

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Section: Diagnosissupporting

confidence: 82%

Superior Canal Dehiscence Syndrome: Lessons from the First 20 Years

2017

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“…Although these results are interesting, some caution is required because other pathologies such as superior canal dehiscence (SCD) might explain the observed symptoms [17] . However, this is not very likely because the reported symptoms and the audiometric results observed in our patients are very different from the cochlear-vestibular SCD symptoms.…”

Section: Discussionmentioning

confidence: 94%

Ear Fullness as a Symptom of Endolymphatic Hydrops in non-Ménière’s Patient

Maheu

Alhabib²,

Landry

et al. 2017

Int Adv Otol

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OBJECTIVE: 1) To determine if unexplained ear fullness might be a symptom of endolymphatic hydrops (EH) by using Electrocochleography (ECochG) SP/AP area and amplitude ratios. 2) To assess if individuals with unexplained ear fullness without vertigo differ significantly from individuals with ear fullness due to Ménière's disease (MD). MATERIALS and METHODS:In a case-control study in our tertiary care center, we evaluated 62 ears across 49 patients, including 18 normal healthy ears across 12 control patients, 26 ears with unexplained ear fullness across 20 patients (6 had bilateral symptoms of ear fullness), and 18 ears with definite MD across 17 patients (1 bilateral disease). Outcome measures were SP/AP amplitude and area ratio, hearing threshold, and air-bone gap. RESULTS:The analysis of auditory thresholds revealed a significant group effect for air conduction [F(2,50)=49.627; p<0.001] and for bone conduction [F(2,50)=45.625; p<0.001]. We observed significant differences between MD (36.36±4.87) and control patients (19.85±2.55) (p=0.015) for amplitude ratio. Moreover, significant differences were noted between MD (5.32±1.06) and controls (1.36±0.07) (p=0.035) and between ear fullness (5.16±1.17) and controls (p=0.026) for the area ratio parameter. No significant correlation was observed between SP/AP area or amplitude ratios and air-bone gap at any of the tested frequencies. The amplitude ratio was not significantly different between the ear fullness and control groups (p=0.406). The area and amplitude ratios did not reveal significant differences between MD and ear fullness (p=1.00). CONCLUSION:EH can be present even in the absence of vertigo and when patients report unexplained ear fullness. This study, to our knowledge, is the first to possibly allow early identification of cochlear EH in patients suffering from ear fullness without vertigo.

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“…High-resolution computerised tomography (HRCT) of the temporal bone is required, preferentially performed with <0.5 mm slices proving dehiscence of the superior semicircular canal. The audiometric findings may include air-bone gap, a negative BC threshold on pure tone audiometry 10…”

Section: Introductionmentioning

confidence: 99%

“…Consistent findings on vestibular evoked myogenic potentials (VEMPs) may help to confirm the diagnosis with low Cervical Vestibular-Evoked Myogenic Potential (cVEMPs) threshold. More recently, abnormal electrocochleographic findings have been documented on SSCD 10…”

Section: Introductionmentioning

confidence: 99%

Bilateral superior semicircular canal dehiscence: bilateral conductive hearing loss with subtle vestibular symptoms

et al. 2020

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Superior semicircular canal dehiscence is caused by a bone defect on the roof of the superior semicircular canal. The estimated prevalence when unilateral varies between 0.4% and 0.7% and is still unknown when bilateral. Patients may present with audiologic and vestibular symptoms that may vary from asymptomatic to disabling. We report a case of a 72-year-old Caucasian woman presented to otolaryngology department reporting imbalance, bilateral pulsatile tinnitus, hypoacusis while being very sensitive to certain sounds. Physical examination was unremarkable, except for the Rinne test that was negative in both sides. The patient underwent an audiometry revealing a mild bilateral conductive hearing loss. A temporal bone CT scan was performed which evidenced bilateral superior semicircular canal dehiscence. Cervical vestibular evoked myogenic potentials and electrocochleography confirmed diagnosis. Although rare, superior semicircular canal dehiscence shall be considered in conductive hearing loss with vestibular symptoms.

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Electrocochleographic findings in superior canal dehiscence syndrome

Cited by 18 publications

References 43 publications

Superior Canal Dehiscence Syndrome: Lessons from the First 20 Years

Superior Canal Dehiscence Syndrome: Lessons from the First 20 Years

Ear Fullness as a Symptom of Endolymphatic Hydrops in non-Ménière’s Patient

Bilateral superior semicircular canal dehiscence: bilateral conductive hearing loss with subtle vestibular symptoms

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