Enlarged vestibular aqueduct: Intraoperative electrocochleography findings during cochlear implantation

Enlarged vestibular aqueduct (EVA) is the most frequent inner ear abnormality found on computed tomography in children with sensorineural hearing loss. The effects EVA abnormalities have on electrocochleography (ECochG) are unknown. Positive deflections in summation potential evoked by tone bursts w...

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Bibliographic Details
Published in:International journal of pediatric otorhinolaryngology 2020-07, Vol.134, p.110065-110065, Article 110065
Main Authors: Riggs, William J., Hiss, Meghan M., Varadarajan, Varun V., Mattingly, Jameson K., Adunka, Oliver F.
Format: Article
Language:English
Subjects:
Cochlear implants
Electrocochleography
Enlarged vestibular aqueduct
Summation potential
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Summary:Enlarged vestibular aqueduct (EVA) is the most frequent inner ear abnormality found on computed tomography in children with sensorineural hearing loss. The effects EVA abnormalities have on electrocochleography (ECochG) are unknown. Positive deflections in summation potential evoked by tone bursts were observed in 3/5 subjects, while a large negative deflection, similar to endolymphatic hydrops (EH), was observed for 2/5 subjects. The presence of an enlarged summation potential, with and without a compound action potential, was observed in response to a broadband click stimulus. Results suggest likely effects of a third window on ECochG responses and presence of EH in EVA.
ISSN:0165-5876
1872-8464
DOI:10.1016/j.ijporl.2020.110065