Bilateral cochlear implant user with a right ear scala vestibuli insertion and left ear scala tympani insertion: case report

2004 ◽  
Vol 1273 ◽  
pp. 455-458
Author(s):  
Aronson Leonor ◽  
Arauz Santiago Luis
Keyword(s):  
Case Report ◽  
Cochlear Implant ◽  
Scala Tympani ◽  
Cochlear Implant User ◽  
Bilateral Cochlear Implant ◽  
Scala Vestibuli

scholarly journals Binaural integration abilities in bilateral cochlear implant user

2015 ◽  
Vol 10 (4) ◽  
pp. 150-153 ◽  
Author(s):  
Chie Obuchi ◽  
Masae Shiroma ◽  
Sayaka Ogane ◽  
Kimitaka Kaga
Keyword(s):  
Cochlear Implant ◽  
Cochlear Implant User ◽  
Bilateral Cochlear Implant

scholarly journals Computed-tomography estimates of interaural mismatch in insertion depth and scalar location in bilateral cochlear-implant users

2021 ◽  
Author(s):  
Matthew J Goupell ◽  
Jack H Noble ◽  
Sandeep A Phatak ◽  
Elizabeth Kolberg ◽  
Miranda Cleary ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Cochlear Implant ◽  
Surgical Techniques ◽  
Superior Olivary Complex ◽  
Negative Consequences ◽  
Scala Tympani ◽  
Insertion Depth ◽  
Binaural Processing ◽  
Bilateral Cochlear Implant ◽  
Interaural Differences

Hypothesis: We hypothesized that the bilateral cochlear-implant (BI-CI) users would have a range of interaural insertion-depth mismatch because of different physical placements or characteristics of the arrays, but less than half of electrodes would have less than 75° or 3 mm of interaural insertion-depth mismatch. We also hypothesized that interaural insertion-depth mismatch would be more prevalent nearer the apex, when electrodes were located outside of scala tympani (i.e., possible interaural scalar mismatch), and when the arrays were a mix of pre-curved and straight types. Background: Brainstem neurons in the superior olivary complex are exquisitely sensitive to interaural differences, the cues to sound localization. These binaurally sensitive neurons rely on interaurally place-of-stimulation-matched inputs at the periphery. BI-CI users may have interaural differences in insertion depth and scalar location, causing interaural place-of-stimulation mismatch that impairs binaural abilities. Methods: Insertion depths and scalar locations were calculated from temporal-bone computed-tomography (CT) scans of 107 BI-CI users (27 Advanced Bionics, 62 Cochlear, and 18 Med-El). Each subject had either both pre-curved, both straight, or one of each type of array (mixed). Results: The median interaural insertion-depth mismatch was 23.4° or 1.3 mm. Relatively large interaural insertion-depth mismatch sufficient to disrupt binaural processing occurred for about 15% of electrode pairs [defined as >75° (13.0% of electrode pairs) or >3 mm (19.0% of electrode pairs)]. There was a significant three-way interaction of insertion depth, scalar location, and array type. Interaural insertion-depth mismatch was most prevalent when electrode pairs were more apically located, electrode pairs had interaural scalar mismatch (i.e., one in Scala Tympani, one in Scala Vestibuli), and when the arrays were both pre-curved. Conclusion: Large interaural insertion-depth mismatch can occur in BI-CI users. For new BI-CI users, improved surgical techniques to avoid interaural insertion-depth and scalar mismatch is recommended. For existing BI-CI users with interaural insertion-depth mismatch, interaural alignment of clinical frequency allocation tables by an audiologist might remediate any negative consequences to spatial-hearing abilities.

scholarly journals Evaluation of the Relationship between the NRT-Ratio, Cochlear Anatomy, and Insertions Depth of Perimodiolar Cochlear Implant Electrodes

2015 ◽  
Vol 2015 ◽  
pp. 1-6 ◽  
Author(s):  
Philipp Mittmann ◽  
Grit Rademacher ◽  
Sven Mutze ◽  
Frederike Hassepass ◽  
Arneborg Ernst ◽  
...  
Keyword(s):  
Cochlear Implant ◽  
Electrode Array ◽  
Scala Tympani ◽  
Flat Panel ◽  
Insertion Depth ◽  
Tomography System ◽  
Neural Response Telemetry ◽  
Auditory Performance ◽  
The Relationship ◽  
Scala Vestibuli

The position of the cochlear implant electrode array within the scala tympani is essential for an optimal postoperative hearing benefit. If the electrode array changes in between the scalae intracochlearly (i.e., from scala tympani to scala vestibuli), a reduced auditory performance can be assumed. We established a neural response telemetry-ratio (NRT-ratio) which corresponds with the scalar position of the electrodes but shows within its limits a variability. The aim of this study was to determine if insertion depth angle or cochlea size influences the NRT-ratio. The intraoperative electrophysiological NRT data of 26 patients were evaluated. Using a flat panel tomography system, the position of the electrode array was evaluated radiologically. The insertion depth angle of the electrode, the cochlea size, and the NRT-ratio were calculated postoperatively. The radiological results were compared with the intraoperatively obtained electrophysiological data (NRT-ratio) and statistically evaluated. In all patients the NRT-ratio, the insertion depth angle, and the cochlea size could be determined. A significant correlation between insertional depth, cochlear size, and the NRT-ratio was not found. The NRT-ratio is a reliable electrophysiological tool to determine the scalar position of a perimodiolar electrode array. The NRT-ratio can be applied independent from insertion depth and cochlear size.

Binaural sensitivity as a function of interaural electrode position with a bilateral cochlear implant user

2003 ◽  
Vol 114 (3) ◽  
pp. 1565-1574 ◽  
Author(s):  
Christopher J. Long ◽  
Donald K. Eddington ◽  
H. Steven Colburn ◽  
William M. Rabinowitz
Keyword(s):  
Cochlear Implant ◽  
Electrode Position ◽  
Cochlear Implant User ◽  
Bilateral Cochlear Implant

scholarly journals Preliminary studies on a bilateral cochlear implant user

1990 ◽  
Vol 88 (S1) ◽  
pp. S193-S193 ◽  
Author(s):  
R. van Hoesel ◽  
Y. C. Tong ◽  
R. D. Hollow ◽  
J. M. Huigen ◽  
G. M. Clark
Keyword(s):  
Cochlear Implant ◽  
Cochlear Implant User ◽  
Bilateral Cochlear Implant

Case Report: Top Hearing Performances of a Postlingually Deaf Cochlear Implant User

ORL ◽  
1992 ◽  
Vol 54 (6) ◽  
pp. 320-323
Author(s):  
P.O. Bucher ◽  
A. Mathis ◽  
N. de Min ◽  
W. Arnold
Keyword(s):  
Case Report ◽  
Cochlear Implant ◽  
Cochlear Implant User

Psychophysical and speech perception studies: A case report on a binaural cochlear implant subject

1993 ◽  
Vol 94 (6) ◽  
pp. 3178-3189 ◽  
Author(s):  
R. J. M. van Hoesel ◽  
Y. C. Tong ◽  
R. D. Hollow ◽  
G. M. Clark
Keyword(s):  
Case Report ◽  
Speech Perception ◽  
Cochlear Implant
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