Response to Comment on Ohlenforst et al.

No abstract available

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Response to Comment on Ohlenforst et al.

No abstract available

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Comment on Ohlenforst et al. (2016) Exploring the Relationship Between Working Memory, Compressor Speed, and Background Noise Characteristics. Ear Hear 37, 137-143.

No abstract available

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Comment on Ohlenforst et al. (2016) Exploring the Relationship Between Working Memory, Compressor Speed, and Background Noise Characteristics. Ear Hear 37, 137-143.

No abstract available

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The Influence of Intraoperative Testing on Surgical Decision-making During Cochlear Implantation.

Objective: To review our use of intraoperative testing during cochlear implantation (CI) and determine its impact on surgical decision-making. Study Design: Retrospective chart review. Setting: Tertiary referral center. Patients: A total of 197 children and adults who underwent a total of 266 primary and/or revision CI by a single surgeon from 2010 to 2015. Intervention: Intraoperative electrophysiologic monitoring including evoked compound action potentials and electrical impedances. Main Outcome Measures: Whether surgical management was changed based on intraoperative testing. Results: In only 2 of 266 patients (0.8%), the back-up device was used due to findings on intraoperative testing. In three patients (1.1%), X-ray was performed intraoperatively to confirm intracochlear electrode placement, which was found to be normal in all patients. Conclusion: Our data suggest that with respect to CI in children and adults in straightforward cases (e.g., normal anatomy, nondifficult insertion, etc.), routine intraoperative evoked compound action potentials, impedances, and imaging rarely influence surgical decision-making in our clinic and may have limited usefulness in these patients. The implications of this are discussed and a review of the literature is presented. Copyright (C) 2017 by Otology & Neurotology, Inc. Image copyright (C) 2010 Wolters Kluwer Health/Anatomical Chart Company

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Outcomes and Time to Emergence of Auditory Skills After Cochlear Implantation of Children With Charge Syndrome.

Objective: Review perioperative complications, benefits, and the timeframe over which auditory skills develop in children with CHARGE syndrome who receive a cochlear implant (CI). Study Design: IRB-approved retrospective chart review of children with CHARGE syndrome who had at least 12 months of cochlear implant use. Setting: Tertiary care children's hospital. Patients: Twelve children, seven males and five females. Mean age implant = 3.5 years (1.7-8.2 yr); mean duration follow-up = 4.7 years (1.5-10.1 yr). Intervention: Cochlear implantation. Main Outcome Measures: Auditory skills categorized into four levels, temporal bone imaging findings, perioperative complications, time to emergence of speech perception, expressive communication mode. Results: All children imaged with magnetic resonance imaging had cochlear nerve deficiency in at least one ear. Speech awareness threshold improved with the CI compared with aided preoperative in 83% of children, with means of 51.7 dB SAT preoperative and 27.1 dB with the CI (p

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The Hannover Coupler: Controlled Static Prestress in Round Window Stimulation With the Floating Mass Transducer.

Introduction: Stimulation of the cochlear round window (RW) with the floating mass transducer (FMT) still suffers from large variation in clinical outcomes. Beside the geometric mismatch between RW and FMT diameter that is a known limiting factor in achieving optimal coupling between actuator and RW membrane, the applied static force between FMT and RW is usually undefined. In this study, the feasibility and efficacy of a specially designed FMT coupler permitting application of static preloads to the RW membrane to optimize FMT-RW coupling was investigated. Methods: Experiments were performed in fresh human cadaveric temporal bones. The "Hannover Coupler" FMT-prosthesis has a spherical tip (d=0.5 mm) at the front end and a spring at the prosthesis back that enables the application of static preloads and mobility of the FMT at the same time. Stapes footplate (SFP) displacements in response to acoustic stimulation of the tympanic membrane and to RW stimulation by the FMT were measured by a Laser-Doppler vibrometer. Results: Average SFP displacement responses of ASTM standard F2504-05 compliant temporal bones to RW stimulation by the "Hannover Coupler" were dependent on the applied force (~0-100 mN) and increased by up to 25 dB at frequencies >= 1 kHz. When averaged at speech relevant frequencies (0.5, 1, 2, 4 kHz) SFP displacements showed a global maximum at RW preloads of ~4 mN. Conclusion: The coupling between FMT and RW membrane was improved by the application of static RW preloads as indicated by increased SFP amplitudes to RW stimulation. Copyright (C) 2017 by Otology & Neurotology, Inc. Image copyright (C) 2010 Wolters Kluwer Health/Anatomical Chart Company

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