scholarly journals Effect of Initial Switch-On Within 24 Hours of Cochlear Implantation Using Slim Modiolar Electrodes: Potential Clinical Implications

2021 ◽  
Author(s):  
Woongsang Sunwoo ◽  
Hyoung Won Jeon ◽  
Byung Yoon Choi
Keyword(s):  
Cochlear Implants ◽  
Cochlear Implantation ◽  
Electrode Array ◽  
Clinical Implications ◽  
Electrode Impedance ◽  
Significant Drop ◽  
Early Stages ◽  
Post Operation ◽  
Lower Impedance ◽  
Conventional Switch

Abstract Reducing electrode impedance is an important factor in improving the functional benefits of cochlear implants (CIs). The immediate effect of early switch-on within 24 hours of surgery on impedance among CI recipients with various types of electrodes has been reported previously; however, the immediate change and the evolution of electrode impedances of slim modiolar electrodes after early switch-on within 24 hours of implantation has not. Therefore, the focus of this study was to compare the effect of early switch-on and conventional switch-on 3–4 weeks post-operation on impedance. Compared with impedance measured intraoperatively, our results demonstrate a significant drop in impedance for early switch-on, which sharply contrasted with elevated impedance values for conventional switch-on 3–4 weeks after implantation. Notably, a comparatively lower impedance than the conventional switch-on protocol was observed for up to 2 months post-operation. Most importantly, a much earlier stabilization of impedance can be achieved with the early switch-on protocol coupled with the slim modiolar electrode array compared to the conventional switch-on protocol, offering the advantage of reducing the number of required mapping sessions in the early stages of rehabilitation.

scholarly journals Effect of initial switch-on within 24 hours of cochlear implantation using slim modiolar electrodes

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Woongsang Sunwoo ◽  
Hyoung Won Jeon ◽  
Byung Yoon Choi
Keyword(s):  
Cohort Study ◽  
Cochlear Implants ◽  
Retrospective Cohort Study ◽  
Cochlear Implantation ◽  
Retrospective Cohort ◽  
Electrode Array ◽  
Electrode Impedance ◽  
Post Operation ◽  
Lower Impedance ◽  
Conventional Switch

AbstractReducing electrode impedance is an important factor in improving the functional benefits of cochlear implants (CIs). The immediate effect of early switch-on within 24 h of surgery on impedance among CI recipients with various types of electrodes has been reported previously; however, the immediate change and the evolution of electrode impedances of slim modiolar electrodes after early switch-on within 24 h of implantation has not. Therefore, the focus of this retrospective cohort study of CI patients was to compare the effect of early switch-on (n = 36) and conventional switch-on (n = 72) 2–4 weeks post-operation on impedance. Compared with impedance measured intraoperatively, our results demonstrate a significant decrease in impedance from 11.5 to 8.9 kΩ (p < 0.001) at 2–4 weeks after implantation in the early switch-on group, which sharply contrasted with elevated impedance values for conventional switch-on 2–4 weeks after implantation (from 10.7 to 14.2 kΩ, p = 0.001). Notably, a comparatively lower impedance than the conventional switch-on protocol was observed for up to 2 months post-operation. Most importantly, a much earlier stabilization of impedance can be achieved with the early switch-on protocol coupled with the slim modiolar electrode array compared to the conventional switch-on protocol, offering the advantage of reducing the number of required mapping sessions in the early stages of rehabilitation.

Effects of Electrode Array Length on Frequency-Place Mismatch and Speech Perception with Cochlear Implants

2015 ◽  
Vol 20 (2) ◽  
pp. 102-111 ◽  
Author(s):  
Frederic Venail ◽  
Caroline Mathiolon ◽  
Sophie Menjot de Champfleur ◽  
Jean Pierre Piron ◽  
Marielle Sicard ◽  
...  
Keyword(s):  
Speech Perception ◽  
Cochlear Implants ◽  
Cochlear Implantation ◽  
Electrode Array ◽  
Electrode Arrays ◽  
Frequency Map

Frequency-place mismatch often occurs after cochlear implantation, yet its effect on speech perception outcome remains unclear. In this article, we propose a method, based on cochlea imaging, to determine the cochlear place-frequency map. We evaluated the effect of frequency-place mismatch on speech perception outcome in subjects implanted with 3 different lengths of electrode arrays. A deeper insertion was responsible for a larger frequency-place mismatch and a decreased and delayed speech perception improvement by comparison with a shallower insertion, for which a similar but slighter effect was noticed. Our results support the notion that selecting an electrode array length adapted to each individual's cochlear anatomy may reduce frequency-place mismatch and thus improve speech perception outcome.

scholarly journals Clinical implications of intraoperative eABRs to the Evo®-CI electrode array recipients

2021 ◽  
Author(s):  
Fabiana Danieli ◽  
Ana Cláudia Mirândola Barbosa Reis ◽  
Eduardo Tanaka Massuda ◽  
Maria Stella Arantes do Amaral ◽  
Michel Hoen ◽  
...  
Keyword(s):  
Electrode Array ◽  
Clinical Implications

Cochlear implantation in a patient with severe cochlear hypoplasia

2012 ◽  
Vol 126 (11) ◽  
pp. 1172-1175 ◽  
Author(s):  
Y M Feng ◽  
Y Q Wu ◽  
J Wang ◽  
S K Yin
Keyword(s):  
Case Report ◽  
Cochlear Implantation ◽  
Internal Auditory Canal ◽  
Electrode Array

AbstractObjective:We report the case of a successful cochlear implantation in a patient with severe cochlear hypoplasia.Case report:The outcome of cochlear implantation is generally less favourable for patients with cochlear hypoplasia than for those with a normal cochlear structure. In the reported patient, part of the electrode array was inserted into the internal auditory canal. Nevertheless, the benefits following cochlear implantation seemed to outweigh the risks for this patient.Conclusion:Cochlear hypoplasia is not necessarily a contraindication for cochlear implantation.

scholarly journals Analysis of Neural Interface When Using Modiolar Electrode Stimulation. Radiological Evaluation, Trans-Impedance Matrix Analysis and Effect on Listening Effort in Cochlear Implantation

2021 ◽  
Vol 10 (17) ◽  
pp. 3962
Author(s):  
Angel Ramos-de-Miguel ◽  
Juan Carlos Falcón-González ◽  
Angel Ramos-Macias
Keyword(s):  
Cochlear Implantation ◽  
Randomized Study ◽  
Electrode Array ◽  
Matrix Analysis ◽  
Impedance Matrix ◽  
Test Results ◽  
Listening Effort ◽  
Deaf Adults ◽  
Discrimination Methods

Background: The proximity of the electrode to the modiolar wall may be of interest to investigate the effect of pitch discrimination. This research establishes the relation between these factors and whether perimodiolar positions may provide benefits regarding improved electrode discrimination. Methods: A prospective randomized study including 24 post-lingual deaf adults was performed. A psychoacoustic study was done by using a psychoacoustic research platform. Radiological study, and a cone-beam computed tomography was used to assess post cochlear implantation electrodes’ position. Trans-impedance matrix (TIM) analysis was performed after cochlear implant insertion in all cases, and pupillometry test was also performed. Results: 12 patients received a slim perimodiolar electrode array, and 12 patients received a straight electrode array. Although all the patients showed similar speech test results after 12 months follow-up, those implanted with a perimodiolar electrode obtained better scores in electrode discrimination test and pupillometry test, and showed more homogenous TIM patterns. Conclusions: The better positioning of the electrode array seams to provide a better hearing resolution and less listening effort trans-impedance matrix seems to be a useful tool to analyze positioning of the perimodiolar array.

scholarly journals Conductive hybrid carbon nanotube (CNT)–polythiophene coatings for innovative auditory neuron-multi-electrode array interfacing

RSC Advances ◽  
2016 ◽  
Vol 6 (48) ◽  
pp. 41714-41723 ◽  
Author(s):  
S. Ostrovsky ◽  
S. Hahnewald ◽  
R. Kiran ◽  
P. Mistrik ◽  
R. Hessler ◽  
...  
Keyword(s):  
Surface Modification ◽  
Carbon Nanotube ◽  
Cochlear Implants ◽  
Electrode Array ◽  
Auditory Neuron ◽  
Platinum Electrodes ◽  
Electrode Interface ◽  
Conductive Properties ◽  
Hybrid Carbon ◽  
Multi Electrode Array

Surface modification of platinum electrodes to improve neuron-electrode interface and electrode conductive properties in cochlear implants.

Safety of Cochlear Implantation in Children 12 Months or Younger: Systematic Review and Meta-analysis

2022 ◽  
pp. 019459982110677
Author(s):  
Firas Sbeih ◽  
Malek H. Bouzaher ◽  
Swathi Appachi ◽  
Seth Schwartz ◽  
Michael S. Cohen ◽  
...  
Keyword(s):  
Systematic Review ◽  
Cochlear Implants ◽  
Cochlear Implantation ◽  
Meta Analysis ◽  
Cochrane Central Register ◽  
Ovid Medline ◽  
Central Register ◽  
Data Source ◽  
Anesthetic Complications ◽  
Full Text Screening

Objective To systematically review the literature to determine safety of cochlear implantation in pediatric patients 12 months and younger. Data Source Ovid MEDLINE, EMBASE, CINAHL, and Cochrane Central Register of Controlled Trials (CENTRAL) databases were searched from inception to March 20, 2021. Review Methods Studies that involved patients 12 months and younger with report of intraoperative or postoperative complication outcomes were included. Studies selected were reviewed for complications, explants, readmissions, and prolonged hospitalizations. Two independent reviewers screened all studies that were selected for the systematic review and meta-analysis. All studies included were assessed for quality and risk of bias. Results The literature search yielded 269 studies, of which 53 studies underwent full-text screening, and 18 studies were selected for the systematic review and meta-analysis. A total of 449 patients and 625 cochlear implants were assessed. Across all included studies, major complications were noted in 3.1% of patients (95% CI, 0.8-7.1) and 2.3% of cochlear implantations (95% CI, 0.6-5.2), whereas minor complications were noted in 2.4% of patients (95% CI, 0.4-6.0) and 1.8% of cochlear implantations (95% CI, 0.4-4.3). There were no anesthetic complications reported across all included studies. Conclusion The results of this systematic review and meta-analysis suggest that cochlear implantation in patients 12 months and younger is safe with similar rates of complications to older cohorts.

Electrical Impedance Guides Electrode Array in Cochlear Implantation using Machine Learning and Robotic Feeder

2021 ◽  
pp. 108371
Author(s):  
Nauman Hafeez ◽  
Xinli Du ◽  
Nikolaos Boulgouris ◽  
Philip Begg ◽  
Richard Irving ◽  
...  
Keyword(s):  
Machine Learning ◽  
Cochlear Implantation ◽  
Electrical Impedance ◽  
Electrode Array

scholarly journals Costs involved in using a cochlear implant in South Africa

2012 ◽  
Vol 59 (1) ◽  
Author(s):  
Gillian Robyn Kerr ◽  
Seppo Tuomi ◽  
Alida Müller
Keyword(s):  
South Africa ◽  
Cochlear Implant ◽  
Cochlear Implants ◽  
Cochlear Implantation ◽  
Consumer Price Index ◽  
Information Costs ◽  
Profound Hearing Loss ◽  
Short And Long Term ◽  
Implant System

Cochlear implantation is an expensive but effective lifelong intervention for individuals with a severe-to-profound hearing loss. The primary aim of this study was to survey the short- and long-term costs of cochlear implantation. Individuals (N=154) using cochlear implants obtained from the University of Stellenbosch-Tygerberg Hospital Cochlear Implant Unit in Cape Town, South Africa were surveyed using a questionnaire and patient record review. The questionnaire used a combination of closed and open-ended questions to gather both quantitative and qualitative information. Costs were categorised as short- and long-term costs. All costs were converted to constant rands (June 2010) using the Consumer Price Index to allow for comparison in real terms over time. In the first 10 years of implantation the average estimated costs incurred by adults totalled R379 626, and by children R455 225. The initial purchase of the implant system was the most substantial cost, followed by upgrading of the processor. Travel and accommodation costs peaked in the first 2 years. On average the participants spent R2 550 per year on batteries and spares. Rehabilitation for children cost an average of R7 200. Insurance costs averaged R4 040 per year, and processor repairs R3 000 each. In addition to the upfront expense of obtaining the cochlear implant system, individuals using a cochlear implant in South Africa should be prepared for the long-term costs of maintenance, accessing the unit, support services and additional costs associated with use. Knowledge of these costs is important to ensure that individuals are successful users of their cochlear implants in the long term.

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