scholarly journals Cochlear implantation restores cortical processing for spatial hearing in asymmetric hearing loss

2021 ◽  
Author(s):  
Chadlia Karoui ◽  
Kuzma Strelnikov ◽  
Pierre Payoux ◽  
Anne-Sophie Salabert ◽  
Chris James ◽  
...  
Keyword(s):  
Hearing Loss ◽  
Cochlear Implant ◽  
Cochlear Implantation ◽  
Spatial Hearing ◽  
Cortical Activity ◽  
Asymmetry Index ◽  
Hemispheric Dominance ◽  
Sound Localisation ◽  
Monaural Stimulation ◽  
Asymmetric Hearing Loss

In asymmetric hearing loss (AHL), the normal pattern of contralateral hemispheric dominance for monaural stimulation is modified, with a shift towards the hemisphere ipsilateral to the better ear. The extent of this shift has been shown to relate to sound localisation deficits. In this study, we examined whether cochlear implantation to treat AHL can restore the normal functional pattern of auditory cortical activity and whether this relates to improved sound localisation. We recruited 10 subjects with a cochlear implant for AHL (AHL-CI) and 10 normally-hearing controls. The participants performed a voice/non-voice discrimination task with binaural and monaural presentation of the sounds, and the cortical activity was measured using positron emission tomography (PET) brain imaging with a H215O tracer. The auditory cortical activity was found to be lower in the AHL-CI participants for all of the conditions. A cortical asymmetry index was calculated and showed that a normal contralateral dominance was restored in the AHL-CI patients for the non-implanted ear, but not for the ear with the cochlear implant. It was found that the contralateral dominance for the non-implanted ear strongly correlated with sound localisation performance (rho = 0.8, p < 0.05). We conclude that the restoration of binaural mechanisms in AHL-CI subjects reverses the abnormal lateralisation pattern induced by the deafness, and that this leads to improved spatial hearing. Our results suggest that cochlear implantation fosters the rehabilitation of binaural excitatory/inhibitory cortical interactions, which could enable the reconstruction of the auditory spatial selectivity needed for sound localisation.

Considerations for Pediatric Cochlear Implant Recipients With Unilateral or Asymmetric Hearing Loss: Assessment, Device Fitting, and Habilitation

2017 ◽  
Vol 26 (2) ◽  
pp. 91-98 ◽  
Author(s):  
Laura Greaver ◽  
Hannah Eskridge ◽  
Holly F. B. Teagle
Keyword(s):  
Hearing Loss ◽  
Cochlear Implant ◽  
Cochlear Implantation ◽  
Clinical Report ◽  
Loss Assessment ◽  
Profound Hearing Loss ◽  
Single Sided Deafness ◽  
Asymmetric Hearing Loss ◽  
Case Basis ◽  
Moderate Hearing Loss

Purpose The purpose of this clinical report is to present case studies of children who are nontraditional candidates for cochlear implantation because they have significant residual hearing in 1 ear and to describe outcomes and considerations for their audiological management and habilitation. Method Case information is presented for 5 children with profound hearing loss in 1 ear and normal or mild-to-moderate hearing loss in the opposite ear and who have undergone unilateral cochlear implantation. Pre- and postoperative assessments were performed per typical clinic routines with modifications described. Postimplant habilitation was customized for each recipient using a combination of traditional methods, newer technologies, and commercial materials. Results The 5 children included in this report are consistent users of their cochlear implants and demonstrate speech recognition in the implanted ear when isolated from the better hearing ear. Conclusions Candidacy criteria for cochlear implantation are evolving. Children with single-sided deafness or asymmetric hearing loss who have traditionally not been considered candidates for cochlear implantation should be evaluated on a case-by-case basis. Audiological management of these recipients is not vastly different compared with children who are traditional cochlear implant recipients. Assessment and habilitation techniques must be modified to isolate the implanted ear to obtain accurate results and to provide meaningful therapeutic intervention.

scholarly journals Cochlear Implantation in Cases of Asymmetric Hearing Loss: Subjective Benefit, Word Recognition, and Spatial Hearing

2020 ◽  
Vol 24 ◽  
pp. 233121652094552
Author(s):  
Margaret T. Dillon ◽  
Emily Buss ◽  
Meredith A. Rooth ◽  
English R. King ◽  
Sarah A. McCarthy ◽  
...  
Keyword(s):  
Hearing Loss ◽  
Word Recognition ◽  
Hearing Aids ◽  
Cochlear Implantation ◽  
Bone Conduction ◽  
Spatial Hearing ◽  
Published Data ◽  
Profound Hearing Loss ◽  
Hearing Sensitivity ◽  
Asymmetric Hearing Loss

A prospective clinical trial evaluated the effectiveness of cochlear implantation in adults with asymmetric hearing loss (AHL). Twenty subjects with mild-to-moderate hearing loss in the better ear and moderate-to-profound hearing loss in the poorer ear underwent cochlear implantation of the poorer hearing ear. Subjects were evaluated preoperatively and at 1, 3, 6, 9, and 12 months post-activation. Preoperative performance was evaluated unaided, with traditional hearing aids (HAs) or with a bone-conduction HA. Post-activation performance was evaluated with the cochlear implant (CI) alone or in combination with a contralateral HA (bimodal). Test measures included subjective benefit, word recognition, and spatial hearing (i.e., localization and masked sentence recognition). Significant subjective benefit was reported as early as the 1-month interval, indicating better performance with the CI compared with the preferred preoperative condition. Aided word recognition with the CI alone was significantly improved at the 1-month interval compared with preoperative performance with an HA and continued to improve through the 12-month interval. Subjects demonstrated early, significant improvements in the bimodal condition on the spatial hearing tasks compared with baseline preoperative performance tested unaided. The magnitude of the benefit was reduced for subjects with AHL when compared with published data on CI users with normal hearing in the contralateral ear; this finding may reflect significant differences in age at implantation and hearing sensitivity across cohorts.

scholarly journals Outcome of cochlear implantation in the worse ear of post-lingual asymmetric hearing loss: elucidation of prognostic markers

2021 ◽  
pp. 1-7
Author(s):  
Sang-Youp Lee ◽  
Goun Choe ◽  
Sang-Yeon Lee ◽  
Namju Justin Kim ◽  
Marge Carandang ◽  
...  
Keyword(s):  
Hearing Loss ◽  
Cochlear Implantation ◽  
Prognostic Markers ◽  
Asymmetric Hearing Loss

Impact of Cochlear Implantation on Neurocognitive Subdomains in Adult Cochlear Implant Recipients

2021 ◽  
pp. 1-10
Author(s):  
Christiane Völter ◽  
Lisa Götze ◽  
Imme Haubitz ◽  
Janine Müther ◽  
Stefan Dazert ◽  
...  
Keyword(s):  
Hearing Loss ◽  
Cochlear Implant ◽  
Cochlear Implantation ◽  
Verbal Fluency ◽  
Homogeneous Population ◽  
Delayed Recall ◽  
Hearing Status ◽  
Age Related ◽  
Significant Difference ◽  
The Impact

<b><i>Introduction:</i></b> Age-related hearing loss affects about one-third of the population worldwide. Studies suggest that hearing loss may be linked to cognitive decline and auditory rehabilitation may improve cognitive functions. So far, the data are limited, and the underlying mechanisms are not fully understood. The study aimed to analyze the impact of cochlear implantation on cognition in a large homogeneous population of hearing-impaired adults using a comprehensive non-auditory cognitive assessment with regard to normal-hearing (NH) subjects. <b><i>Material and Methods:</i></b> Seventy-one cochlear implant (CI) candidates with a postlingual, bilateral severe or profound hearing loss aged 66.3 years (standard deviation [SD] 9.2) and 105 NH subjects aged 65.96 years (SD 9.4) were enrolled. The computer-based neurocognitive tool applied included 11 subtests covering attention (M3), short- and long-term memory (recall and delayed recall), working memory (0- and 2-back, Operation Span [OSPAN] task), processing speed (Trail Making Test [TMT] A), mental flexibility (TMT B), inhibition (cFlanker and iFlanker), and verbal fluency. CI patients underwent a neurocognitive testing preoperatively as well as 12 months postoperatively. Impact of hearing status, age, gender, and education on cognitive subdomains was studied. Additionally, after controlling for education and age, cognitive performance of CI subjects (<i>n</i> = 41) was compared to that of NH (<i>n</i> = 34). <b><i>Results:</i></b> CI users achieved significantly better neurocognitive scores 12 months after cochlear implantation than before in most subtests (M3, [delayed] recall, 2-back, OSPAN, iFlanker, and verbal fluency; all <i>p</i> &#x3c; 0.05) except for the TMT A and B. A significant correlation could be found between the postoperative improvement in speech perception and in the attentional task M3 (<i>p</i> = 0.01). Hearing status (<i>p</i> = 0.0006) had the strongest effect on attention, whereas education had a high impact on recall (<i>p</i> = 0.002), OSPAN (<i>p</i> = 0.0004), and TMT A (<i>p</i> = 0.005) and B (<i>p</i> = 0.003). Inhibition was mainly age-dependent with better results in younger subjects (<i>p</i> = 0.016). Verbal fluency was predicted by gender as females outperformed men (<i>p</i> = 0.009). Even after controlling for age and education NH subjects showed a significantly better performance than CI candidates in the recall (<i>p</i> = 0.03) and delayed recall (<i>p</i> = 0.01) tasks. Postoperatively, there was no significant difference between the 2 groups anymore. <b><i>Conclusion:</i></b> Impact of cochlear implantation on neurocognitive functions differs according to the cognitive subdomains. Postoperatively, CI recipients performed as good as age- and education-matched NH subjects.

Cochlear Implantation in Adults With Asymmetric Hearing Loss

2018 ◽  
Vol 39 (5) ◽  
pp. 576-581 ◽  
Author(s):  
Douglas P. Sladen ◽  
Matthew L. Carlson ◽  
Brittany P. Dowling ◽  
Amy P. Olund ◽  
Melissa D. DeJong ◽  
...  
Keyword(s):  
Hearing Loss ◽  
Cochlear Implantation ◽  
Asymmetric Hearing Loss

Cochlear Implant Patients with Superficial Siderosis

2009 ◽  
Vol 20 (06) ◽  
pp. 348-352 ◽  
Author(s):  
Sarah A. Sydlowski ◽  
Michael J. Cevette ◽  
Jon Shallop ◽  
David M. Barrs
Keyword(s):  
Central Nervous System ◽  
Hearing Loss ◽  
Cochlear Implant ◽  
Cochlear Implantation ◽  
Case Reports ◽  
Superficial Siderosis ◽  
Viable Option ◽  
Retrospective Case ◽  
Fatal Disease ◽  
The Central Nervous System

Background: Considered a rare disorder, superficial siderosis of the central nervous system (SSCN) has become more frequently diagnosed in recent years. As it is characterized by progressive sensorineural hearing loss, patients' needs may surpass the capability of hearing aid technology. Despite the retrocochlear nature of the disorder, patients have undergone cochlear implantation (CI) with varying success. Purpose: To summarize the issues surrounding cochlear implant candidates with SSCN as well as highlight trends in performance postimplantation. Research Design: Retrospective case reports of seven cochlear implant candidates detail the symptoms, typical audiologic presentation, and array of clinical issues for patients with this progressive and potentially fatal disease. Results: Despite the retrocochlear component of a hearing loss caused by SSCN, cochlear implantation may be a viable option. Conclusions: It is essential that the CI audiologist not only be aware of the disorder but also be well versed in the resulting implications for the cochlear implant process. A more thorough case history, an expanded candidacy test battery, and knowledge of the typical presentation of SSCN are critical. The diagnosis of SSCN will impact expectations for success with the cochlear implant, and counseling should be adjusted accordingly.

scholarly journals Complications of cochlear implant surgery

2004 ◽  
Vol 132 (9-10) ◽  
pp. 302-305 ◽  
Author(s):  
Rade Kosanovic ◽  
Zoran Ivankovic ◽  
Sandra Stojanovic
Keyword(s):  
Hearing Loss ◽  
Cochlear Implant ◽  
Cochlear Implantation ◽  
Fatal Outcome ◽  
Modern Technology ◽  
Hearing Impairments ◽  
Severe Hearing Loss ◽  
Cochlear Implant Surgery ◽  
Coding Strategies ◽  
The World

During the last several decades, cochlear implant has been fully recognized in treatment of severe hearing loss. Development of modern technology enabled inconceivable possibilities of technical qualities of the device as well as development of usable coding strategies, which led to extraordinary results in patient rehabilitation. Although cochlear implantation has become one of the routine operative procedures throughout the world nowadays, it gives rise to certain complications. These complications, though rare, can sometimes be very serious, even with fatal outcome. If cochlear implantation is performed by experienced and well-educated team of experts, the possibility of complications is minimal and is certainly not the argument against cochlear implantation as a method of treatment of severe hearing impairments.

Outcomes of Cochlear Implantation in Adults with Asymmetric Hearing Loss

2015 ◽  
Vol 36 (3) ◽  
pp. 409-415 ◽  
Author(s):  
Emily Franko-Tobin ◽  
Phillip Ryan Camilon ◽  
Elizabeth Camposeo ◽  
Meredith A. Holcomb ◽  
Ted A. Meyer
Keyword(s):  
Hearing Loss ◽  
Cochlear Implantation ◽  
Asymmetric Hearing Loss

scholarly journals Subjective Benefits of Bimodal Listening in Cochlear Implant Recipients with Asymmetric Hearing Loss

2020 ◽  
Vol 162 (6) ◽  
pp. 933-941 ◽  
Author(s):  
Nicholas J. Thompson ◽  
Margaret T. Dillon ◽  
Emily Buss ◽  
Meredith A. Rooth ◽  
English R. King ◽  
...  
Keyword(s):  
Quality Of Life ◽  
Hearing Loss ◽  
Word Recognition ◽  
Cochlear Implant ◽  
Sound Field ◽  
Profound Hearing Loss ◽  
Sentence Recognition ◽  
Academic Center ◽  
Asymmetric Hearing Loss

Objective To investigate the influence of cochlear implant (CI) use on subjective benefits in quality of life in cases of asymmetric hearing loss (AHL). Study Design Prospective clinical trial. Setting Tertiary academic center. Subjects and Methods Subjects included CI recipients with AHL (n = 20), defined as moderate-to-profound hearing loss in the affected ear and mild-to-moderate hearing loss in the contralateral ear. Quality of life was assessed with the Speech, Spatial, and Qualities of Hearing Scale (SSQ) pragmatic subscales, which assess binaural benefits. Subjective benefit on the pragmatic subscales was compared to word recognition in quiet and spatial hearing abilities (ie, masked sentence recognition and localization). Results Subjects demonstrated an early, significant improvement ( P < .01) in abilities with the CI as compared to preoperative abilities on the SSQ pragmatic subscales by the 1-month interval. Perceived abilities were either maintained or continued to improve over the study period. There were no significant correlations between results on the Speech in Quiet subscale and word recognition in quiet, the Speech in Speech Contexts subscale and masked sentence recognition, or the Localization subscale and sound field localization. Conclusions CI recipients with AHL report a significant improvement in quality of life as measured by the SSQ pragmatic subscales over preoperative abilities. Reported improvements are observed as early as 1 month postactivation, which likely reflect the binaural benefits of listening with bimodal stimulation (CI and contralateral hearing aid). The SSQ pragmatic subscales may provide a more in-depth insight into CI recipient experience as compared to behavioral sound field measures alone.

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