Cochlear Implants International[JOURNAL]
Sun
200 papers
Accuracy of radiological prediction of electrode position with otological planning software and implications of high-resolution imaging.
Müller-Graff FT, Voelker J, Kurz A … +3 more , Hagen R, Neun T, Rak K
Cochlear Implants Int · 2023 May · PMID 36617441 · Publisher ↗
OBJECTIVES: In cochlear implantation, preoperative prediction of electrode position has recently gained increasing attention. Currently, planning is usually done by multislice CT (MSCT). However, flat-panel volume CT (fp...
OBJECTIVES: In cochlear implantation, preoperative prediction of electrode position has recently gained increasing attention. Currently, planning is usually done by multislice CT (MSCT). However, flat-panel volume CT (fpVCT) and its secondary reconstructions (fpVCT) allow for more precise visualization of the cochlea. Combined with a newly developed otological planning software, the position of every single contact can be effectively predicted. In this study it was investigated how accurately radiological prediction forecasts the postoperative electrode localization and whether higher image resolution is advantageous. METHODS: Utilizing otological planning software (OTOPLAN®) and different clinical imaging modalities (MSCT, fpVCT and fpVCT) the electrode localization [angular insertion depth (AID)] and respective contact frequencies were predicted preoperatively and examined postoperatively. Furthermore, inter-electrode-distance (IED) and inter-electrode-frequency difference (IEFD) were evaluated postoperatively. RESULTS: Measurements revealed a preoperative overestimation of AID. Corresponding frequencies were also miscalculated. Determination of IED and IEFD revealed discrepancies at the transition from the basal to the middle turn and round window to the basal turn. All predictions and discrepancies were lowest when using fpVCT. CONCLUSION: The postoperative electrode position can be predicted quite accurately using otological planning software. However, because of several potential misjudgments, high-resolution imaging, such as offered by fpVCT, should be used pre- and postoperatively.
Cochlear re-implantation with the use of multi-mode grounding associated with anodic monophasic pulses to manage abnormal facial nerve stimulation.
Hyppolito MA, Barbosa Reis ACM, Danieli F … +2 more , Hussain R, Le Goff N
Cochlear Implants Int · 2023 Mar · PMID 36583989 · Publisher ↗
To investigate the outcomes of cochlear re-implantation using multi-mode grounding stimulation associated with anodic monophasic pulses to manage abnormal facial nerve stimulation (AFNS) in cochlear implant (CI) recipien...
To investigate the outcomes of cochlear re-implantation using multi-mode grounding stimulation associated with anodic monophasic pulses to manage abnormal facial nerve stimulation (AFNS) in cochlear implant (CI) recipients. Retrospective case report. An adult CI recipient with severe AFNS and decrease in auditory performance was re-implanted with a new CI device to change the pulse shape and stimulation mode. Patient's speech perception scores and AFNS were compared before and after cochlear re-implantation, using monopolar stimulation associated with cathodic biphasic pulses and multi-mode stimulation mode associated to anodic monophasic pulses, respectively. The insertion depth angle and the electrode-nerve distances were also investigated, before and after cochlear re-implantation. AFNS was resolved, and the speech recognition scores rapidly increased in the first year after cochlear re-implantation while remaining stable. After cochlear re-implantation, the e15 and e20 electrodes showed shorter electrode-nerve distances compared to their correspondent e4 and e7 electrodes, which induced AFNS in the first implantation. Cochlear re-implantation with multi-mode grounding stimulation associated with anodic monophasic pulses was an effective strategy for managing AFNS. The patient's speech perception scores rapidly improved and AFNS was not detected four years after cochlear re-implantation.
Cochlear implantation through intracochlear fibrosis: A comparison of surgical techniques.
Maxwell AK, Kahane JB, Mehta R … +1 more , Arriaga MA
Cochlear Implants Int · 2023 Mar · PMID 36529996 · Publisher ↗
OBJECTIVE: While the implications of ossification on cochlear implantation (CI) have been extensively described, there is a paucity of data regarding the fibrotic stage. We examined the outcomes of different insertion te...
OBJECTIVE: While the implications of ossification on cochlear implantation (CI) have been extensively described, there is a paucity of data regarding the fibrotic stage. We examined the outcomes of different insertion techniques for managing intracochlear fibrosis. STUDY DESIGN: Retrospective review of case series with case-control comparison. SETTING: University-based tertiary-referral otology-neurotology practice. PATIENTS: Between 2009 to 2020, 384 patients underwent CI. Of those, 7 patients (8 ears) demonstrated intracochlear fibrosis. INTERVENTIONS: CI performed 1-4 months following meningitis/labyrinthitis and 12-24 months after idiopathic sudden SNHL. Fibrosis removal (38%) or dilation (63%) permitted implantation. A styleted-electrode was used in 63% due to dense fibrosis. MAIN OUTCOME MEASURES: Postoperative audiometry with CI in place, additional comparisons with audiometric outcomes in age-matched controls. RESULTS: Full insertion achieved in all except one ear with partial ossification. Mean ipsilateral pure tone average (PTA) improved to 29 ± 15 dB and speech discrimination to 72 ± 28%. Fibrosis removal vs. dilation resulted in no PTA differences ( = 0.76). Poorest outcomes occurred with the longest time to surgery. CONCLUSIONS: Good CI audiologic outcomes in the setting of cochlear fibrosis can be achieved and are independent of technique. Instead, they vary with time to implantation. Every attempt should be made to intervene as early as possible.
Perception of timbre in adult Cochlear implant users: Comparison of Iranian and Western musical instruments.
Dasdar S, Nasresfahani A, Kianfar N … +4 more , Zarandi MM, Mobedshahi F, Dabiri S, Kouhi A
Cochlear Implants Int · 2023 Jan · PMID 36495227 · Publisher ↗
OBJECTIVES: Cochlear implants (CI) have dramatically improved speech perception for patients with sensorineural hearing impairment. However, listening to music is a great challenge for them. This study examined the perce...
OBJECTIVES: Cochlear implants (CI) have dramatically improved speech perception for patients with sensorineural hearing impairment. However, listening to music is a great challenge for them. This study examined the perception and appraisal of Iranian musical instruments comparing with similar Western instruments. METHODS: Eleven adult CI users and 25 normal hearing (NH) individuals participated in this study. Musical stimuli of three commonly heard instrument pairs were prepared. Participants were asked to identify the instruments and rate their appraisal on a ten-point Likert scale (0 = dislike very much, 10 = like very much). RESULTS: The instrument recognition rate was 40.6% among the CI users, and the mean appraisal score was 5.2 ± 2.7. NH listeners had none significant higher scores on both tasks with a recognition rate of 50.0% and the mean appraisal score of 6.9 ± 1.5. Iranian instruments were more recognized in both groups. Regarding their appraisal, the mean score for both types was almost equal in the NH group, while CI users more appraised Iranian instruments. CONCLUSION: In addition to better recognition of Iranian instruments, they were particularly better appraised in the CI group. Iranian instruments provide suitable musical pieces for CI recipients that can be considered in rehabilitation programs.
The effect of sentence length on question comprehension in children with cochlear implants.
DeLuca ZW, Schwartz RG, Marton K … +4 more , Houston DM, Ying E, Steinman S, Drakopoulou G
Cochlear Implants Int · 2023 Jan · PMID 36495226 · Full text
OBJECTIVES: The present study investigated the comprehension of subject and object and questions in children with cochlear implants (CI). METHODS: Growth Curve Analysis (GCA) was used to compare eye gaze fixations and...
OBJECTIVES: The present study investigated the comprehension of subject and object and questions in children with cochlear implants (CI). METHODS: Growth Curve Analysis (GCA) was used to compare eye gaze fixations and gaze patterns to the appropriate subject or object nouns within a four-picture array between 16 children with CI and 31 children with typical hearing (aged 7;0-12;0) on wh-questions with and without added adjectives to increase length. Offline accuracy was also compared. RESULTS: Findings indicated children with typical hearing exhibited more fixations to the target noun across all conditions, supporting higher comprehension accuracy. Both groups of children demonstrated more fixations to the target noun in object questions and questions without added length. Patterns of eye movement were significantly different between groups, suggesting different patterns of eye gaze across the array before fixation on the target noun. Children with CI exhibited fewer fixations, slower speed to fixation, and differences in gaze patterns that may imply the presence of processing limitations. Error analyses also suggested that children with CI frequently fixated on a picture similar to the target noun. CONCLUSIONS: Results indicate children with CI comprehend questions more slowly than their hearing peers, which may be related to limitations in working memory.
Cochlear implants and deep brain stimulators.
Kons ZA, Holloway KL, Coelho DH
Cochlear Implants Int · 2023 May · PMID 36461790 · Publisher ↗
OBJECTIVE AND IMPORTANCE: With an aging population and increasing utilization of both cochlear implants (CI) to treat hearing loss and deep brain stimulation (DBS) to treat neurodegenerative movement disorders, more pati...
OBJECTIVE AND IMPORTANCE: With an aging population and increasing utilization of both cochlear implants (CI) to treat hearing loss and deep brain stimulation (DBS) to treat neurodegenerative movement disorders, more patients will be sequentially implanted with the two devices. As such, understanding both presurgical evaluations and surgical procedures will be of great importance to the treating cochlear implant surgeon and neurosurgeon in optimizing outcomes for both conditions. CLINICAL PRESENTATION: Two illustrative cases of sequential CI followed by DBS are reviewed. Relevant pre-, intra-, and postoperative issues are discussed for both DBS following CI surgery and CI following DBS surgery. CONCLUSION: Despite the potential for challenges, sequential CI and DBS (and vice versa) can provide substantial benefit to those individuals with severe hearing loss and movement disorders. A thorough understanding of both devices is critical to ensuring optimal outcomes.
Cochlear implant electrode array tip-foldover detection by electrode voltage telemetry.
Leblans M, Zarowski A, Molisz A … +5 more , van Dinther J, Dedeyne J, Lerut B, Kuhweide R, Offeciers E
Cochlear Implants Int · 2023 Mar · PMID 36448741 · Publisher ↗
OBJECTIVES: With the introduction of more flexible and thinner electrodes, such as Cochlear's Slim Modiolar Electrode, there is a higher risk of electrode insertion problems, in particular the tip foldover. Timely intrao...
OBJECTIVES: With the introduction of more flexible and thinner electrodes, such as Cochlear's Slim Modiolar Electrode, there is a higher risk of electrode insertion problems, in particular the tip foldover. Timely intraoperative detection of the problem would allow for direct intraoperative correction. This paper describes a non-radiological method for intraoperative tip foldover detection that is applicable in all surgical centers and can quickly deliver accurate results. METHODS: Postoperative radiographs of 118 CI-recipients implanted with Nucleus devices were retrospectively analyzed on the presence of a tip foldover. Electrode Voltage Telemetry (EVT), also called Electric Field Imaging, was performed by means of Cochlear's EVT software tool, which is now integrated into Custom Sound-EP as the Trans-Impedance-Matrix measurement option. Tip foldover detection was automated by using the linear Hough transform for extracting straight-line patterns in the Trans-Impedance Matrix's heatmap. RESULTS: The six cases of electrode tip foldover were accurately identified by the EVT measurements, including two cases with folding location very close to the electrode tip (contact 20). CONCLUSION: Electrode Voltage Telemetry measures the Trans-Impedance Matrix, which can accurately detect tip foldovers of the cochlear implant electrodes within 1 min. This method can be reliably applied in all patients with normal cochlear anatomy and is able to intraoperatively detect foldovers localized even very close to the electrode tip. Application of the linear Hough transform allows for automatic detection of electrode tip foldovers that shows excellent agreement with visual evaluation of the radiological images and the transimpedance matrix's heatmap.
Efficacy of auditory verbal therapy in children with cochlear implantation based on auditory performance - A systematic review.
Noel A, Manikandan M, Kumar P
Cochlear Implants Int · 2023 Jan · PMID 36416476 · Publisher ↗
This systematic review focuses on the efficacy of auditory verbal therapy (AVT) in children with cochlear implants based on their auditory performance. The results presented are based on research findings from 2010 to 20...
This systematic review focuses on the efficacy of auditory verbal therapy (AVT) in children with cochlear implants based on their auditory performance. The results presented are based on research findings from 2010 to 2021. The systematic review was designed based on the Popular Reporting Systems for the Systematic Review and Analysis of Meta-Analysts (PRISMA), the 2020 revised version, and the Critical Evidence for Clinical Evidence (CATE) checklist. Specific keywords were chosen based on the formulated research question and searched on the following search engines: Google Scholar, Microsoft Academic, PubMed, Semantic Scholar, Cochrane, Science Direct, and BASE. All the searched articles were analysed based on specific exclusion criteria. The results revealed an important progression based on the auditory performance among children with cochlear implantation who received habilitation. The studies highlight that younger the age at implantation better the auditory performance and this may be necessary to allow at least relatively normal organization of auditory pathways in pre-lingual children with hearing impairment. Therefore, regular revitalization of aural-verbal rehabilitation and speech and language therapy is essential for younger children with hearing impairment to achieve the highest level of hearing function. This systematic review highlights importance of assessment of the auditory performance to be considered in the test battery while evaluating children with CI before and after habilitation along with AVT.
HiRes ultra series cochlear implant field recall: failure rates and early outcomes.
Winchester A, Kay-Rivest E, Friedmann DR … +5 more , McMenomey SO, Shapiro WH, Roland JT, Waltzman S, Jethanamest D
Cochlear Implants Int · 2023 Mar · PMID 36411064 · Publisher ↗
OBJECTIVE: Evaluate rates of Advanced Bionics Ultra 3D/Ultra cochlear implant failure in the setting of a worldwide device recall and report surgical and auditory outcomes after revision. METHODS: Retrospective chart rev...
OBJECTIVE: Evaluate rates of Advanced Bionics Ultra 3D/Ultra cochlear implant failure in the setting of a worldwide device recall and report surgical and auditory outcomes after revision. METHODS: Retrospective chart review was performed for adult and pediatric patients implanted with at risk devices at our center from 2016 to 2020. Device failure rates, surgical, and auditory outcomes were recorded and analyzed. RESULTS: Of 113 at-risk devices, 20 devices (17.7%) in 18 patients (two bilaterally implanted) were identified as failures. All devices were with mid-scala electrodes. Eleven patients (61.1%) were children and 7 (38.9%) adults. Twelve patients were found to have failing devices after reporting subjective performance decline; the remainder were prompted by manufacturer notification. All were revised, with the majority (83.3%) choosing the same manufacturer. All had uncomplicated original and revision insertions. Among adults, average word scores on the revised side were stable pre- to post-revision ( = 0.95). DISCUSSION: Patients with device failure due to this field action performed well after revision implantation. Patients with bilateral at-risk devices but evidence of unilateral failure may elect to undergo simultaneous empiric revision of the contralateral device. Three patients who elected to change device manufacturers on revision have variable results that require further investigation. CONCLUSIONS: Patients requiring revision for a device field action overall perform well. At-risk devices continue to require monitoring as a growing number are likely to fail over time.
Reading comprehension skill in English as a second language of Japanese middle school students with cochlear implants.
Shirai K, Kawano A, Ohta Y … +1 more , Tsukahara K
Cochlear Implants Int · 2023 Jan · PMID 36373935 · Publisher ↗
OBJECTIVES: To assess the English reading comprehension skill of Japanese middle school students with cochlear implants (CIs). MATERIALS AND METHODS: The subjects were pre- or perilingually deafened CI recipients between...
OBJECTIVES: To assess the English reading comprehension skill of Japanese middle school students with cochlear implants (CIs). MATERIALS AND METHODS: The subjects were pre- or perilingually deafened CI recipients between seventh and ninth grades (age 12-15 years). English reading comprehension skill was evaluated using the Norm Referenced Test developed for Japanese students. Furthermore, factors related to English reading comprehension were assessed, focusing on a total of 11 variables: age; sex; age at CI; length of CI use; aided pure-tone thresholds with CI; Japanese listening word recognition score; performance intelligence quotient (PIQ) score; verbal intelligence quotient (VIQ); grade; school type; and Japanese reading comprehension skill. RESULTS: A total of 40 subjects completed the test. Their average word recognition score was good, at 80.2%,and the average age at CI was late, at 4.4 years. The chi-square goodness of fit test showed the English reading comprehension skill level deviated toward lower achievement in the students with CIs compared with children with normal-hearing. VIQ and Japanese reading comprehension skill were correlated with English reading skill. On the other hand, there was no relationship between English reading skill and the factors of hearing level and CI experience.
Translation, adaptation, and validation of the Arabic version of the meaningful auditory integration scale.
Garadat SN, Almasri NA
Cochlear Implants Int · 2023 Jan · PMID 36369726 · Publisher ↗
OBJECTIVES: The main objectives of this study were to translate and adapt the infant-toddler meaningful integration scale (IT-MAIS) into Arabic and to establish the psychometric properties of the translated scale in chil...
OBJECTIVES: The main objectives of this study were to translate and adapt the infant-toddler meaningful integration scale (IT-MAIS) into Arabic and to establish the psychometric properties of the translated scale in children with a cochlear implant. METHODS: The translation and cross-cultural adaptation of this questionnaire were completed in multiple steps and following standard translation protocols. In total, twenty-eight parents of young cochlear implant recipients completed IT-MAIS. Data were collected postoperatively and at 3-, 6-, 9-, and 12-month post-device activation. Data were examined for the validity and reliability of the scale. The internal consistency and reliability of the scale were analyzed using Cronbach , split-half reliability, and the corrected item-total correlation coefficients. RESULTS: Findings demonstrated that the scale exhibited good face and content validity, suggesting that the scale is a one-dimensional measure. Additionally, the reliability analysis for the scale indicated high reliability and correlation among test items. IT-MAIS scores consistently improved over time for all participants and this improvement. correlated negatively with the duration of deafness. CONCLUSION: Current findings indicated that the translated Arabic version of the IT-MAIS scale could serve as a valid instrument for assessing the development of auditory skills in Arabic-speaking children with cochlear implants.
Evaluating the accuracy of speech to text applications for cochlear implant candidates during COVID-19.
Roychowdhury P, Castillo-Bustamante M, Gandhi D … +4 more , Knoll RM, Wu MJ, Kozin ED, Remenschneider AK
Cochlear Implants Int · 2023 Jan · PMID 36148962 · Publisher ↗
OBJECTIVES: Universal mask wearing due to COVID-19 has introduced barriers to clear communication. In hearing impaired individuals this can impact informed surgical consent. For cochlear implant candidates, who do not re...
OBJECTIVES: Universal mask wearing due to COVID-19 has introduced barriers to clear communication. In hearing impaired individuals this can impact informed surgical consent. For cochlear implant candidates, who do not rely on sign language, real-time transcription with a stenographer (CART) is the gold-standard in assistive technologies. If CART is not available, speech to text (STT) applications have been advertised as solutions, but their transcription accuracy with or without an N95 mask is not well-established. Herein, we sought to investigate the transcription accuracy of three STT solutions for iPhone and compare their performance to the CART service at our institution. METHODS: Three native English speakers and three non-native English speakers read two passages (a cochlear implant consent and the non-medical 'Rainbow passage') with and without an N95 mask. Error rates from the comparison of the transcript (from either the STT app or CART) with the original passage were calculated. RESULTS: The CART service had the lowest error rate of all testing conditions (4.79-7.14%). Ava 24/7 (15.0 ± 9.49%) and the iPhone dictation (15.6 ± 6.65%) had significantly lower average error rates than the Live Transcribe (37.7 ± 20.3%) ( < 0.0001) application. Neither the presence of an N95 nor the type of passage had a statistically significant impact on the error rate. CONCLUSION: CART should be used to augment communication with patients who are hard of hearing. If CART is not available, a STT application such as Ava 24/7 or the native iPhone dictation application may be considered, even in the context of medical terminology.
Cochlear implantation and simultaneous posterior semicircular canal plugging.
Nami Saber C, West N, Foghsgaard S … +1 more , Cayé-Thomasen P
Cochlear Implants Int · 2022 Nov · PMID 36065491 · Publisher ↗
BACKGROUND: Intractable benign paroxysmal positional vertigo (BPPV) may be treated by plugging the affected semicircular canal (SCC). A cochlear implant (CI) can diminish subjective symptoms of tinnitus. We present a cas...
BACKGROUND: Intractable benign paroxysmal positional vertigo (BPPV) may be treated by plugging the affected semicircular canal (SCC). A cochlear implant (CI) can diminish subjective symptoms of tinnitus. We present a case with intractable BPPV and incapacitating tinnitus who underwent surgery, simultaneously plugging his posterior SCC (PSCC) and implanting an ipsilateral CI. CASE: A 50-year-old male experienced single-sided deafness (SSD) with severe ipsilateral tinnitus, and intractable BPPV related to the ipsilateral PSCC. Two years earlier, he had been treated with a bone anchored hearing system (BAHS) for his single-sided hearing loss, but his tinnitus and BPPV persisted. The patient was elected for surgical plugging of the affected SCC and was offered a simultaneous ipsilateral CI to treat his hearing loss and reduce his disabling tinnitus. The procedure was initially clinically and subjectively successful, but the tinnitus worsened, following an MRI despite regular precautions. CONCLUSION: This is the first case presentation of cochlear implantation performed concurrent to plugging of the ipsilateral PSCC. The outcome of the procedure was overall successful.
Cochlear implant outcomes in patients with Meniere's disease: a large case series.
Kanona H, Forde C, Van Rooyen AM … +9 more , Keating P, Bradley J, Pendolino AL, Mehta N, Manjaly JG, Khalil S, Lavy J, Saeed SR, Shaida A
Cochlear Implants Int · 2022 Nov · PMID 36050279 · Publisher ↗
OBJECTIVE: To perform a matched cohort study to assess whether patients with Meniere's Disease (MD) require more intensive auditory rehabilitation following cochlear implantation (CI) and identify factors that may affect...
OBJECTIVE: To perform a matched cohort study to assess whether patients with Meniere's Disease (MD) require more intensive auditory rehabilitation following cochlear implantation (CI) and identify factors that may affect outcomes in patients with MD. METHODS: A retrospective case review was performed. MD and control patients were matched for age, biological sex, implant manufacturer and electrode design. Outcomes measured were speech scores, number of visits to audiology department following switch-on, and post-operative active MD. RESULTS: Forty consecutive implanted MD patients were identified between May 1993 and May 2019. Patients with active MD following CI required significantly more visits to the audiology department compared to controls (P < 0.01) and patients who had inactive MD post-operatively (P < 0.01). However, in MD patients, active MD was less likely following CI (P = 0.03). In patients who continued to experience active MD post-operatively, further medical and surgical ablative intervention was required to control ongoing Meniere's attacks. CONCLUSION: We present the largest case series of performance outcomes in CI patients with MD. Although speech outcomes in MD patients are comparable to controls, patients with active MD pre-operatively are more likely to experience variation in CI performance requiring a prolonged period of auditory rehabilitation compared to inactive preoperative MD.
The case for intra-operative X-ray in cochlear implantation: Four illustrative cases and literature review.
Yu C, Debs S, Singh R … +3 more , Kastetter S, Pierre-Louis A, Coelho DH
Cochlear Implants Int · 2022 Nov · PMID 36005270 · Publisher ↗
OBJECTIVES: To demonstrate the utility of routine intraoperative plain film imaging in optimizing outcomes in cochlear implantation. INTRODUCTION: Evolving surgical techniques, programming, and electrode arrays have all...
OBJECTIVES: To demonstrate the utility of routine intraoperative plain film imaging in optimizing outcomes in cochlear implantation. INTRODUCTION: Evolving surgical techniques, programming, and electrode arrays have all improved performance outcomes in cochlear implantation. Yet despite decreasing complication rates, electrode misplacement remains a common occurrence. Utilization of intraoperative confirmational tools (radiologic, electrophysiologic) remains unstandardized despite the acknowledged importance of proper electrode positioning. The purpose of this article is to illustrate the use and benefits of intraoperative X-ray (IOXR) in four cases, particularly in cases of normal electrophysiologic testing. METHODS: Four cases performed by an experienced CI surgeon are discussed where electrode malposition was only detected through X-ray. Literature review was performed on the use of intraoperative imaging, focusing on plain film radiography. RESULTS: Case 1-3 describe examples of resistance-free electrode insertion in patients with normal pre-operative imaging. Intraoperative impedances and neural response telemetry (NRT) were normal. However, IOXR ultimately revealed tip fold-over prompting array repositioning. Case 4 describes an elective replacement of a soft-failing device. Resistance was encountered during array insertion, with IOXR demonstrating incomplete insertion compared with prior imaging. Positioning was revised to achieve pre-revision insertion depth, demonstrating the utility of prior IOXR in revision cases. Literature review of IOXR is discussed. CONCLUSION: Appropriate placement of the electrode is paramount to successful CI outcomes. These cases illustrate IOXR as a safe, effective method to ensure optimal placement even in cases of normal electrophysiologic testing, supporting its routine use even by the most seasoned surgeons.
Arabic phoneme-grapheme correspondence by non-native, deaf children with cochlear implants and normal hearing children.
Anis FN, Umat C, Ahmad K … +1 more , Abdul Hamid B
Cochlear Implants Int · 2022 Nov · PMID 36005236 · Publisher ↗
OBJECTIVE: This study aimed to compare the error patterns of Arabic phoneme-grapheme correspondence by a group of Malay children with cochlear implants (CIs) and normal hearing (NH) and the effects of the visual graphica...
OBJECTIVE: This study aimed to compare the error patterns of Arabic phoneme-grapheme correspondence by a group of Malay children with cochlear implants (CIs) and normal hearing (NH) and the effects of the visual graphical features of Arabic graphemes (no-dot, single-dot, and multiple-dots) on the phoneme-grapheme correspondence. METHODS: Participants were matched for hearing age (Mean, M = 7 ± 1.03 years) and duration of exposure to Arabic sounds (M = 2.7 ± 1.2 years). All 28 Arabic phonemes were presented through a loudspeaker and participants pointed to the graphemes associated with the presented phonemes. RESULTS: A total of 336 and 616 tokens were collected for six children with CI and 11 NH children for each task, i.e., phonemes repetition and phoneme-grapheme correspondence. Both groups found it easier to repeat phonemes than the phoneme-grapheme correspondence. The children with CIs showed more confusion ([ظ, ز, ذ, ض, خ, ب, ه, س, ع, & ث] >10% correct scores) in phoneme-grapheme correspondence than the NH children ([ظ:14%] and [ث: 27%]). There was a significant interaction ( = 0.001) among the three visual graphical features and hearing status (CI and NH). CONCLUSION: Our results infer that non-native Malay children with CIs and NH use different strategies to process the Arabic graphemes' visual features for phoneme-grapheme correspondence.
Mechanically evoked tinnitus after cochlear implantation with preservation of residual hearing.
Vankatova L, Hsieh JW, Daskalou D … +1 more , Senn P
Cochlear Implants Int · 2022 Nov · PMID 35997295 · Publisher ↗
In the recent past, inclusion criteria for cochlear implant surgery expanded to patients with ever more residual acoustic hearing in the low frequencies. By applying the meticulous hearing preservation surgical strategy...
In the recent past, inclusion criteria for cochlear implant surgery expanded to patients with ever more residual acoustic hearing in the low frequencies. By applying the meticulous hearing preservation surgical strategy and specifically designed atraumatic electrode arrays, residual hearing can be preserved to a meaningful extent in a large majority of patients. In this paper, we describe two female patients suffering from mechanically evoked tinnitus after hearing preservation cochlear implantation surgery with MEDEL flex electrodes. The occurrence of audible perceptions through mechanical stimulation in the region of the external ear is believed to be due to the direct transmission of movements via the electrode array to the basilar membrane of the inner ear. In both cases, the mechanically evoked tinnitus led to revision surgery with immobilization of the array in the mastoid cavity. Despite eliminating the tinnitus, the revision surgery led to a loss of residual hearing in one patient, whereas the relatively poor residual hearing in the other revision case remained unchanged. The presence of mechanically evoked tinnitus seems to be associated with increased fragility of inner ear structures and hearing function, possibly due to direct mechanical contact of the electrode array with the basilar membrane. Consequently, the electrode array needs to be carefully immobilized in the mastoid cavity at a distance from soft tissue to prevent mechanical damage of inner ear structures, particularly in female patients with fine muscular tissue.
Parameter tuning of time-frequency masking algorithms for reverberant artifact removal within the cochlear implant stimulus.
Shahidi LK, Collins LM, Mainsah BO
Cochlear Implants Int · 2022 Nov · PMID 35875863 · Full text
Cochlear implant recipients struggle to understand speech in reverberant environments. To restore speech perception, artifacts due to reverberant reflections can be removed from the cochlear implant stimulus by applying...
Cochlear implant recipients struggle to understand speech in reverberant environments. To restore speech perception, artifacts due to reverberant reflections can be removed from the cochlear implant stimulus by applying a matrix of gain values, a technique referred to as . In this study, two common time-frequency masking strategies are implemented within cochlear implant processing, either introducing complete retention or deletion of stimulus components using a binary mask or continuous attenuation of stimulus components using a ratio mask. Parameters of each masking strategy control the level of attenuation imposed by the gain values. In this study, we perceptually tune the parameters of the masking strategy to determine a balance between speech retention and artifact removal. We measure the intelligibility of reverberant signals mitigated by each strategy with speech recognition testing in normal-hearing listeners using vocoding as a simulation of cochlear implant perception. For both masking strategies, we find parameterizations that maximize the intelligibility of the mitigated signals. At the best-performing parameterizations, binary-masked reverberant signals yield larger intelligibility improvements than ratio-masked signals. The results provide a perceptually optimized objective for the removal of reverberant artifacts from cochlear implant stimuli, facilitating improved speech recognition performance for cochlear implant recipients in reverberant environments.
Difference in cochlear length between male and female patients.
Baguant A, Cole A, Vilotitch A … +2 more , Quatre R, Schmerber S
Cochlear Implants Int · 2022 Nov · PMID 35860840 · Publisher ↗
To compare cochlear duct length (CDL) between male and female patients by evaluating the diameter of the basal turn (distance A) on CT scans. All temporal bone CT scans performed between 2014 and 2020 were reviewed in ou...
To compare cochlear duct length (CDL) between male and female patients by evaluating the diameter of the basal turn (distance A) on CT scans. All temporal bone CT scans performed between 2014 and 2020 were reviewed in our medical center. Using multiplanar reconstructions, the length A, which is the greatest distance of the basal turn was measured on both sides. We performed an analysis of variance considering two factors: sex and side. Two different physicians carried out the measurements, an otolaryngologist and a neuroradiologist. The patients who had several CT scans allowed us to evaluate the reliability of our procedure. Among the 888 CT scans reviewed, 8 were excluded because of cochlear malformations. The inter-sex difference of length A was found to be 0.29 millimeters(mm) 95% IC [0.26-0.34] and was longer in the male group ( < 0.0001). Using Alexiades' equation, we found that CDL was 34.5mm [34.37-34.61] in the male group and 33.3mm [33.13-33.38] in the female group. When one side was compared to the other, there was no significant difference ( = 0.226). An intra-class correlation found a good absolute agreement between the two screeners of 0.79. Males have a statistically significant longer CDL than females.
Classification of cochlear implant complications using a modified Clavien-Dindo classification.
Benoiton LA, MacLachlan AL, Mustard J … +2 more , Jayawardana J, Bird P
Cochlear Implants Int · 2022 Nov · PMID 35818635 · Publisher ↗
OBJECTIVES: Cochlear implantation (CI) surgery is a highly effective procedure for severe to profound hearing loss, with a low complication rate. There are currently multiple grading systems for CI surgery complications,...
OBJECTIVES: Cochlear implantation (CI) surgery is a highly effective procedure for severe to profound hearing loss, with a low complication rate. There are currently multiple grading systems for CI surgery complications, making comparison of outcomes difficult. We propose a modification to the Clavien-Dindo classification of complications, and use this modified classification to analyse our complications. METHODS: Complications were classified as: I - Self-limiting complications requiring no treatment or simple pharmacological therapies; II - Complications requiring pharmacological interventions other than those permitted under the criteria for Grade I, or non-invasive radiological imaging; IIIa - Complications necessitating surgical, radiological or endoscopic intervention, but excluding implant explantation and/or reimplantation. IIIb - Complications necessitating implant explantation and/or reimplantation. RESULTS: 1053 patients were recorded as having had at least one cochlear implant inserted with 114 complications reported in 90 patients. The 114 complications were classified into the proposed classification with 18 (15.7%) as Grade I, 36 (31.5%) as Grade II, 17 (14.9%) as Grade IIIa and 43 (34.2%) as Grade IIIb. DISCUSSION: We found a low complication rate, and were able to use the modified Clavien-Dindo classification system to analyse our data. We would strongly advocate for a uniform reporting system and propose this modification of a widely used system.
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