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Wang K, Gjini EK, Kooper-Johnson S, Cooper MI, Gallant C, Noonan KY. Cochlear Implant Outcomes in Patients with Intralabyrinthine Schwannoma: A Scoping Review. Laryngoscope 2024; 134:3910-3920. [PMID: 38554009 DOI: 10.1002/lary.31422] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2023] [Revised: 02/28/2024] [Accepted: 03/04/2024] [Indexed: 08/09/2024]
Abstract
OBJECTIVE To evaluate the literature and summarize cochlear implantation (CI) outcomes after intralabyrinthine schwannoma (ILS) excision and tumor observation with CI. DATA SOURCES OVID Medline, Embase, Web of Science; conception to 2024. REVIEW METHODS A literature review was performed using subject headings, MeSH terms, and keywords. Abstracts and full texts were reviewed by two independent reviewers and adjudicated by a third. Inclusion criteria included studies with ILS and CI with reported audiologic outcomes. Subjects were analyzed into two groups, ILS resection with CI and in situ ILS with CI. Patients with NF2 were included. The main outcome of interest was CI audiometric performance level, with secondary outcomes of CI user status and open-set speech attainment. RESULTS There were 29 articles with a total of 93 patients who met inclusion criteria. The resection group had 17% low performers, 44% intermediate performers, and 38% high performers. The in situ group had 40% low performers, 32% intermediate performers, 27% high performers. The resection group had 69 patients with 97% maintaining user status and 92% with open-set speech recognition. The observation group had 24 patients, with 87% user rate and 86% achieving open-set speech recognition. There was a greater percentage of NF2 diagnosis seen in the in situ group. CONCLUSION There is a paucity of literature on CI and ILS. Patients are managed with both resection of tumor and implantation in situ. Early data are limited, with improvement in hearing outcomes and high user rates in both populations. LEVEL OF EVIDENCE N/A Laryngoscope, 134:3910-3920, 2024.
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Affiliation(s)
- Katherine Wang
- Tufts University School of Medicine, Boston, Massachusetts, U.S.A
| | - Emily K Gjini
- Department of Otolaryngology, Tufts Medical Center, Boston, Massachusetts, U.S.A
| | | | - Michael I Cooper
- Tufts University School of Medicine, Boston, Massachusetts, U.S.A
| | - Collyn Gallant
- Department of Otolaryngology, Tufts Medical Center, Boston, Massachusetts, U.S.A
| | - Kathryn Y Noonan
- Tufts University School of Medicine, Boston, Massachusetts, U.S.A
- Department of Otolaryngology, Tufts Medical Center, Boston, Massachusetts, U.S.A
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Harris MS, Koka K, Thompson-Harvey A, Harvey E, Riggs WJ, Saleh S, Holder JT, Dwyer RT, Prentiss SM, Lefler SM, Kozlowski K, Hiss MM, Ortmann AJ, Nelson-Bakkum ER, Büchner A, Salcher R, Harvey SA, Hoffer ME, Bohorquez JE, Alzhrani F, Alshihri R, Almuhawas F, Danner CJ, Friedland DR, Seidman MD, Lenarz T, Telischi FF, Labadie RF, Buchman CA, Adunka OF. Amplitude Parameters Are Predictive of Hearing Preservation in a Randomized Controlled Trial of Intracochlear Electrocochleography During Cochlear Implant Surgery. Otol Neurotol 2024; 45:887-894. [PMID: 39052893 DOI: 10.1097/mao.0000000000004286] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/27/2024]
Abstract
OBJECTIVE To prospectively evaluate the association between hearing preservation after cochlear implantation (CI) and intracochlear electrocochleography (ECochG) amplitude parameters. STUDY DESIGN Multi-institutional, prospective randomized clinical trial. SETTING Ten high-volume, tertiary care CI centers. PATIENTS Adults (n = 87) with sensorineural hearing loss meeting CI criteria (2018-2021) with audiometric thresholds of ≤80 dB HL at 500 Hz. METHODS Participants were randomized to CI surgery with or without audible ECochG monitoring. Electrode arrays were inserted to the full-depth marker. Hearing preservation was determined by comparing pre-CI, unaided low-frequency (125-, 250-, and 500-Hz) pure-tone average (LF-PTA) to LF-PTA at CI activation. Three ECochG amplitude parameters were analyzed: 1) insertion track patterns, 2) magnitude of ECochG amplitude change, and 3) total number of ECochG amplitude drops. RESULTS The Type CC insertion track pattern, representing corrected drops in ECochG amplitude, was seen in 76% of cases with ECochG "on," compared with 24% of cases with ECochG "off" ( p = 0.003). The magnitude of ECochG signal drop was significantly correlated with the amount of LF-PTA change pre-CI and post-CI ( p < 0.05). The mean number of amplitude drops during electrode insertion was significantly correlated with change in LF-PTA at activation and 3 months post-CI ( p ≤ 0.01). CONCLUSIONS ECochG amplitude parameters during CI surgery have important prognostic utility. Higher incidence of Type CC in ECochG "on" suggests that monitoring may be useful for surgeons in order to recover the ECochG signal and preventing potentially traumatic electrode-cochlear interactions.
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Affiliation(s)
- Michael S Harris
- Department of Otolaryngology & Communication Sciences, Medical College of Wisconsin, Milwaukee, Wisconsin
| | - Kanth Koka
- Advanced Bionics, LLC Valencia, California
| | - Adam Thompson-Harvey
- Department of Otolaryngology & Communication Sciences, Medical College of Wisconsin, Milwaukee, Wisconsin
| | - Erin Harvey
- Department of Otolaryngology & Communication Sciences, Medical College of Wisconsin, Milwaukee, Wisconsin
| | - William J Riggs
- Department of Otolaryngology-Head & Neck Surgery, The Ohio State University, Wexner Medical Center, Columbus, Ohio
| | - Shaza Saleh
- King Saud University, College of Medicine, King Abdullah Ear Specialist Center (KAESC), Riyadh, Saudi Arabia
| | - Jordan T Holder
- Department of Hearing and Speech Sciences, Vanderbilt Bill Wilkerson Center, Vanderbilt University Medical Center, Nashville, Tennessee
| | | | - Sandra M Prentiss
- Department of Otolaryngology-Head & Neck Surgery, Miller School of Medicine, University of Miami, Miami, Florida
| | - Shannon M Lefler
- Department of Otolaryngology-Head & Neck Surgery, Washington University School of Medicine, St. Louis, Missouri
| | - Kristin Kozlowski
- Department of Otolaryngology & Communication Sciences, Medical College of Wisconsin, Milwaukee, Wisconsin
| | - Meghan M Hiss
- Department of Otolaryngology-Head & Neck Surgery, The Ohio State University, Wexner Medical Center, Columbus, Ohio
| | - Amanda J Ortmann
- Department of Otolaryngology-Head & Neck Surgery, Washington University School of Medicine, St. Louis, Missouri
| | | | | | - Rolf Salcher
- Medizinische Hochschule Hannover, Hannover, Germany
| | - Steven A Harvey
- Department of Otolaryngology & Communication Sciences, Medical College of Wisconsin, Milwaukee, Wisconsin
| | - Michael E Hoffer
- Department of Otolaryngology-Head & Neck Surgery, Miller School of Medicine, University of Miami, Miami, Florida
| | - Jorge E Bohorquez
- Department of Biomedical Engineering, University of Miami, Miami, Florida
| | - Farid Alzhrani
- King Saud University, College of Medicine, King Abdullah Ear Specialist Center (KAESC), Riyadh, Saudi Arabia
| | - Rana Alshihri
- King Saud University, College of Medicine, King Abdullah Ear Specialist Center (KAESC), Riyadh, Saudi Arabia
| | - Fida Almuhawas
- King Saud University, College of Medicine, King Abdullah Ear Specialist Center (KAESC), Riyadh, Saudi Arabia
| | | | - David R Friedland
- Department of Otolaryngology & Communication Sciences, Medical College of Wisconsin, Milwaukee, Wisconsin
| | | | | | - Fred F Telischi
- Department of Otolaryngology-Head & Neck Surgery, Miller School of Medicine, University of Miami, Miami, Florida
| | - Robert F Labadie
- Department of Otolaryngology-Head & Neck Surgery, Medical University of South Carolina, Charleston, South Carolina
| | - Craig A Buchman
- Department of Otolaryngology-Head & Neck Surgery, Washington University School of Medicine, St. Louis, Missouri
| | - Oliver F Adunka
- Department of Otolaryngology-Head & Neck Surgery, The Ohio State University, Wexner Medical Center, Columbus, Ohio
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3
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Reiss LAJ, Lawrence MB, Omelchenko IA, He W, Kirk JR. Chronic Electro-Acoustic Stimulation May Interfere With Electric Threshold Recovery After Cochlear Implantation in the Aged Guinea Pig. Ear Hear 2024:00003446-990000000-00310. [PMID: 38992863 DOI: 10.1097/aud.0000000000001545] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/13/2024]
Abstract
OBJECTIVES Electro-acoustic stimulation (EAS) combines electric stimulation via a cochlear implant (CI) with residual low-frequency acoustic hearing, with benefits for music appreciation and speech perception in noise. However, many EAS CI users lose residual acoustic hearing, reducing this benefit. The main objectives of this study were to determine whether chronic EAS leads to more hearing loss compared with CI surgery alone in an aged guinea pig model, and to assess the relationship of any hearing loss to histology measures. Conversely, it is also important to understand factors impacting efficacy of electric stimulation. If one contributor to CI-induced hearing loss is damage to the auditory nerve, both acoustic and electric thresholds will be affected. Excitotoxicity from EAS may also affect electric thresholds, while electric stimulation is osteogenic and may increase electrode impedances. Hence, secondary objectives were to assess how electric thresholds are related to the amount of residual hearing loss after CI surgery, and how EAS affects electric thresholds and impedances over time. DESIGN Two groups of guinea pigs, aged 9 to 21 months, were implanted with a CI in the left ear. Preoperatively, the animals had a range of hearing losses, as expected for an aged cohort. At 4 weeks after surgery, the EAS group (n = 5) received chronic EAS for 8 hours a day, 5 days a week, for 20 weeks via a tether system that allowed for free movement during stimulation. The nonstimulated group (NS; n = 6) received no EAS over the same timeframe. Auditory brainstem responses (ABRs) and electrically evoked ABRs (EABRs) were recorded at 3 to 4 week intervals to assess changes in acoustic and electric thresholds over time. At 24 weeks after surgery, cochlear tissue was harvested for histological evaluation, only analyzing animals without electrode extrusions (n = 4 per ear). RESULTS Cochlear implantation led to an immediate worsening of ABR thresholds peaking between 3 and 5 weeks after surgery and then recovering and stabilizing by 5 and 8 weeks. Significantly greater ABR threshold shifts were seen in the implanted ears compared with contralateral, non-implanted control ears after surgery. After EAS and termination, no significant additional ABR threshold shifts were seen in the EAS group compared with the NS group. A surprising finding was that NS animals had significantly greater recovery in EABR thresholds over time, with decreases (improvements) of -51.8 ± 33.0 and -39.0 ± 37.3 c.u. at 12 and 24 weeks, respectively, compared with EAS animals with EABR threshold increases (worsening) of +1.0 ± 25.6 and 12.8 ± 44.3 c.u. at 12 and 24 weeks. Impedance changes over time did not differ significantly between groups. After exclusion of cases with electrode extrusion or significant trauma, no significant correlations were seen between ABR and EABR thresholds, or between ABR thresholds with histology measures of inner/outer hair cell counts, synaptic ribbon counts, stria vascularis capillary diameters, or spiral ganglion cell density. CONCLUSIONS The findings do not indicate that EAS significantly disrupts acoustic hearing, although the small sample size limits this interpretation. No evidence of associations between hair cell, synaptic ribbon, spiral ganglion cell, or stria vascularis with hearing loss after cochlear implantation was seen when surgical trauma is minimized. In cases of major trauma, both acoustic thresholds and electric thresholds were elevated, which may explain why CI-only outcomes are often better when trauma and hearing loss are minimized. Surprisingly, chronic EAS (or electric stimulation alone) may negatively impact electric thresholds, possibly by prevention of recovery of the auditory nerve after CI surgery. More research is needed to confirm the potentially negative impact of chronic EAS on electric threshold recovery.
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Affiliation(s)
- Lina A J Reiss
- Department of Otolaryngology-Head and Neck Surgery, Oregon Health & Science University, Portland, Oregon, USA
| | - Melissa B Lawrence
- Department of Otolaryngology-Head and Neck Surgery, Oregon Health & Science University, Portland, Oregon, USA
| | - Irina A Omelchenko
- Department of Otolaryngology-Head and Neck Surgery, Oregon Health & Science University, Portland, Oregon, USA
| | - Wenxuan He
- Department of Otolaryngology-Head and Neck Surgery, Oregon Health & Science University, Portland, Oregon, USA
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Hosoya M, Kurihara S, Koyama H, Komune N. Recent advances in Otology: Current landscape and future direction. Auris Nasus Larynx 2024; 51:605-616. [PMID: 38552424 DOI: 10.1016/j.anl.2024.02.009] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2023] [Revised: 11/24/2023] [Accepted: 02/21/2024] [Indexed: 05/12/2024]
Abstract
Hearing is an essential sensation, and its deterioration leads to a significant decrease in the quality of life. Thus, great efforts have been made by otologists to preserve and recover hearing. Our knowledge regarding the field of otology has progressed with advances in technology, and otologists have sought to develop novel approaches in the field of otologic surgery to achieve higher hearing recovery or preservation rates. This requires knowledge regarding the anatomy of the temporal bone and the physiology of hearing. Basic research in the field of otology has progressed with advances in molecular biology and genetics. This review summarizes the current views and recent advances in the field of otology and otologic surgery, especially from the viewpoint of young Japanese clinician-scientists, and presents the perspectives and future directions for several topics in the field of otology. This review will aid next-generation researchers in understanding the recent advances and future challenges in the field of otology.
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Affiliation(s)
- Makoto Hosoya
- Department of Otolaryngology, Head and Neck Surgery, Keio University School of Medicine, Shinanomachi 35, Shinjuku-ku, Tokyo, 160-8582, Japan.
| | - Sho Kurihara
- Department of Otorhinolaryngology, The Jikei University School of Medicine, 3-25-8 Nishishimbashi Minato-ku, Tokyo, 105-8471, Japan
| | - Hajime Koyama
- Department of Otolaryngology and Head and Neck Surgery, Graduate School of Medicine, The University of Tokyo, Tokyo, 113-8654, Japan
| | - Noritaka Komune
- Department of Otorhinolaryngology, Graduate School of Medical Sciences, Kyushu University, 3-1-1Maidashi Higashi-ku, Fukuoka 812-8582, Japan
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Claussen AD, Kocharyan A, Bennion DM, Kashani R, Gantz BJ, Hansen MR. Robotics-Assisted Cochlear Implant Insertion. Otol Neurotol 2024; 45:e459. [PMID: 38728567 PMCID: PMC11090454 DOI: 10.1097/mao.0000000000004187] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/12/2024]
Abstract
The degree of intracochlear trauma and force associated with manual electrode insertion may negatively impact cochlear implant (CI) outcomes and preservation of residual acoustic hearing1 ,2 . Robotics-assisted CI insertion systems have recently been developed to overcome human kinematic constraints associated with manual surgical techniques to allow lower force and slower electrode insertions, with the goal of improving performance and hearing preservation outcomes. The iotaSOFT™ (iotaMotion Inc., USA) is an FDA approved robotics-assisted CI insertion tool compatible with modern lateral-wall electrode designs. Pre-clinical studies suggest lower force and less traumatic CI insertions are possible with this system compared to manual insertion techniques3 ,4 . The slower insertion speeds of this system allow more precise control of electrode insertion in response to simultaneous electrocochleography feedback. We demonstrate application of this system with concurrent electrocochleography for hearing preservation cochlear implantation and highlight relevant surgical technique (see Video, Supplemental Digital Content 1 , which demonstrates robotics-assisted CI insertion).
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Affiliation(s)
| | - Armine Kocharyan
- Department of Otolaryngology Head & Neck Surgery, University of Iowa, Iowa City, IA
| | - Doug M. Bennion
- Department of Otolaryngology Head & Neck Surgery, University of Iowa, Iowa City, IA
| | - Rustin Kashani
- Department of Otolaryngology Head & Neck Surgery, University of Iowa, Iowa City, IA
| | - Bruce J. Gantz
- Department of Otolaryngology Head & Neck Surgery, University of Iowa, Iowa City, IA
| | - Marlan R. Hansen
- Department of Otolaryngology Head & Neck Surgery, University of Iowa, Iowa City, IA
- iotaMotion, Inc., Iowa City, IA
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Peel A, Bennion D, Horne R, Hansen MR, Guymon CA. Photografted Zwitterionic Hydrogel Coating Durability for Reduced Foreign Body Response to Cochlear Implants. ACS APPLIED BIO MATERIALS 2024; 7:3124-3135. [PMID: 38584364 PMCID: PMC11110053 DOI: 10.1021/acsabm.4c00156] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2024] [Revised: 03/21/2024] [Accepted: 03/22/2024] [Indexed: 04/09/2024]
Abstract
The durability of photografted zwitterionic hydrogel coatings on cochlear implant biomaterials was examined to determine the viability of these antifouling surfaces during insertion and long-term implant usage. Tribometry was used to determine the effect of zwitterionic coatings on the lubricity of surfaces with varying hydration levels, applied normal force, and time frame. Additionally, flexural resistance was investigated using mandrel bending. Ex vivo durability was assessed by determining the coefficient of friction between tissues and treated surfaces. Furthermore, cochlear implantation force was measured using cadaveric human cochleae. Hydrated zwitterionic hydrogel coatings reduced frictional resistance approximately 20-fold compared to uncoated PDMS, which led to significantly lower mean force experienced by coated cochlear implants during insertion compared to uncoated systems. Under flexural force, zwitterionic films resisted failure for up to 60 min of desiccation. The large increase in lubricity was maintained for 20 h under continual force while hydrated. For loosely cross-linked systems, films remained stable and lubricious even after rehydration following complete drying. All coatings remained hydrated and functional under frictional force for at least 30 min in ambient conditions allowing drying, with lower cross-link densities showing the greatest longevity. Moreover, photografted zwitterionic hydrogel samples showed no evidence of degradation and nearly identical lubricity before and after implantation. This work demonstrates that photografted zwitterionic hydrogel coatings are sufficiently durable to maintain viability before, during, and after implantation. Mechanical properties, including greatly increased lubricity, are preserved after complete drying and rehydration for various applied forces. Additionally, this significantly enhanced lubricity translates to significantly decreased force during insertion of implants which should result in less trauma and scarring.
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Affiliation(s)
- Adreann Peel
- Department
of Chemical and Biochemical Engineering, University of Iowa, Iowa City, Iowa 52242, United States
| | - Douglas Bennion
- Department
of Otolaryngology-Head and Neck Surgery, University of Iowa, Iowa City, Iowa 52242, United States
| | - Ryan Horne
- Department
of Chemical and Biochemical Engineering, University of Iowa, Iowa City, Iowa 52242, United States
| | - Marlan R. Hansen
- Department
of Otolaryngology-Head and Neck Surgery, University of Iowa, Iowa City, Iowa 52242, United States
| | - C. Allan Guymon
- Department
of Chemical and Biochemical Engineering, University of Iowa, Iowa City, Iowa 52242, United States
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Varghese JJ, Walia A, Lefler SM, Ortmann AJ, Shew MA, Durakovic N, Wick CC, Herzog JA, Buchman CA. Identifying Slim Modiolar Electrode Tip Fold-Over With Intracochlear Electrocochleography. Otolaryngol Head Neck Surg 2024; 170:1124-1132. [PMID: 38018567 PMCID: PMC10960700 DOI: 10.1002/ohn.587] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2023] [Revised: 10/21/2023] [Accepted: 10/28/2023] [Indexed: 11/30/2023]
Abstract
OBJECTIVE To evaluate the predictive value of intracochlear electrocochleography (ECochG) for identifying tip fold-over during cochlear implantation (CI) using the slim modiolar electrode (SME) array. STUDY DESIGN Prospective cohort study. SETTING Tertiary referral center. METHODS From July 2022 to June 2023, 142 patients, including adults and children, underwent intracochlear ECochG monitoring during and after SME placement. Tone-bursts were presented from 250 Hz to 2 kHz at 108 to 114 dB HL. A fast Fourier transform (FFT) allowed for frequency-specific evaluation of ECochG response. ECochG patterns during insertion and postinsertion were evaluated using sensitivity and specificity analysis to predict tip fold-over. Intraoperative plain radiographs served as a reference standard. RESULTS Fifteen tip fold-over cases occurred (10.6%) with significant ECochG response (>2 µV). Sixty-one cases without tip fold-over occurred (43.0%) with significant ECochG response. All tip fold-overs had both a nontonotopic postinsertion sweep and nonrobust active insertion pattern. No patients with robust insertion or tonotopic sweep patterns had tip fold-over. Sensitivity of detecting tip fold-over when having both nonrobust insertion and nontonotopic sweep patterns was 100% (95% confidence inteval [CI] 78.2%-100%), specificity was 68.9% (95% CI 55.7%-80.1%), and the overall accuracy was 72.0% (95% CI 60.5%-81.7%). CONCLUSION Intracochlear ECochG monitoring during cochlear implantation with the SME can be a valuable tool for identifying properly positioned electrode arrays. In cases where ECochG patterns are nonrobust on insertion and nontonotopic for electrode sweeps, there may be a concern for tip fold-over, and intraoperative imaging is necessary to confirm proper insertion.
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Affiliation(s)
- Jordan J. Varghese
- Department of Otolaryngology – Head and Neck Surgery, Washington University School of Medicine, St. Louis, Missouri, USA
| | - Amit Walia
- Department of Otolaryngology – Head and Neck Surgery, Washington University School of Medicine, St. Louis, Missouri, USA
| | - Shannon M. Lefler
- Department of Otolaryngology – Head and Neck Surgery, Washington University School of Medicine, St. Louis, Missouri, USA
| | - Amanda J. Ortmann
- Department of Otolaryngology – Head and Neck Surgery, Washington University School of Medicine, St. Louis, Missouri, USA
| | - Matthew A. Shew
- Department of Otolaryngology – Head and Neck Surgery, Washington University School of Medicine, St. Louis, Missouri, USA
| | - Nedim Durakovic
- Department of Otolaryngology – Head and Neck Surgery, Washington University School of Medicine, St. Louis, Missouri, USA
| | - Cameron C. Wick
- Department of Otolaryngology – Head and Neck Surgery, Washington University School of Medicine, St. Louis, Missouri, USA
| | - Jacques A. Herzog
- Department of Otolaryngology – Head and Neck Surgery, Washington University School of Medicine, St. Louis, Missouri, USA
| | - Craig A. Buchman
- Department of Otolaryngology – Head and Neck Surgery, Washington University School of Medicine, St. Louis, Missouri, USA
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Geerardyn A, Zhu M, Verhaert N, Quesnel AM. Intracochlear Trauma and Local Ossification Patterns Differ Between Straight and Precurved Cochlear Implant Electrodes. Otol Neurotol 2024; 45:245-255. [PMID: 38270168 PMCID: PMC10922381 DOI: 10.1097/mao.0000000000004102] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2024]
Abstract
HYPOTHESIS Trauma to the osseous spiral lamina (OSL) or spiral ligament (SL) during cochlear implant (CI) insertion segregates with electrode type and induces localized intracochlear ossification and fibrosis. BACKGROUND The goal of atraumatic CI insertion is to preserve intracochlear structures, limit reactive intracochlear tissue formation, and preserve residual hearing. Previous qualitative studies hypothesized a localized effect of trauma on intracochlear tissue formation; however, quantitative studies failed to confirm this. METHODS Insertional trauma beyond the immediate insertion site was histologically assessed in 21 human temporal bones with a CI. Three-dimensional reconstructions were generated and virtually resectioned perpendicular to the cochlear spiral at high resolution. The cochlear volume occupied by ossification or fibrosis was determined at the midpoint of the trauma and compared with regions proximal and distal to this point. RESULTS Seven cases, all implanted with precurved electrodes, showed an OSL fracture beyond the immediate insertion site. Significantly more intracochlear ossification was observed at the midpoint of the OSL fracture, compared with the -26 to -18 degrees proximal and 28 to 56 degrees distal to the center. No such pattern was observed for fibrosis. In the 12 cases with a perforation of the SL (9 straight and 3 precurved electrodes), no localized pattern of ossification or fibrosis was observed around these perforations. CONCLUSION OSL fractures were observed exclusively with precurved electrodes in this study and may serve as a nidus for localized intracochlear ossification. Perforation of the SL, in contrast, predominantly occurred with straight electrodes and was not associated with localized ossification.
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Affiliation(s)
| | - MengYu Zhu
- Otopathology Laboratory, Massachusetts Eye and Ear, Boston, Massachusetts, USA
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Schaefer S, Sladen M, Nichani J, Millward K, Lockley M, O'Driscoll M, Kluk K, Bruce IA. Hearing preservation in paediatric cochlear implantation with the Nucleus Slim Straight Electrode - our experience. Int J Audiol 2024:1-8. [PMID: 38319187 DOI: 10.1080/14992027.2024.2306191] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2021] [Accepted: 01/11/2024] [Indexed: 02/07/2024]
Abstract
OBJECTIVE to evaluate the levels of successful hearing preservation and preservation of functional hearing following cochlear implantation (HPCI) in children using the Cochlear Nucleus® Slim Straight Electrode (SSE). DESIGN retrospective case note review of paediatric HPCI cases in our CI centre from 2013 to 2023. Inclusion criteria were attempted hearing preservation surgery, SSE used for implantation, pre-operative hearing thresholds ≤80dBHL at 250 Hz, CI before 18 years of age. Patients were excluded if no postoperative unaided PTA was obtained (poor attendance). Primairy outcome was hearing preservation using the HEARRING group formula; secondary outcome was residual functional hearing (≤80dBHL at 250 Hz/<90dB LFPTA). STUDY SAMPLE 56 patients with 94 CI's were included for review. RESULTS Hearing preservation was achieved in 94.7% (89/94) of ears and complete preservation in 72% (68/94)). Average functional hearing was preserved in 89% using both criteria for preservation. Long-term follow up data was available for 36 ears (average 35.2 months), demonstrating 88.9% (32/36) complete preservation. CONCLUSION We have reliably achieved and maintained a high success rate of HPCI using the SSE in our paediatric population. The field of HPCI would benefit from unification of outcome reporting in order to optimise the evidence available to professionals, patients and their carers.
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Affiliation(s)
- Simone Schaefer
- Department of Paediatric Otolaryngology, Royal Manchester Children's Hospital, Manchester University NHS Foundation Trust, Manchester, UK
| | - Mark Sladen
- Richard Ramsden Centre for Auditory Implants, Manchester University NHS Foundation Trust, Manchester Academic Health Science Centre, Manchester, UK
| | - Jaya Nichani
- Department of Paediatric Otolaryngology, Royal Manchester Children's Hospital, Manchester University NHS Foundation Trust, Manchester, UK
| | - Kerri Millward
- Richard Ramsden Centre for Auditory Implants, Manchester University NHS Foundation Trust, Manchester Academic Health Science Centre, Manchester, UK
| | - Morag Lockley
- Richard Ramsden Centre for Auditory Implants, Manchester University NHS Foundation Trust, Manchester Academic Health Science Centre, Manchester, UK
| | - Martin O'Driscoll
- Richard Ramsden Centre for Auditory Implants, Manchester University NHS Foundation Trust, Manchester Academic Health Science Centre, Manchester, UK
| | - Karolina Kluk
- Manchester Centre for Audiology and Deafness (ManCAD), Faculty of Biology, Medicine and Health, The University of Manchester, Manchester, UK
| | - Iain A Bruce
- Department of Paediatric Otolaryngology, Royal Manchester Children's Hospital, Manchester University NHS Foundation Trust, Manchester, UK
- Division of Infection, Immunity and Respiratory Medicine, Faculty of Biology, Medicine and Health, University of Manchester, Manchester, UK
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Kashani RG, Kocharyan A, Bennion DM, Scheperle RA, Etler C, Oleson J, Dunn CC, Claussen AD, Gantz BJ, Hansen MR. Combining Intraoperative Electrocochleography with Robotics-Assisted Electrode Array Insertion. Otol Neurotol 2024; 45:143-149. [PMID: 38206061 PMCID: PMC10786337 DOI: 10.1097/mao.0000000000004094] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2024]
Abstract
OBJECTIVE To describe the use of robotics-assisted electrode array (EA) insertion combined with intraoperative electrocochleography (ECochG) in hearing preservation cochlear implant surgery. STUDY DESIGN Prospective, single-arm, open-label study. SETTING All procedures and data collection were performed at a single tertiary referral center. PATIENTS Twenty-one postlingually deaf adult subjects meeting Food and Drug Administration indication criteria for cochlear implantation with residual acoustic hearing defined as thresholds no worse than 65 dB at 125, 250, and 500 Hz. INTERVENTION All patients underwent standard-of-care unilateral cochlear implant surgery using a single-use robotics-assisted EA insertion device and concurrent intraoperative ECochG. MAIN OUTCOME MEASURES Postoperative pure-tone average over 125, 250, and 500 Hz measured at initial activation and subsequent intervals up to 1 year afterward. RESULTS Twenty-two EAs were implanted with a single-use robotics-assisted insertion device and simultaneous intraoperative ECochG. Fine control over robotic insertion kinetics could be applied in response to changes in ECochG signal. Patients had stable pure-tone averages after activation with normal impedance and neural telemetry responses. CONCLUSIONS Combining robotics-assisted EA insertion with intraoperative ECochG is a feasible technique when performing hearing preservation implant surgery. This combined approach may provide the surgeon a means to overcome the limitations of manual insertion and respond to cochlear feedback in real-time.
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Affiliation(s)
- Rustin G. Kashani
- Department of Otolaryngology–Head and Neck Surgery, University of Iowa Hospitals and Clinics, Iowa City, Iowa
| | - Armine Kocharyan
- Department of Otolaryngology–Head and Neck Surgery, University of Iowa Hospitals and Clinics, Iowa City, Iowa
| | - Douglas M. Bennion
- Department of Otolaryngology–Head and Neck Surgery, University of Iowa Hospitals and Clinics, Iowa City, Iowa
| | - Rachel A. Scheperle
- Department of Otolaryngology–Head and Neck Surgery, University of Iowa Hospitals and Clinics, Iowa City, Iowa
| | - Christine Etler
- Department of Otolaryngology–Head and Neck Surgery, University of Iowa Hospitals and Clinics, Iowa City, Iowa
| | - Jacob Oleson
- Department of Otolaryngology–Head and Neck Surgery, University of Iowa Hospitals and Clinics, Iowa City, Iowa
| | - Camille C. Dunn
- Department of Otolaryngology–Head and Neck Surgery, University of Iowa Hospitals and Clinics, Iowa City, Iowa
| | - Alexander D. Claussen
- Department of Otolaryngology–Head and Neck Surgery, University of Iowa Hospitals and Clinics, Iowa City, Iowa
| | - Bruce J. Gantz
- Department of Otolaryngology–Head and Neck Surgery, University of Iowa Hospitals and Clinics, Iowa City, Iowa
| | - Marlan R. Hansen
- Department of Otolaryngology–Head and Neck Surgery, University of Iowa Hospitals and Clinics, Iowa City, Iowa
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11
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Kashani RG, Henslee A, Nelson RF, Hansen MR. Robotic assistance during cochlear implantation: the rationale for consistent, controlled speed of electrode array insertion. Front Neurol 2024; 15:1335994. [PMID: 38318440 PMCID: PMC10839068 DOI: 10.3389/fneur.2024.1335994] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2023] [Accepted: 01/05/2024] [Indexed: 02/07/2024] Open
Abstract
Cochlear implants (CI) have revolutionized the treatment of patients with severe to profound sensory hearing loss by providing a method of bypassing normal hearing to directly stimulate the auditory nerve. A further advance in the field has been the introduction of "hearing preservation" surgery, whereby the CI electrode array (EA) is carefully inserted to spare damage to the delicate anatomy and function of the cochlea. Preserving residual function of the inner ear allows patients to receive maximal benefit from the CI and to combine CI electric stimulation with acoustic hearing, offering improved postoperative speech, hearing, and quality of life outcomes. However, under the current paradigm of implant surgery, where EAs are inserted by hand, the cochlea cannot be reliably spared from damage. Robotics-assisted EA insertion is an emerging technology that may overcome fundamental human kinetic limitations that prevent consistency in achieving steady and slow EA insertion. This review begins by describing the relationship between EA insertion speed and generation of intracochlear forces and pressures. The various mechanisms by which these intracochlear forces can damage the cochlea and lead to worsened postoperative outcomes are discussed. The constraints of manual insertion technique are compared to robotics-assisted methods, followed by an overview of the current and future state of robotics-assisted EA insertion.
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Affiliation(s)
- Rustin G. Kashani
- Department of Otolaryngology – Head and Neck Surgery, University of Iowa Hospitals and Clinics, Iowa City, IA, United States
| | | | | | - Marlan R. Hansen
- Department of Otolaryngology – Head and Neck Surgery, University of Iowa Hospitals and Clinics, Iowa City, IA, United States
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Gerbert M, Ernst A, Seidl R, Decker L, Scholz S, Lauer G, Mittmann P. Preservation of Residual Hearing: Long-Term Results With a Mid-Scala Electrode. J Otolaryngol Head Neck Surg 2024; 53:19160216241250351. [PMID: 38888946 PMCID: PMC11155315 DOI: 10.1177/19160216241250351] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/29/2024] [Accepted: 03/30/2024] [Indexed: 06/20/2024] Open
Abstract
OBJECTIVE The long-term preservation of residual hearing after cochlear implantation has become a major goal over the past few years. The aim of the present study was to evaluate residual hearing in the long-term follow-up using mid-scala electrodes. METHODS In this retrospective, single-center study, we collected data from 27 patients who were implanted between 2014 and 2015 with residual hearing in the low-frequency range using a mid-scala electrode. Measurements of the hearing thresholds were carried out directly postoperatively (day 1 after surgery) and in the long-term follow-up 43.7 ± 6.9 months. The calculation of the extent of audiological hearing preservation was determined using the HEARRING group formula by Skarsynski. RESULTS Postoperative preservation of residual hearing was achieved in 69.2% of the cases in the low-frequency range between 250 Hz and 1 kHz, of which 89.5% of the patients had frequencies that suggested using electroacoustic stimulation (EAS). In the long-term follow-up, 30.8% of the patients showed residual hearing; however, 57.1% had apparently benefited from EAS. CONCLUSION Preservation of residual hearing is feasible in the long term using mid-scala electrodes. Postoperatively, there is over the half of patients who benefit from an EAS strategy. The long-term follow-up shows a certain decrease in residual hearing. However, these results are comparable to studies relating to other types of electrodes. Further research should be conducted in future to better evaluate hearing loss in long-term follow-up, compared to direct postoperative audiological results.
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Affiliation(s)
- Martin Gerbert
- Department of Otolaryngology, Head and Neck Surgery, Unfallkrankenhaus Berlin, Berlin, Germany
| | - Arne Ernst
- Department of Otolaryngology, Head and Neck Surgery, Unfallkrankenhaus Berlin, Berlin, Germany
| | - Rainer Seidl
- Department of Otolaryngology, Head and Neck Surgery, Unfallkrankenhaus Berlin, Berlin, Germany
| | - Lars Decker
- Department of Otolaryngology, Head and Neck Surgery, Unfallkrankenhaus Berlin, Berlin, Germany
| | - Sandra Scholz
- Department of Otolaryngology, Head and Neck Surgery, Unfallkrankenhaus Berlin, Berlin, Germany
| | - Gina Lauer
- Department of Otolaryngology, Head and Neck Surgery, Unfallkrankenhaus Berlin, Berlin, Germany
| | - Philipp Mittmann
- Department of Otolaryngology, Head and Neck Surgery, Unfallkrankenhaus Berlin, Berlin, Germany
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Mussoi BS, Meibos A, Woodson E, Sydlowski S. The association between electrode impedance and short-term outcomes in cochlear implant recipients of slim modiolar and slim straight electrode arrays. Cochlear Implants Int 2024; 25:59-68. [PMID: 38081181 DOI: 10.1080/14670100.2023.2290768] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/17/2024]
Abstract
OBJECTIVES Electrode impedance measurements from cochlear implants (CI) reflect the status of the electrode array as well as the surrounding cochlear environment, and could provide a clinical index of functional changes with the CI. The goals of this study were to examine (1) the impact of electrode array type on electrode impedance, and (2) the relationship between electrode impedance and short-term hearing preservation and speech recognition outcomes. METHODS Retrospective study of 115 adult hearing preservation CI recipients of a slim modiolar or slim straight array. Common ground electrode impedances, pre- and post-operative hearing thresholds and CNC word recognition scores were retrieved. RESULTS Electrode impedances were significantly higher for recipients of the straight electrode array. Within individuals, electrode impedances were stable after the first week post-activation. However, increased standard deviation of electrode impedances was associated with greater loss of low frequency hearing at initial activation, and with poorer speech recognition at 6 months post-implantation. CONCLUSIONS Results demonstrate that electrode impedances depend on the type of implanted array. Findings also suggest that there may be a role for the variability in electrode impedance across electrodes as an indicator of changes in the intracochlear environment that contribute to outcomes with a CI.
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Affiliation(s)
- Bruna S Mussoi
- Speech Pathology and Audiology, Kent State University, Kent, OH, USA
| | - Alex Meibos
- School of Speech-Language Pathology and Audiology, The University of Akron, Akron, OH, USA
| | - Erika Woodson
- Head and Neck Institute, Cleveland Clinic, Cleveland, OH, USA
| | - Sarah Sydlowski
- Head and Neck Institute, Cleveland Clinic, Cleveland, OH, USA
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14
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Kaul VF, Brannan Z, Keith J, Hittle B, Riggs W, Hiss M, Varadarajan V, Zhan K, Powell K, Wiet GJ, Adunka OF. Post-operative evaluation of computed tomography imaging following cochlear implantation. Am J Otolaryngol 2024; 45:104081. [PMID: 37820391 DOI: 10.1016/j.amjoto.2023.104081] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2023] [Accepted: 09/30/2023] [Indexed: 10/13/2023]
Abstract
PURPOSE This study utilized an automated segmentation algorithm to assess the cochlear implant electrode array within the cochlea and investigate its impact on audiologic outcomes as measured by post-operative speech perception scores. Furthermore, manual evaluations of electrode placement were compared to automatic segmentation methods to determine their accuracy in predicting post-operative audiologic outcomes. MATERIALS AND METHODS This retrospective chart review was conducted at a tertiary care referral center involving adult post-lingually deafened cochlear implant recipients implanted from 2015 to 2019. Patients with appropriate postoperative imaging and speech testing were included. Patients were excluded if non-English speaking, had a cognitive deficit, or a labyrinthine malformation. Automated and manual methods were used to analyze computed tomography (CT) scans and correlate the findings with post-operative speech perception scores and detection of electrode translocation. RESULTS Among the 47 patients who met inclusion criteria, 15 had electrode translocations confirmed by automatic segmentation methods. Controlling for CI usage and pre-operative AzBio scores, patients with translocation exhibited significantly lower consonant-nucleus consonant (CNC) and AzBio scores at 6-months post-implantation compared to patients with ST insertions. Moreover, the number of translocated electrode contacts was significantly associated with post-operative CNC scores. Manual evaluations of electrode location were predictive but less sensitive to electrode translocations when compared with automated 3D segmentation. CONCLUSIONS Placement of CI electrode contacts within ST without translocation into SV, leads to improved audiologic outcomes. Manual assessment of electrode placement via temporal bone CT, without 3D reconstruction, provides a less sensitive method to determine electrode placement than automated methods. LEVEL OF EVIDENCE Level 4. LAY SUMMARY This study investigated the impact of electrode placement on speech outcomes for cochlear implant recipients. Using advanced imaging techniques, the researchers compared automated and manual methods for evaluating electrode position and examined the relationship between electrode translocation and audiologic outcomes. The findings revealed that proper placement within the cochlea without translocation into inappropriate compartments inside the cochlea improves speech understanding. Manual evaluations were somewhat accurate but less sensitive in detecting translocations compared to automated methods, which offer more precise predictions of patient outcomes. These results contribute to our understanding of factors influencing cochlear implant success and highlight the importance of optimizing electrode placement for improved speech outcomes.
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Affiliation(s)
- Vivian F Kaul
- The Ohio State Wexner Medical Center, 915 Olentangy River Rd, Columbus, OH 43212, United States of America.
| | - Zachary Brannan
- The Ohio State University College of Medicine, 370 W 9th Ave, Columbus, OH 43210, United States of America
| | - Jason Keith
- Ohio State University College of Engineering, 2070 Neil Ave, Columbus, OH 43210, United States of America.
| | - Bradley Hittle
- The Ohio State University College of Medicine, 370 W 9th Ave, Columbus, OH 43210, United States of America.
| | - William Riggs
- The Ohio State Wexner Medical Center, 915 Olentangy River Rd, Columbus, OH 43212, United States of America
| | - Meghan Hiss
- The Ohio State Wexner Medical Center, 915 Olentangy River Rd, Columbus, OH 43212, United States of America.
| | - Varun Varadarajan
- Associates of Otolaryngology Colorado, 850 E Harvard Ave # 505, Denver, CO 80210, United States of America
| | - Kevin Zhan
- Northwestern Medical Group, 251 East Huron Street, Chicago, IL 60611, United States of America.
| | - Kimerly Powell
- The Ohio State Wexner Medical Center, 915 Olentangy River Rd, Columbus, OH 43212, United States of America.
| | - Gregory J Wiet
- The Ohio State Wexner Medical Center, 915 Olentangy River Rd, Columbus, OH 43212, United States of America; Nationwide Children's Hospital, 700 Children's Dr, Columbus, OH 43205, United States of America.
| | - Oliver F Adunka
- The Ohio State Wexner Medical Center, 915 Olentangy River Rd, Columbus, OH 43212, United States of America; Nationwide Children's Hospital, 700 Children's Dr, Columbus, OH 43205, United States of America.
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15
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Scheperle R, Etler C, Oleson J, Dunn C, Kashani R, Claussen A, Gantz BJ, Hansen MR. Evaluation of Real-Time Intracochlear Electrocochleography for Guiding Cochlear Implant Electrode Array Position. J Clin Med 2023; 12:7409. [PMID: 38068461 PMCID: PMC10707171 DOI: 10.3390/jcm12237409] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2023] [Revised: 11/12/2023] [Accepted: 11/24/2023] [Indexed: 02/12/2024] Open
Abstract
This study evaluates intracochlear electrocochleography (ECochG) for real-time monitoring during cochlear implantation. One aim tested whether adjusting the recording electrode site would help differentiate between atraumatic and traumatic ECochG amplitude decrements. A second aim assessed whether associations between ECochG amplitude decrements and post-operative hearing loss were weaker when considering hearing sensitivity at the ECochG stimulus frequency compared to a broader frequency range. Eleven adult cochlear implant recipients who were candidates for electro-acoustic stimulation participated. Single-frequency (500-Hz) ECochG was performed during cochlear implantation; the amplitude of the first harmonic of the difference waveform was considered. Post-operative hearing preservation at 500 Hz ranged from 0 to 94%. The expected relationship between ECochG amplitude decrements and hearing preservation was observed, though the trend was not statistically significant, and predictions were grossly inaccurate for two participants. Associations did not improve when considering alternative recording sites or hearing sensitivity two octaves above the ECochG stimulus frequency. Intracochlear location of a moving recording electrode is a known confound to real-time interpretation of ECochG amplitude fluctuations, which was illustrated by the strength of the correlation with ECochG amplitude decrements. Multiple factors contribute to ECochG amplitude patterns and to hearing preservation; these results highlight the confounding influence of intracochlear recording electrode location on the ECochG.
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Affiliation(s)
- Rachel Scheperle
- Department of Otolaryngology-Head and Neck Surgery, University of Iowa Hospitals and Clinics, Iowa City, IA 52242, USA; (C.E.); (C.D.); (R.K.); (A.C.); (B.J.G.); (M.R.H.)
| | - Christine Etler
- Department of Otolaryngology-Head and Neck Surgery, University of Iowa Hospitals and Clinics, Iowa City, IA 52242, USA; (C.E.); (C.D.); (R.K.); (A.C.); (B.J.G.); (M.R.H.)
| | - Jacob Oleson
- Department of Biostatistics, University of Iowa, Iowa City, IA 52242, USA
| | - Camille Dunn
- Department of Otolaryngology-Head and Neck Surgery, University of Iowa Hospitals and Clinics, Iowa City, IA 52242, USA; (C.E.); (C.D.); (R.K.); (A.C.); (B.J.G.); (M.R.H.)
| | - Rustin Kashani
- Department of Otolaryngology-Head and Neck Surgery, University of Iowa Hospitals and Clinics, Iowa City, IA 52242, USA; (C.E.); (C.D.); (R.K.); (A.C.); (B.J.G.); (M.R.H.)
- Department of Neurosurgery, University of Iowa Hospitals and Clinics, Iowa City, IA 52242, USA
| | - Alexander Claussen
- Department of Otolaryngology-Head and Neck Surgery, University of Iowa Hospitals and Clinics, Iowa City, IA 52242, USA; (C.E.); (C.D.); (R.K.); (A.C.); (B.J.G.); (M.R.H.)
- Department of Neurosurgery, University of Iowa Hospitals and Clinics, Iowa City, IA 52242, USA
| | - Bruce J. Gantz
- Department of Otolaryngology-Head and Neck Surgery, University of Iowa Hospitals and Clinics, Iowa City, IA 52242, USA; (C.E.); (C.D.); (R.K.); (A.C.); (B.J.G.); (M.R.H.)
- Department of Neurosurgery, University of Iowa Hospitals and Clinics, Iowa City, IA 52242, USA
| | - Marlan R. Hansen
- Department of Otolaryngology-Head and Neck Surgery, University of Iowa Hospitals and Clinics, Iowa City, IA 52242, USA; (C.E.); (C.D.); (R.K.); (A.C.); (B.J.G.); (M.R.H.)
- Department of Neurosurgery, University of Iowa Hospitals and Clinics, Iowa City, IA 52242, USA
- Department of Molecular Physiology and Biophysics, University of Iowa Hospitals and Clinics, Iowa City, IA 52242, USA
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16
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Andren KG, Duffin K, Ryan MT, Riley CA, Tolisano AM. Postoperative optimization of cochlear implantation for single sided deafness and asymmetric hearing loss: a systematic review. Cochlear Implants Int 2023; 24:342-353. [PMID: 37490782 DOI: 10.1080/14670100.2023.2239512] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/27/2023]
Abstract
OBJECTIVE Identify and evaluate the effectiveness of methods for improving postoperative cochlear implant (CI) hearing performance in subjects with single-sided deafness (SSD) and asymmetric hearing loss (AHL). DATA SOURCES Embase, PubMed, Scopus. REVIEW METHODS Systematic review and narrative synthesis. English language studies of adult CI recipients with SSD and AHL reporting a postoperative intervention and comparative audiometric data pertaining to speech in noise, speech in quiet and sound localization were included. RESULTS 32 studies met criteria for full text review and 6 (n = 81) met final inclusion criteria. Interventions were categorized as: formal auditory training, programming techniques, or hardware optimization. Formal auditory training (n = 10) found no objective improvement in hearing outcomes. Experimental CI maps did not improve audiologic outcomes (n = 9). Programed CI signal delays to improve synchronization demonstrated improved sound localization (n = 12). Hardware optimization, including multidirectional (n = 29) and remote (n = 11) microphones, improved sound localization and speech in noise, respectively. CONCLUSION Few studies meeting inclusion criteria and small sample sizes highlight the need for further study. Formal auditory training did not appear to improve hearing outcomes. Programming techniques, such as CI signal delay, and hardware optimization, such as multidirectional and remote microphones, show promise to improve outcomes for SSD and AHL CI users.
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Affiliation(s)
- Kristofer G Andren
- Department of Otolaryngology - Head & Neck Surgery, San Antonio Uniformed Services Health Education Consortium, San Antonio, TX, USA
| | - Kevin Duffin
- Uniformed Services University of the Health Sciences, Bethesda, MD, USA
| | - Matthew T Ryan
- Department of Otolaryngology - Head & Neck Surgery, Walter Reed National Military Medical Center, Bethesda, MD, USA
| | - Charles A Riley
- Department of Otolaryngology - Head & Neck Surgery, Walter Reed National Military Medical Center, Bethesda, MD, USA
- Department of Surgery, Uniformed Services University of the Health Sciences, Bethesda, MD, USA
| | - Anthony M Tolisano
- Department of Otolaryngology - Head & Neck Surgery, Walter Reed National Military Medical Center, Bethesda, MD, USA
- Department of Surgery, Uniformed Services University of the Health Sciences, Bethesda, MD, USA
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Tessler I, Gecel NA, Glicksberg BS, Shivatzki S, Shapira Y, Zimlichman E, Alon EE, Klang E, Wolfovitz A. A Five-Decade Text Mining Analysis of Cochlear Implant Research: Where We Started and Where We Are Heading. MEDICINA (KAUNAS, LITHUANIA) 2023; 59:1891. [PMID: 38003940 PMCID: PMC10673015 DOI: 10.3390/medicina59111891] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/06/2023] [Revised: 10/09/2023] [Accepted: 10/19/2023] [Indexed: 11/26/2023]
Abstract
Background and Objectives: Since its invention in the 1970s, the cochlear implant (CI) has been substantially developed. We aimed to assess the trends in the published literature to characterize CI. Materials and Methods: We queried PubMed for all CI-related entries published during 1970-2022. The following data were extracted: year of publication, publishing journal, title, keywords, and abstract text. Search terms belonged to the patient's age group, etiology for hearing loss, indications for CI, and surgical methodological advancement. Annual trends of publications were plotted. The slopes of publication trends were calculated by fitting regression lines to the yearly number of publications. Results: Overall, 19,428 CIs articles were identified. Pediatric-related CI was the most dominant sub-population among the age groups, with the highest rate and slope during the years (slope 5.2 ± 0.3, p < 0.001), while elderly-related CIs had significantly fewer publications. Entries concerning hearing preservation showed the sharpest rise among the methods, from no entries in 1980 to 46 entries in 2021 (slope 1.7 ± 0.2, p < 0.001). Entries concerning robotic surgery emerged in 2000, with a sharp increase in recent years (slope 0.5 ± 0.1, p < 0.001). Drug-eluting electrodes and CI under local-anesthesia have been reported only in the past five years, with a gradual rise. Conclusions: Publications regarding CI among pediatrics outnumbered all other indications, supporting the rising, pivotal role of CI in the rehabilitation of children with sensorineural hearing loss. Hearing-preservation publications have recently rapidly risen, identified as the primary trend of the current era, followed by a sharp rise of robotic surgery that is evolving and could define the next revolution.
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Affiliation(s)
- Idit Tessler
- Department of Otolaryngology and Head and Neck Surgery, Sheba Medical Center, Ramat Gan 52621, Israel (S.S.); (Y.S.); (E.E.A.); (A.W.)
- ARC Innovation Center, Sheba Medical Center, Ramat Gan 52621, Israel; (E.Z.); (E.K.)
| | - Nir A. Gecel
- Department of Otolaryngology and Head and Neck Surgery, Sheba Medical Center, Ramat Gan 52621, Israel (S.S.); (Y.S.); (E.E.A.); (A.W.)
| | - Benjamin S. Glicksberg
- Hasso Plattner Institute for Digital Health, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA
| | - Shaked Shivatzki
- Department of Otolaryngology and Head and Neck Surgery, Sheba Medical Center, Ramat Gan 52621, Israel (S.S.); (Y.S.); (E.E.A.); (A.W.)
| | - Yisgav Shapira
- Department of Otolaryngology and Head and Neck Surgery, Sheba Medical Center, Ramat Gan 52621, Israel (S.S.); (Y.S.); (E.E.A.); (A.W.)
| | - Eyal Zimlichman
- ARC Innovation Center, Sheba Medical Center, Ramat Gan 52621, Israel; (E.Z.); (E.K.)
| | - Eran E. Alon
- Department of Otolaryngology and Head and Neck Surgery, Sheba Medical Center, Ramat Gan 52621, Israel (S.S.); (Y.S.); (E.E.A.); (A.W.)
| | - Eyal Klang
- ARC Innovation Center, Sheba Medical Center, Ramat Gan 52621, Israel; (E.Z.); (E.K.)
- Hasso Plattner Institute for Digital Health, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA
| | - Amit Wolfovitz
- Department of Otolaryngology and Head and Neck Surgery, Sheba Medical Center, Ramat Gan 52621, Israel (S.S.); (Y.S.); (E.E.A.); (A.W.)
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Ford CL, Riggs WJ, Quigley T, Keifer OP, Whitton JP, Valayannopoulos V. The natural history, clinical outcomes, and genotype-phenotype relationship of otoferlin-related hearing loss: a systematic, quantitative literature review. Hum Genet 2023; 142:1429-1449. [PMID: 37679651 PMCID: PMC10511631 DOI: 10.1007/s00439-023-02595-5] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2023] [Accepted: 08/09/2023] [Indexed: 09/09/2023]
Abstract
Congenital hearing loss affects one in 500 newborns. Sequence variations in OTOF, which encodes the calcium-binding protein otoferlin, are responsible for 1-8% of congenital, nonsyndromic hearing loss and are the leading cause of auditory neuropathy spectrum disorders. The natural history of otoferlin-related hearing loss, the relationship between OTOF genotype and hearing loss phenotype, and the outcomes of clinical practices in patients with this genetic disorder are incompletely understood because most analyses have reported on small numbers of cases with homogeneous OTOF genotypes. Here, we present the first systematic, quantitative literature review of otoferlin-related hearing loss, which analyzes patient-specific data from 422 individuals across 61 publications. While most patients display a typical phenotype of severe-to-profound hearing loss with prelingual onset, 10-15% of patients display atypical phenotypes, including mild-to-moderate, progressive, and temperature-sensitive hearing loss. Patients' phenotypic presentations appear to depend on their specific genotypes. For example, non-truncating variants located in and immediately downstream of the C2E calcium-binding domain are more likely to produce atypical phenotypes. Additionally, the prevalence of certain sequence variants and their associated phenotypes varies between populations due to evolutionary founder effects. Our analyses also suggest otoacoustic emissions are less common in older patients and those with two truncating OTOF variants. Critically, our review has implications for the application and limitations of clinical practices, including newborn hearing screenings, hearing aid trials, cochlear implants, and upcoming gene therapy clinical trials. We conclude by discussing the limitations of available research and recommendations for future studies on this genetic cause of hearing loss.
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Zhan KY, Walia A, Durakovic N, Wick CC, Buchman CA, Shew MA, Herzog JA. One-Year Hearing Preservation and Speech Outcomes Comparing Slim Modiolar and Lateral Wall Arrays. Otolaryngol Head Neck Surg 2023; 169:340-347. [PMID: 36814321 DOI: 10.1002/ohn.273] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2022] [Revised: 12/28/2022] [Accepted: 01/02/2023] [Indexed: 02/24/2023]
Abstract
OBJECTIVE Compare postoperative speech outcomes in hearing preservation (HP) cochlear implantation (CI) patients with a low-frequency pure-tone average (LFPTA) ≤ 60 dB using 2 electrode array designs. STUDY DESIGN Retrospective cohort study. SETTING Large academic cochlear implant referral center. METHODS We reviewed adult HP CI cases using either the slim modiolar electrode (SME) (CI 532/CI 632) or th slim lateral wall electrode (SLWE) (CI 624). One-year speech outcomes and HP status were the primary outcomes. RESULTS A total of 132 implanted ears were analyzed (mean age 73.1 years, standard deviation [SD] 12.6), with 72% (N = 95) with CI 532/632 and 28% (N = 37) with CI 624. The mean preoperative LFPTA was 44.8 dB, SD 11.8. One-year functional HP was 27.2% (mean LFPTA shift 46.1 dB, SD 22.1) and was as follows: SME 23.9% and SLWE 36.4%, p = .168. The mean age at implantation was significantly younger only in SLWE patients with preserved hearing (66.9 vs 80.3 years, p = .008). At 6 months, speech measures were significantly better in all outcomes in HP patients with an SLWE than nonpreserved SLWE patients; this effect abated at 1 year as performance among nonpreserved SLWE patients became equivalent to the remaining cohort. Speech outcomes in SME patients were similar regardless of HP status. Age at implantation and datalogging was correlated with speech outcomes. CONCLUSION In this cohort of HP patients, a 1-year functional HP rate of 23.9% (SME) and 36.4% (SLWE) was observed (p = 0.168). This was initially 57.1% (SME) and 70.3% (SLWE) at activation, p = .172. Datalogging and age at implantation were correlated with postoperative speech outcomes.
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Affiliation(s)
- Kevin Y Zhan
- Department of Otolaryngology-Head and Neck Surgery, Division of Otology and Neurotology, Washington University in St Louis, St Louis, Missouri, USA
| | - Amit Walia
- Department of Otolaryngology-Head and Neck Surgery, Division of Otology and Neurotology, Washington University in St Louis, St Louis, Missouri, USA
| | - Nedim Durakovic
- Department of Otolaryngology-Head and Neck Surgery, Division of Otology and Neurotology, Washington University in St Louis, St Louis, Missouri, USA
| | - Cameron C Wick
- Department of Otolaryngology-Head and Neck Surgery, Division of Otology and Neurotology, Washington University in St Louis, St Louis, Missouri, USA
| | - Craig A Buchman
- Department of Otolaryngology-Head and Neck Surgery, Division of Otology and Neurotology, Washington University in St Louis, St Louis, Missouri, USA
| | - Matthew A Shew
- Department of Otolaryngology-Head and Neck Surgery, Division of Otology and Neurotology, Washington University in St Louis, St Louis, Missouri, USA
| | - Jacques A Herzog
- Department of Otolaryngology-Head and Neck Surgery, Division of Otology and Neurotology, Washington University in St Louis, St Louis, Missouri, USA
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20
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Berg KA, Chen C, Noble JH, Dawant BM, Dwyer RT, Labadie RF, Gifford RH. Effects of the Number of Channels and Channel Stimulation Rate on Speech Recognition and Sound Quality Using Precurved Electrode Arrays. Am J Audiol 2023; 32:403-416. [PMID: 37249492 PMCID: PMC10468116 DOI: 10.1044/2023_aja-22-00032] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2022] [Revised: 06/16/2022] [Accepted: 02/05/2023] [Indexed: 05/31/2023] Open
Abstract
PURPOSE This study investigated the relationship between the number of active electrodes, channel stimulation rate, and their interaction on speech recognition and sound quality measures while controlling for electrode placement. Cochlear implant (CI) recipients with precurved electrode arrays placed entirely within scala tympani and closer to the modiolus were hypothesized to be able to utilize more channels and possibly higher stimulation rates to achieve better speech recognition performance and sound quality ratings than recipients in previous studies. METHOD Participants included seven postlingually deafened adult CI recipients with Advanced Bionics Mid-Scala electrode arrays confirmed to be entirely within scala tympani using postoperative computerized tomography. Twelve conditions were tested using four, eight, 12, and 16 electrodes and channel stimulation rates of 600 pulse per second (pps), 1,200 pps, and each participant's maximum allowable rate (1,245-4,800 pps). Measures of speech recognition and sound quality were acutely assessed. RESULTS For the effect of channels, results showed no significant improvements beyond eight channels for all measures. For the effect of channel stimulation rate, results showed no significant improvements with higher rates, suggesting that 600 pps was sufficient for maximum speech recognition performance and sound quality ratings. However, across all conditions, there was a significant relationship between mean electrode-to-modiolus distance and all measures, suggesting that a lower mean electrode-to-modiolus distance was correlated with higher speech recognition scores and sound quality ratings. CONCLUSION These findings suggest that even well-placed precurved electrode array recipients may not be able to take advantage of more than eight channels or higher channel stimulation rates (> 600 pps), but that closer electrode array placement to the modiolus correlates with better outcomes for these recipients.
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Affiliation(s)
- Katelyn A. Berg
- Department of Hearing and Speech Sciences, Vanderbilt University Medical Center, Nashville, TN
| | - Chen Chen
- Research and Technology, Advanced Bionics, LLC, Valencia, CA
| | - Jack H. Noble
- Department of Electrical Engineering and Computer Science, Vanderbilt University, Nashville, TN
| | - Benoit M. Dawant
- Department of Electrical Engineering and Computer Science, Vanderbilt University, Nashville, TN
| | - Robert T. Dwyer
- Research and Technology, Advanced Bionics, LLC, Valencia, CA
| | - Robert F. Labadie
- Department of Otolaryngology-Head and Neck Surgery, Medical University of South Carolina, Charleston
| | - René H. Gifford
- Department of Hearing and Speech Sciences, Vanderbilt University Medical Center, Nashville, TN
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21
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Bader W, Steinacher C, Fischer HT, Glueckert R, Schmutzhard J, Schrott-Fischer A. Effects of Therapeutic Hypothermia on Macrophages in Mouse Cochlea Explants. Int J Mol Sci 2023; 24:8850. [PMID: 37240196 PMCID: PMC10218374 DOI: 10.3390/ijms24108850] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2023] [Revised: 05/04/2023] [Accepted: 05/15/2023] [Indexed: 05/28/2023] Open
Abstract
Globally, over the next few decades, more than 2.5 billion people will suffer from hearing impairment, including profound hearing loss, and millions could potentially benefit from a cochlea implant. To date, several studies have focused on tissue trauma caused by cochlea implantation. The direct immune reaction in the inner ear after an implantation has not been well studied. Recently, therapeutic hypothermia has been found to positively influence the inflammatory reaction caused by electrode insertion trauma. The present study aimed to evaluate the hypothermic effect on the structure, numbers, function and reactivity of macrophages and microglial cells. Therefore, the distribution and activated forms of macrophages in the cochlea were evaluated in an electrode insertion trauma cochlea culture model in normothermic and mild hypothermic conditions. In 10-day-old mouse cochleae, artificial electrode insertion trauma was inflicted, and then they were cultured for 24 h at 37 °C and 32 °C. The influence of mild hypothermia on macrophages was evaluated using immunostaining of cryosections using antibodies against IBA1, F4/80, CD45 and CD163. A clear influence of mild hypothermia on the distribution of activated and non-activated forms of macrophages and monocytes in the inner ear was observed. Furthermore, these cells were located in the mesenchymal tissue in and around the cochlea, and the activated forms were found in and around the spiral ganglion tissue at 37 °C. Our findings suggest that mild hypothermic treatment has a beneficial effect on immune system activation after electrode insertion trauma.
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Affiliation(s)
| | | | | | | | - Joachim Schmutzhard
- Department of Otorhinolaryngology, Medical University Innsbruck, 6020 Innsbruck, Austria; (W.B.); (C.S.); (H.T.F.); (R.G.); (A.S.-F.)
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22
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Robotic pullback technique of a precurved cochlear-implant electrode array using real-time impedance sensing feedback. Int J Comput Assist Radiol Surg 2023; 18:413-421. [PMID: 36331796 DOI: 10.1007/s11548-022-02772-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2022] [Accepted: 10/04/2022] [Indexed: 11/06/2022]
Abstract
PURPOSE During traditional insertion of cochlear implant (CI) electrode arrays (EAs), surgeons rely on limited tactile feedback and visualization of the EA entering the cochlea to control the insertion. One insertion approach for precurved EAs involves slightly overinserting the EA and then retracting it slightly to achieve closer hugging of the modiolus. In this work, we investigate whether electrical impedance sensing could be a valuable real-time feedback tool to advise this pullback technique. METHODS Using a to-scale 3D-printed scala tympani model, a robotic insertion tool, and a custom impedance sensing system, we performed experiments to assess the bipolar insertion impedance profiles for a cochlear CI532/632 precurved EA. Four pairs of contacts from the 22 electrode contacts were chosen based on preliminary testing and monitored in real time to halt the robotic insertion once the closest modiolar position had been achieved but prior to when the angular insertion depth (AID) would be reduced. RESULTS In this setting, the open-loop robotic insertion impedance profiles were very consistent between trials. The exit of each contact from the external stylet of this EA was clearly discernible on the impedance profile. In closed-loop experiments using the pullback technique, the average distance from the electrode contacts to the modiolus was reduced without greatly affecting the AID by using impedance feedback in real time to determine when to stop EA retraction. CONCLUSION Impedance sensing, and specifically the access resistance component of impedance, could be a valuable real-time feedback tool in the operating room during CI EA insertion. Future work should more thoroughly analyze the effects of more realistic operating room conditions and inter-patient variability on this technique.
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23
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Farnsworth PJ, Benson JC, Nassiri AM, Carlson ML, Larson NB, Lane JI. Improved cochlear implant electrode localization using coregistration of pre- and postoperative CT. J Neuroimaging 2023; 33:387-392. [PMID: 36811338 DOI: 10.1111/jon.13094] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2023] [Revised: 02/07/2023] [Accepted: 02/08/2023] [Indexed: 02/24/2023] Open
Abstract
BACKGROUND AND PURPOSE Artifact from cochlear implant electrodes degrades image resolution on CT. Here, we describe the use of coregistered pre- and postoperative CT images to reduce metallic artifact from the electrodes to assess its position more accurately within the cochlear lumen. METHODS Pre- and postoperative CTs were reviewed after coregistration/overlay of both exams. Images were evaluated by two neuroradiologists for scalar location of electrodes tip (± scalar translocation), tip fold over, and angular depth of insertion. RESULTS Thirty-four patients were included in the final cohort. Transscalar migration was present in three (8.8%) cases (one case demonstrated tip fold over), with initial disagreement regarding transscalar migration in 1 out of 34 patients (2.9%). Agreement regarding depth of insertion was present in 31 (91.1%) cases. Five-point Likert scales were used to compare the ability to resolve the proximity of electrodes to the lateral/outer cochlear wall without and with overlay, which is a qualitative measure of artifact from the array. Likert scores showed definitive benefit of metal artifact reduction using overlayed images with an average score of 4.34. CONCLUSION This study demonstrates a novel technique of using fused coregistration of pre- and postoperative CTs for the purpose of artifact reduction/electrode localization. It is anticipated that this technique will permit more accurate localization of the electrodes for improvement in surgical technique and electrode array design.
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Affiliation(s)
| | - John C Benson
- Department of Radiology, Mayo Clinic, Rochester, Minnesota, USA
| | - Ashley M Nassiri
- Department of Otolaryngology-Head and Neck Surgery, Mayo Clinic, Rochester, Minnesota, USA
| | - Matthew L Carlson
- Department of Otolaryngology-Head and Neck Surgery, Mayo Clinic, Rochester, Minnesota, USA
| | - Nicholas B Larson
- Department of Quantitative Health Sciences, Mayo Clinic, Rochester, Minnesota, USA
| | - John I Lane
- Department of Radiology, Mayo Clinic, Rochester, Minnesota, USA
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24
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Ishiyama P, Ishiyama G, Lopez IA, Ishiyama A. Archival Human Temporal Bone: Anatomical and Histopathological Studies of Cochlear Implantation. J Pers Med 2023; 13:352. [PMID: 36836587 PMCID: PMC9959196 DOI: 10.3390/jpm13020352] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2022] [Revised: 02/12/2023] [Accepted: 02/14/2023] [Indexed: 02/22/2023] Open
Abstract
Since being FDA approved in 1984, cochlear implantation has been used successfully to restore hearing in those with severe to profound hearing loss with broader applications including single-sided deafness, the use of hybrid electroacoustic stimulation, and implantation at all extremes of age. Cochlear implants have undergone multiple changes in the design aimed at improving the processing technology, while simultaneously minimizing the surgical trauma and foreign body reaction. The following review examines the human temporal bone studies regarding the anatomy of the human cochlea and how the anatomy relates to cochlear implant design, the factors related to complications after implantation, and the predictors of new tissue formation and osteoneogenesis. Histopathological studies are reviewed which aim to understand the potential implications of the effects of new tissue formation and inflammation following implantation.
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Affiliation(s)
- Paul Ishiyama
- Department of Head and Neck Surgery, David Geffen School of Medicine at UCLA, Los Angeles, CA 90095, USA
| | - Gail Ishiyama
- Department of Neurology, David Geffen School of Medicine at UCLA, Los Angeles, CA 90095, USA
| | - Ivan A. Lopez
- Department of Head and Neck Surgery, David Geffen School of Medicine at UCLA, Los Angeles, CA 90095, USA
| | - Akira Ishiyama
- Department of Head and Neck Surgery, David Geffen School of Medicine at UCLA, Los Angeles, CA 90095, USA
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25
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Polymeric fiber sensors for insertion forces and trajectory determination of cochlear implants in hearing preservation. Biosens Bioelectron 2023; 222:114866. [PMID: 36463651 DOI: 10.1016/j.bios.2022.114866] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2022] [Revised: 10/11/2022] [Accepted: 10/26/2022] [Indexed: 11/06/2022]
Abstract
The level of hearing restoration in patients with severe to profound sensorineural hearing loss by means of cochlear implants (CIs) has drastically risen since the introduction of these neuroprosthetics. The proposed CI integrated with polymer optical fiber Bragg gratings (POFBGs) enables real-time evaluation of insertion forces and trajectory determination during implantation irrespective of the speed of insertion, as well as provides high signal quality, low stiffness levels, minimum induced stress even under forces of high magnitudes and exhibits significant reduction of the risk of fiber breakage inside the constricted cochlear geometry. As such, the proposed device opens new avenues towards atraumatic cochlear implantations and provides a direct route for the next generation of CIs with intraoperative insertion force assessment and path planning capacity crucial for surgical navigation. Hence, adaptation of this technology to clinical reality holds promising prospects for the hearing impaired.
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26
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Karkas A, Boureille P, Laroche N, Vico L, Bergandi F, Marotte H. Imaging of the human cochlea using micro-computed tomography before and after cochlear implantation: comparison with cone-beam computed tomography. Eur Arch Otorhinolaryngol 2023; 280:3131-3140. [PMID: 36604323 DOI: 10.1007/s00405-022-07811-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2022] [Accepted: 12/20/2022] [Indexed: 01/07/2023]
Abstract
PURPOSE Analysis of cochlear structures and postoperative temporal bone (TB) imaging are gaining importance in the evaluation of cochlear implantation (CI°). Our aims were to explore the microarchitecture of human cochlea using micro-computed tomography (μCT), analyze electrode's placement inside cochlea after CI°, and compare pre-/post-implantation μCT scans with cone-beam CT (CBCT) scans of same TBs. METHODS Cadaveric TBs were scanned using μCT and CBCT then underwent CI° using straight electrodes. Thereafter, they underwent again μCT and CBCT-imaging. RESULTS Ten TBs were studied. μCT allowed visualization of scala tympani, scala vestibuli, basilar membrane, osseous spiral lamina, crista fenestrae, and spiral ligament. CBCT showed same structures except spiral ligament and crista fenestrae. After CI°, μCT and CBCT displayed the scalar location and course of electrode array within the cochlea. There were 7 cases of atraumatic electrode insertion and 3 cases of insertion trauma: basilar membrane elevation, electrode foldover with limited migration into scala vestibuli, and electrode kinking with limited migration into scala vestibuli. Insertion trauma was not correlated with cochlea's size or crista's maximal height but with round window membrane diameter. Resolution of μCT was higher than CBCT but electrode artifacts were similar. CONCLUSIONS μCT was accurate in visualizing cochlear structures, and course and scalar position of electrode array inside cochlea with any possible trauma to cochlea or array. CBCT offers a good alternative to μCT in clinical practice for cochlear imaging and evaluation of CI°, with lower radiation and higher resolution than multi-slice CT. Difficulties related to non-traumatic CI° are multifactorial.
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Affiliation(s)
- Alexandre Karkas
- Service Oto-Rhino-Laryngologie, Division of Otology/Neurotology, Hôpital Nord, University Medical Center of Saint-Etienne, CHU Saint-Etienne, 42055, Saint-Etienne, France. .,Laboratory of Biology of Osteo-Articular Tissues, SAINBIOSE Inserm U1059, Saint-Etienne, France. .,Laboratory of Anatomy of Medical School Jacques Lisfranc, Saint-Etienne, France.
| | - Pierre Boureille
- Laboratory of Biology of Osteo-Articular Tissues, SAINBIOSE Inserm U1059, Saint-Etienne, France.,Division of Neuroradiology, University Medical Center of Saint-Etienne, Saint-Etienne, France
| | - Norbert Laroche
- Laboratory of Biology of Osteo-Articular Tissues, SAINBIOSE Inserm U1059, Saint-Etienne, France
| | - Laurence Vico
- Laboratory of Biology of Osteo-Articular Tissues, SAINBIOSE Inserm U1059, Saint-Etienne, France
| | - Florian Bergandi
- Laboratory of Anatomy of Medical School Jacques Lisfranc, Saint-Etienne, France
| | - Hubert Marotte
- Laboratory of Biology of Osteo-Articular Tissues, SAINBIOSE Inserm U1059, Saint-Etienne, France.,Department of Rheumatology, University Medical Center of Saint-Etienne, Saint-Etienne, France
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27
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Gantz JA, Gantz BJ, Kaufmann CR, Henslee AM, Dunn CC, Hua X, Hansen MR. A Steadier Hand: The First Human Clinical Trial of a Single-Use Robotic-Assisted Surgical Device for Cochlear Implant Electrode Array Insertion. Otol Neurotol 2023; 44:34-39. [PMID: 36509435 PMCID: PMC9757840 DOI: 10.1097/mao.0000000000003749] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
OBJECTIVE To evaluate the safety and utility of an investigational robotic-assisted cochlear implant insertion system. STUDY DESIGN Prospective, single-arm, open-label study under abbreviated Investigational Device Exemption requirements. SETTING All procedures were performed, and all data were collected, at a single tertiary referral center. PATIENTS Twenty-one postlingually deafened adult subjects that met Food and Drug Administration indication criteria for cochlear implantation. INTERVENTION All patients underwent standard-of-care surgery for unilateral cochlear implantation with the addition of a single-use robotic-assisted insertion device during cochlear electrode insertion. MAIN OUTCOME MEASURES Successful insertion of cochlear implant electrode array, electrode array insertion time, postoperative implant function. RESULTS Successful robotic-assisted insertion of lateral wall cochlear implant electrode arrays was achieved in 20 (95.2%) of 21 patients. One insertion was unable to be achieved by either robotic-assisted or manual insertion methods, and the patient was retrospectively found to have a preexisting cochlear fracture. Mean intracochlear electrode array insertion time was 3 minutes 15 seconds. All implants with successful robotic-assisted electrode array insertion (n = 20) had normal impedance and neural response telemetry measures for up to 6 months after surgery. CONCLUSIONS Here we report the first human trial of a single-use robotic-assisted surgical device for cochlear implant electrode array insertion. This device successfully and safely inserted lateral wall cochlear implant electrode arrays from the three device manufacturers with devices approved but he Food and Drug Administration.
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Affiliation(s)
- Jay A. Gantz
- Department of Otolaryngology – Head and Neck Surgery, The University of Iowa Carver College of Medicine, 200 Hawkins Drive, Iowa City, IA 52242-1089, USA
| | - Bruce J. Gantz
- Department of Otolaryngology – Head and Neck Surgery, The University of Iowa Carver College of Medicine, 200 Hawkins Drive, Iowa City, IA 52242-1089, USA
- Department of Neurosurgery, The University of Iowa Carver College of Medicine, 200 Hawkins Drive, Iowa City, IA 52242-1089, USA
| | | | | | - Camille C Dunn
- Department of Otolaryngology – Head and Neck Surgery, The University of Iowa Carver College of Medicine, 200 Hawkins Drive, Iowa City, IA 52242-1089, USA
| | - Xiaoyang Hua
- Department of Otolaryngology – Head and Neck Surgery, The University of Iowa Carver College of Medicine, 200 Hawkins Drive, Iowa City, IA 52242-1089, USA
| | - Marlan R. Hansen
- Department of Otolaryngology – Head and Neck Surgery, The University of Iowa Carver College of Medicine, 200 Hawkins Drive, Iowa City, IA 52242-1089, USA
- Department of Neurosurgery, The University of Iowa Carver College of Medicine, 200 Hawkins Drive, Iowa City, IA 52242-1089, USA
- iotaMotion Inc, 14 ½ South Clinton St. Iowa City, IA 52240, USA
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28
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Claussen AD, Shibata SB, Kaufmann CR, Henslee A, Hansen MR. Comparative Analysis of Robotics-Assisted and Manual Insertions of Cochlear Implant Electrode Arrays. Otol Neurotol 2022; 43:1155-1161. [PMID: 36201552 PMCID: PMC10962863 DOI: 10.1097/mao.0000000000003707] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
HYPOTHESIS Robotics-assisted cochlear implant (CI) insertions will result in reduced intracochlear trauma when compared with manual, across multiple users. BACKGROUND Whether intracochlear trauma and translocations are two factors that may contribute to significant variability in CI outcomes remains to be seen. To address this issue, we have developed a robotics-assisted insertion system designed to aid the surgeon in inserting electrode arrays with consistent speeds and reduced variability. This study evaluated the effect of robotics-assisted insertions on the intracochlear trauma as compared with manual insertions in cadaveric cochleae in a simulated operative environment. METHODS Twelve neurotologists performed bilateral electrode insertions into cochleae of full cadaveric heads using both the robotics-assisted system and manual hand insertion. Lateral wall electrodes from three different manufacturers (n = 24) were used and randomized between surgeons. Insertion angle of the electrode and trauma scoring were evaluated using high-resolution three-dimensional x-ray microscopy and compared between robotics-assisted and manual insertions. RESULTS Three-dimensional x-ray microscopy provided excellent resolution to characterize the in situ trauma and insertion angle. Robotics-assisted insertions significantly decreased insertional intracochlear trauma as measured by reduced trauma scores compared with manual insertions (average: 1.3 versus 2.2, device versus manual, respectively; p < 0.05). There was no significant difference between insertion angles observed for manual and robotics-assisted techniques (311 ± 131° versus 307 ± 96°, device versus manual, respectively). CONCLUSIONS Robotics-assisted insertion systems enable standardized electrode insertions across individual surgeons and experience levels. Clinical trials are necessary to investigate whether insertion techniques that reduce insertional variability and the likelihood of intracochlear trauma also improve CI auditory outcomes.
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Affiliation(s)
| | - Seiji B Shibata
- Department of Otolaryngology-Head and Neck Surgery, University of Iowa
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Hrncirik F, Roberts IV, Swords C, Christopher PJ, Chhabu A, Gee AH, Bance ML. Impact of Scala Tympani Geometry on Insertion Forces during Implantation. BIOSENSORS 2022; 12:999. [PMID: 36354508 PMCID: PMC9688204 DOI: 10.3390/bios12110999] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/02/2022] [Revised: 10/25/2022] [Accepted: 11/05/2022] [Indexed: 05/07/2023]
Abstract
(1) Background: During a cochlear implant insertion, the mechanical trauma can cause residual hearing loss in up to half of implantations. The forces on the cochlea during the insertion can lead to this mechanical trauma but can be highly variable between subjects which is thought to be due to differing anatomy, namely of the scala tympani. This study presents a systematic investigation of the influence of different geometrical parameters of the scala tympani on the cochlear implant insertion force. The influence of these parameters on the insertion forces were determined by testing the forces within 3D-printed, optically transparent models of the scala tympani with geometric alterations. (2) Methods: Three-dimensional segmentations of the cochlea were characterised using a custom MATLAB script which parametrised the scala tympani model, procedurally altered the key shape parameters (e.g., the volume, vertical trajectory, curvature, and cross-sectional area), and generated 3D printable models that were printed using a digital light processing 3D printer. The printed models were then attached to a custom insertion setup that measured the insertion forces on the cochlear implant and the scala tympani model during a controlled robotic insertion. (3) Results: It was determined that the insertion force is largely unaffected by the overall size, curvature, vertical trajectory, and cross-sectional area once the forces were normalised to an angular insertion depth. A Capstan-based model of the CI insertion forces was developed and matched well to the data acquired. (4) Conclusion: By using accurate 3D-printed models of the scala tympani with geometrical alterations, it was possible to demonstrate the insensitivity of the insertion forces to the size and shape of the scala tympani, after controlling for the angular insertion depth. This supports the Capstan model of the cochlear implant insertion force which predicts an exponential growth of the frictional force with an angular insertion depth. This concludes that the angular insertion depth, rather than the length of the CI inserted, should be the major consideration when evaluating the insertion force and associated mechanical trauma caused by cochlear implant insertion.
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Affiliation(s)
- Filip Hrncirik
- Cambridge Hearing Group, Cambridge, UK
- Department of Clinical Neurosciences, University of Cambridge, Cambridge CB2 0QQ, UK
| | - Iwan V. Roberts
- Cambridge Hearing Group, Cambridge, UK
- Department of Clinical Neurosciences, University of Cambridge, Cambridge CB2 0QQ, UK
| | - Chloe Swords
- Cambridge Hearing Group, Cambridge, UK
- Department of Physiology, Development and Neurosciences, University of Cambridge, Cambridge CB2 3DY, UK
| | | | - Akil Chhabu
- Clinical School, University of Cambridge, Cambridge CB2 0SP, UK
| | - Andrew H. Gee
- Department of Physiology, Development and Neurosciences, University of Cambridge, Cambridge CB2 3DY, UK
| | - Manohar L. Bance
- Cambridge Hearing Group, Cambridge, UK
- Department of Clinical Neurosciences, University of Cambridge, Cambridge CB2 0QQ, UK
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30
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Topsakal V, Agrawal S, Atlas M, Baumgartner WD, Brown K, Bruce IA, Dazert S, Hagen R, Lassaletta L, Mlynski R, Raine CH, Rajan GP, Schmutzhard J, Sprinzl GM, Staecker H, Usami SI, Van Rompaey V, Zernotti M, van de Heyning P. Minimally Traumatic Cochlear Implant Surgery: Expert Opinion in 2010 and 2020. J Pers Med 2022; 12:jpm12101551. [PMID: 36294690 PMCID: PMC9605439 DOI: 10.3390/jpm12101551] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2022] [Revised: 09/14/2022] [Accepted: 09/17/2022] [Indexed: 12/03/2022] Open
Abstract
This study aimed to discover expert opinion on the surgical techniques and materials most likely to achieve maximum postoperative residual hearing preservation in cochlear implant (CI) surgery and to determine how these opinions have changed since 2010. A previously published questionnaire used in a study published in 2010 was adapted and expanded. The questionnaire was distributed to an international group of experienced CI surgeons. Present results were compared, via descriptive statistics, to those from the 2010 survey. Eighteen surgeons completed the questionnaire. Respondents clearly favored the following: round window insertion, slow array insertion, and the peri- and postoperative use of systematic antibiotics. Insertion depth was regarded as important, and electrode arrays less likely to induce trauma were preferred. The usefulness of dedicated soft-surgery training was also recognized. A lack of agreement was found on whether the middle ear cavity should be flushed with a non-aminoglycoside antibiotic solution or whether a sheath or insertion tube should be used to avoid contaminating the array with blood or bone dust. In conclusion, this paper demonstrates how beliefs about CI soft surgery have changed since 2010 and shows areas of current consensus and disagreement.
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Affiliation(s)
- Vedat Topsakal
- Department of Otorhinolaryngology, Head and Neck Surgery, Brussels Health Campus, University Hospital Brussels (UZ Brussel), Vrije Universiteit Brussel (VUB), 1090 Jette, Belgium
- Department of Otorhinolaryngology, Head and Neck Surgery, Antwerp University Hospital (UZA), University of Antwerp, 2610 Edegem, Belgium
- Correspondence: ; Tel.: +32-2477-6882; Fax: +32-2477-6880
| | - Sumit Agrawal
- London Canada Health Sciences Centre, Department of Otolaryngology–Head & Neck Surgery, Western University, London, ON N6G 2M3, Canada
| | - Marcus Atlas
- Ear Science Institute Australia, Subiaco, WA 6008, Australia
| | | | - Kevin Brown
- UNC Ear & Hearing Center at Chapel Hill School of Medicine, Chapel Hill, NC 27599, USA
| | - Iain A. Bruce
- Royal Manchester Children’s Hospital, Manchester University Hospitals NHS Foundation Trust, Manchester Academic Health Science Centre, Manchester M13 9WL, UK
- Division of Infection, Immunity and Respiratory Medicine, Faculty of Biology, Medicine and Health, University of Manchester, Manchester M15 6JA, UK
| | - Stefan Dazert
- St. Elisabeth Hospital, Ruhr University Bochum, 44787 Bochum, Germany
| | - Rudolf Hagen
- Würzburg ENT University Hospital, 97080 Würzburg, Germany
| | | | - Robert Mlynski
- Department of Otorhinolaryngology, Head and Neck Surgery “Otto Körner”, Rostock University Medical Center, 18057 Rostock, Germany
| | - Christopher H. Raine
- Bradford Royal Infirmary Yorkshire Auditory Implant Service, Bradford BD9 6RJ, UK
| | | | - Joachim Schmutzhard
- Department of Otorhinolaryngology-Head and Neck Surgery, Medical University of Innsbruck, 6020 Innsbruck, Austria
| | | | - Hinrich Staecker
- Department of Otolaryngology-Head & Neck Surgery, University of Kansas Medical Center, Kansas City, KS 66160, USA
| | - Shin-ichi Usami
- Department of Hearing Implant Sciences, Shinshu University School of Medicine, Matsumoto 390-8621, Japan
| | - Vincent Van Rompaey
- Department of Otorhinolaryngology, Head and Neck Surgery, Antwerp University Hospital (UZA), University of Antwerp, 2610 Edegem, Belgium
| | | | - Paul van de Heyning
- Department of Otorhinolaryngology, Head and Neck Surgery, Antwerp University Hospital (UZA), University of Antwerp, 2610 Edegem, Belgium
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Reiss LA, Kirk J, Claussen AD, Fallon JB. Animal Models of Hearing Loss after Cochlear Implantation and Electrical Stimulation. Hear Res 2022; 426:108624. [DOI: 10.1016/j.heares.2022.108624] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/24/2021] [Revised: 03/28/2022] [Accepted: 09/23/2022] [Indexed: 11/04/2022]
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Relationship Between Intraoperative Electrocochleography Responses and Immediate Postoperative Bone Conduction Thresholds in Cochlear Implantation. Otol Neurotol 2022; 43:e880-e887. [PMID: 35970166 DOI: 10.1097/mao.0000000000003620] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
OBJECTIVE To determine the relationship between intraoperative electrocochleography (ECochG) measurements and residual hearing preservation after cochlear implant (CI) surgery by comparing differences between preoperative and immediate postoperative bone conduction thresholds. STUDY DESIGN Prospective cohort study. SETTING Tertiary academic referral center. PATIENTS Sixteen patients with preoperative residual hearing and measurable (no-vibrotactile) bone conduction thresholds at 250 and/or 500 Hz who underwent cochlear implantation. MAIN OUTCOME MEASURE Intraoperative ECochG and air and bone conduction thresholds. RESULTS Nine patients showed no significant drop (<30%) in ECochG amplitude during CI surgery with an average preoperative and immediate postoperative BC threshold of 46 and 39 dB HL, respectively, at 500 Hz. Seven patients with a decrease in ECochG amplitude of 30% or greater showed an average preoperative 500 Hz BC threshold of 32 dB HL and immediate postoperative threshold of 55 dB HL. Air and bone conduction thresholds measured approximately 1 month after CI surgery show delayed-onset of hearing loss across our study patients. CONCLUSIONS A small decrease (<30%) in difference response or cochlear microphonics amplitude correlates with no significant changes in immediate postoperative residual hearing, whereas patients who show larger changes (≥30%) in difference response or cochlear microphonics amplitude during intraoperative ECochG measurements show significant deterioration in BC thresholds. This study reveals the necessity of prompt postoperative bone conduction measurement to isolate the intraoperative cochlear trauma that may be detected during intraoperative ECochG measurements. Although delayed postoperative audiometrics represent longer-term functional hearing, it includes the sum of all postoperative changes during the recovery period, including subacute changes after implantation that may occur days or weeks later. Measuring air and bone conduction thresholds immediately postoperatively will better isolate factors influencing intraoperative, early postoperative, and delayed postoperative hearing loss. This will ultimately help refine surgical technique, device design, and highlight the use of intraoperative ECochG in monitoring cochlear trauma during CI surgery.
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Henslee AM, Kaufmann CR, Andrick MD, Reineke PT, Tejani VD, Hansen MR. Development and Characterization of an Electrocochleography-Guided Robotics-Assisted Cochlear Implant Array Insertion System. Otolaryngol Head Neck Surg 2022; 167:334-340. [PMID: 34609909 PMCID: PMC9969559 DOI: 10.1177/01945998211049210] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
OBJECTIVE Electrocochleography (ECochG) is increasingly being used during cochlear implant (CI) surgery to detect and mitigate insertion-related intracochlear trauma, where a drop in ECochG signal has been shown to correlate with a decline in hearing outcomes. In this study, an ECochG-guided robotics-assisted CI insertion system was developed and characterized that provides controlled and consistent electrode array insertions while monitoring and adapting to real-time ECochG signals. STUDY DESIGN Experimental research. SETTING A research laboratory and animal testing facility. METHODS A proof-of-concept benchtop study evaluated the ability of the system to detect simulated ECochG signal changes and robotically adapt the insertion. Additionally, the ECochG-guided insertion system was evaluated in a pilot in vivo sheep study to characterize the signal-to-noise ratio and amplitude of ECochG recordings during robotics-assisted insertions. The system comprises an electrode array insertion drive unit, an extracochlear recording electrode module, and a control console that interfaces with both components and the surgeon. RESULTS The system exhibited a microvolt signal resolution and a response time <100 milliseconds after signal change detection, indicating that the system can detect changes and respond faster than a human. Additionally, animal results demonstrated that the system was capable of recording ECochG signals with a high signal-to-noise ratio and sufficient amplitude. CONCLUSION An ECochG-guided robotics-assisted CI insertion system can detect real-time drops in ECochG signals during electrode array insertions and immediately alter the insertion motion. The system may provide a surgeon the means to monitor and reduce CI insertion-related trauma beyond manual insertion techniques for improved CI hearing outcomes.
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Affiliation(s)
| | | | | | | | - Viral D. Tejani
- iotaMotion, Inc, Iowa City, Iowa, USA,Department of Otolaryngology–Head and Neck Surgery, University of Iowa, Iowa City, Iowa, USA
| | - Marlan R. Hansen
- iotaMotion, Inc, Iowa City, Iowa, USA,Department of Otolaryngology–Head and Neck Surgery, University of Iowa, Iowa City, Iowa, USA
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Can Electrocochleography Help Preserve Hearing After Cochlear Implantation With Full Electrode Insertion? Otol Neurotol 2022; 43:789-796. [PMID: 35861647 DOI: 10.1097/mao.0000000000003588] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
OBJECTIVES To evaluate the utility of intracochlear electrocochleography (ECochG) monitoring during cochlear implant (CI) surgery on postoperative hearing preservation. STUDY DESIGN Prospective, randomized clinical trial. SETTING Ten high-volume, tertiary care CI centers. PATIENTS Adult patients with sensorineural hearing loss meeting the CI criteria who selected an Advanced Bionics CI. METHODS Patients were randomized to CI surgery either with audible ECochG monitoring available to the surgeon during electrode insertion or without ECochG monitoring. Hearing preservation was determined by comparing preoperative unaided low-frequency (125-, 250-, and 500-Hz) pure-tone average (LF-PTA) to postoperative LF-PTA at CI activation. Pre- and post-CI computed tomography was used to determine electrode scalar location and electrode translocation. RESULTS Eighty-five adult CI candidates were enrolled. The mean (standard deviation [SD]) unaided preoperative LF-PTA across the sample was 54 (17) dB HL. For the whole sample, hearing preservation was "good" (i.e., LF-PTA change 0-15 dB) in 34.5%, "fair" (i.e., LF-PTA change >15-29 dB) in 22.5%, and "poor" (i.e., LF-PTA change ≥30 dB) in 43%. For patients randomized to ECochG "on," mean (SD) LF-PTA change was 27 (20) dB compared with 27 (23) dB for patients randomized to ECochG "off" ( p = 0.89). Seven percent of patients, all of whom were randomized to ECochG off, showed electrode translocation from the scala tympani into the scala vestibuli. CONCLUSIONS Although intracochlear ECochG during CI surgery has important prognostic utility, our data did not show significantly better hearing preservation in patients randomized to ECochG "on" compared with ECochG "off."
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Berg KA, Noble JH, Dawant BM, Dwyer RT, Labadie RF, Gifford RH. Speech recognition as a function of the number of channels for Mid-Scala electrode array recipients. THE JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA 2022; 152:67. [PMID: 35931512 PMCID: PMC9984239 DOI: 10.1121/10.0012163] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/16/2023]
Abstract
This study investigated the number of channels needed for maximum speech understanding and sound quality in 15 adult cochlear implant (CI) recipients with Advanced Bionics (AB) Mid-Scala electrode arrays completely within scala tympani. In experiment I, CI programs used a continuous interleaved sampling (CIS)-based strategy and 4-16 active electrodes. In experiment II, CI programs used an n-of-m strategy featuring 16 active electrodes with either 8- or 12-maxima. Speech understanding and sound quality measures were assessed. For CIS programs, participants demonstrated performance gains using up to 4-10 electrodes on speech measures and sound quality ratings. For n-of-m programs, there was no significant effect of maxima, suggesting 8-maxima is sufficient for this sample's maximum performance and sound quality. These results are largely consistent with previous studies using straight electrode arrays [e.g., Fishman, Shannon, and Slattery (1997). J. Speech Lang. Hear. Res. 40, 1201-1215; Friesen, Shannon, Baskent, and Wang (2001). J. Acoust. Soc. Am. 110, 1150-1163; Shannon, Cruz, and Galvin (2011). Audiol. Neurotol. 16, 113-123; Berg, Noble, Dawant, Dwyer, Labadie, and Gifford (2020). J. Acoust. Soc. Am. 147, 3646-3656] and in contrast with recent studies looking at cochlear precurved electrode arrays [e.g., Croghan, Duran, and Smith (2017). J. Acoust. Soc. Am. 142, EL537-EL543; Berg, Noble, Dawant, Dwuer, Labadie, and Gifford (2019b). J. Acoust. Soc. Am. 145, 1556-1564], which found continuous improvements up to 16 independent channels. These findings suggest that Mid-Scala electrode array recipients demonstrate similar channel independence to straight electrode arrays rather than other manufacturer's precurved electrode arrays.
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Affiliation(s)
- Katelyn A Berg
- Department of Hearing and Speech Sciences, Vanderbilt University Medical Center, 1215 21st Avenue South, Nashville, Tennessee 37232, USA
| | - Jack H Noble
- Department of Electrical Engineering and Computer Science, Vanderbilt University, 2201 West End Avenue, Nashville, Tennessee 37235, USA
| | - Benoit M Dawant
- Department of Electrical Engineering and Computer Science, Vanderbilt University, 2201 West End Avenue, Nashville, Tennessee 37235, USA
| | - Robert T Dwyer
- Advanced Bionics, 28515 Westinghouse Place, Valencia, California 91355, USA
| | - Robert F Labadie
- Department of Otolaryngology, Vanderbilt University Medical Center, 1215 21st Avenue South, Nashville, Tennessee 37232, USA
| | - René H Gifford
- Department of Hearing and Speech Sciences, Vanderbilt University Medical Center, 1215 21st Avenue South, Nashville, Tennessee 37232, USA
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Holder JT, Holcomb MA, Snapp H, Labadie RF, Vroegop J, Rocca C, Elgandy MS, Dunn C, Gifford RH. Guidelines for Best Practice in the Audiological Management of Adults Using Bimodal Hearing Configurations. OTOLOGY & NEUROTOLOGY OPEN 2022; 2:e011. [PMID: 36274668 PMCID: PMC9581116 DOI: 10.1097/ono.0000000000000011] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
Clinics are treating a growing number of patients with greater amounts of residual hearing. These patients often benefit from a bimodal hearing configuration in which acoustic input from a hearing aid on 1 ear is combined with electrical stimulation from a cochlear implant on the other ear. The current guidelines aim to review the literature and provide best practice recommendations for the evaluation and treatment of individuals with bilateral sensorineural hearing loss who may benefit from bimodal hearing configurations. Specifically, the guidelines review: benefits of bimodal listening, preoperative and postoperative cochlear implant evaluation and programming, bimodal hearing aid fitting, contralateral routing of signal considerations, bimodal treatment for tinnitus, and aural rehabilitation recommendations.
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Affiliation(s)
| | | | | | | | | | - Christine Rocca
- Guy’s and St. Thomas’ Hearing Implant Centre, London, United Kingdom
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Skarżyński PH, Lorens A, Walkowiak A, Polak M, Skarżyński H. Multi-Frequency Intraoperative Monitoring of Hearing Preservation during Cochlear Implantation. Life (Basel) 2022; 12:life12050636. [PMID: 35629304 PMCID: PMC9143534 DOI: 10.3390/life12050636] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2022] [Revised: 04/19/2022] [Accepted: 04/20/2022] [Indexed: 11/24/2022] Open
Abstract
(1) Background: Current indications for cochlear implants (CIs) have expanded to include patients with appreciable low-frequency hearing. However, longitudinal results indicate that only one-third of these recipients retain full hearing preservation. In another words, the remaining two-thirds lose this facility either partially or fully. This points to the need to better understand the impact of cochlear implantation on cochlear integrity. Intracochlear electrocochleography (ECochG) involves the recording of electrical potentials generated in the inner ear in response to acoustic stimuli, and previous studies have shown that these potentials give an indication of residual inner ear function. Aim of the research: The aim is to monitor intracochlear ECochG during CI surgery and gain a better understanding of how the implant impacted inner ear function. A newly developed SPL Chirp was used for stimulation. (2) Methods: Intracochlear ECochG signals were measured in a subject with residual preoperative low-frequency hearing, while an electrode array was introduced into the cochlea and was continued until the round window was sealed. Afterwards, surgical events were reviewed with the surgeon; preoperative and postoperative radiological data and hearing thresholds were also evaluated. (3) Conclusions: Real-time intraoperative monitoring, with multifrequency evaluation and video recording, has the potential to allow surgeons and audiologists to continuously assess cochlear function. ECochG monitoring may be a useful tool during cochlear implantation to gain frequency-specific information on the status of the patient’s hearing, assisting surgeons to lower hearing trauma during the operation.
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Affiliation(s)
- Piotr Henryk Skarżyński
- World Hearing Center, Institute of Physiology and Pathology of Hearing, 02-042 Warsaw, Poland; (A.L.); (A.W.); (H.S.)
- Institute of Sensory Organs, 05-830 Kajetany, Poland
- Center of Hearing and Speech Medincus, 05-830 Kajetany, Poland
- Heart Failure and Cardiac Rehabilitation Department, Second Faculty of Medicine, Medical University of Warsaw, 03-242 Warsaw, Poland
- Correspondence:
| | - Artur Lorens
- World Hearing Center, Institute of Physiology and Pathology of Hearing, 02-042 Warsaw, Poland; (A.L.); (A.W.); (H.S.)
| | - Adam Walkowiak
- World Hearing Center, Institute of Physiology and Pathology of Hearing, 02-042 Warsaw, Poland; (A.L.); (A.W.); (H.S.)
| | - Marek Polak
- R&D Med-El, Furstenweg 77A, 6020 Innsbruck, Austria;
| | - Henryk Skarżyński
- World Hearing Center, Institute of Physiology and Pathology of Hearing, 02-042 Warsaw, Poland; (A.L.); (A.W.); (H.S.)
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Intracochlear New Fibro-Ossification and Neuronal Degeneration Following Cochlear Implant Electrode Translocation: Long-Term Histopathological Findings in Humans. Otol Neurotol 2022; 43:e153-e164. [PMID: 35015749 DOI: 10.1097/mao.0000000000003402] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
OBJECTIVE We aim to assess the histopathology of human temporal bones (TBs) with evidence of cochlear implantation (CI) electrode scalar translocation. STUDY DESIGN Otopathology study. SETTING Otopathology laboratory. PATIENTS TBs from patients who had a history of CI and histopathological evidence of interscalar translocation. Specimens with electrode placed entirely within the ST served as controls. INTERVENTION Histopathological assessment of human TBs. MAIN OUTCOME MEASURES TBs from each patient were harvested postmortem and histologically analyzed for intracochlear changes in the context of CI electrode translocation and compared to controls. Intracochlear new fibro-ossification, and spiral ganglion neuron (SGN) counts were assessed. Postoperative word recognition scores (WRS) were also compared. RESULTS Nineteen human TBs with electrode translocation and eight controls were identified. The most common site of translocation was the ascending limb of the basal turn (n = 14 TBs). The average angle of insertion at the point of translocation was 159° ± 79°. Eighteen translocated cases presented moderate fibroosseous changes in the basal region of the cochlea, extending to the translocation point and/or throughout the electrode track in 42%. Lower SGN counts were more pronounced in translocated cases compared to controls, with a significant difference for segment II (p = 0.019). Although final postoperative hearing outcomes were similar between groups, translocated cases had slower rate of improvement in WRS (p = 0.021). CONCLUSIONS Cochlear implant electrode translocation was associated with greater fibroosseous formation and lower SGN population. Our findings suggest that scalar translocations may slow the rate of improvement in WRS overtime as compared to atraumatic electrode insertions.Level of evidence: IV.
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Frithioff A, Frendø M, Mikkelsen PT, Sørensen MS, Andersen SAW. Cochlear implantation: Exploring the effects of 3D stereovision in a digital microscope for virtual reality simulation training - A randomized controlled trial. Cochlear Implants Int 2021; 23:80-86. [PMID: 34852727 DOI: 10.1080/14670100.2021.1997026] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Abstract
In cochlear implantation (CI), excellent surgical technique is critical for hearing outcomes. Recent advances in temporal bone Virtual Reality (VR) training allow for specific training of CI and through introduction of new digital microscopes with ultra-high-fidelity (UHF) graphics. This study aims to investigate whether UHF increases performance in VR simulation training of CI electrode insertion compared with conventional, screen-based VR (cVR). METHODS Twenty-four medical students completed a randomized, controlled trial of an educational intervention. They performed a total of eight CI electrode insertions each in blocks of four using either UHF-VR or cVR, in randomized order. CI electrode insertion performances were rated by two blinded expert raters using a structured assessment tool supported by validity evidence. RESULTS Performance scores in cVR were higher than in the UHF-VR simulation although this was not significant (19.8 points, 95% CI [19.3-20.3] vs. 18.8 points, 95% CI [18.2-19.4]; P = 0.09). The decisive factor for performance was participants' ability to achieve stereovision (mean difference = 1.1 points, 95% CI [0.15-2.08], P = 0.02). DISCUSSION No additional benefit was found from UHF-VR over cVR training of CI electrode insertion for novices. Consequently, standard cVR simulation should be used for novices' basic skills acquisition in CI surgery. Future studies should instead explore the effects of other improvements in CI surgery training and if the lacking benefit of UHF-VR also applies for more experienced learners. CONCLUSION The increased graphical perception and the superior lifelikeness of UHF-VR does not improve early skills acquisition of CI insertion for novices.
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Affiliation(s)
- Andreas Frithioff
- Copenhagen Hearing and Balance Center, Department of Otorhinolaryngology Head & Neck Surgery and Audiology, Rigshospitalet, Copenhagen, Denmark.,Copenhagen Academy for Medical Education and Simulation (CAMES), Center for HR & Education, RegionH, Copenhagen, Denmark
| | - Martin Frendø
- Copenhagen Hearing and Balance Center, Department of Otorhinolaryngology Head & Neck Surgery and Audiology, Rigshospitalet, Copenhagen, Denmark.,Copenhagen Academy for Medical Education and Simulation (CAMES), Center for HR & Education, RegionH, Copenhagen, Denmark
| | | | - Mads Sølvsten Sørensen
- Copenhagen Hearing and Balance Center, Department of Otorhinolaryngology Head & Neck Surgery and Audiology, Rigshospitalet, Copenhagen, Denmark
| | - Steven Arild Wuyts Andersen
- Copenhagen Hearing and Balance Center, Department of Otorhinolaryngology Head & Neck Surgery and Audiology, Rigshospitalet, Copenhagen, Denmark.,Copenhagen Academy for Medical Education and Simulation (CAMES), Center for HR & Education, RegionH, Copenhagen, Denmark
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Lin CC, Chiu T, Chiou HP, Chang CM, Hsu CJ, Wu HP. Residual hearing preservation for cochlear implantation surgery. Tzu Chi Med J 2021; 33:359-364. [PMID: 34760631 PMCID: PMC8532579 DOI: 10.4103/tcmj.tcmj_181_20] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2020] [Revised: 08/21/2020] [Accepted: 09/11/2020] [Indexed: 11/25/2022] Open
Abstract
Cochlear implantation (CI) has developed for more than four decades. Initially, CI was used for profound bilateral hearing impairment. However, the indications for CI have expanded in recent years to include children with symptomatic partial deafness. Therefore, CI strategies to preserve residual hearing are important for both patients and otologists. The loss of residual low-frequency hearing is thought to be the result of many factors. All surgical methods have the same goal: protect the delicate intracochlear structures and preserve residual low-frequency hearing to improve speech perception abilities. Fully opening the round window membrane, a straight electrode array, slower insertion speed, and the use of corticosteroids result in a higher rate of hearing preservation. Several factors, like the way of surgical approaches, length of arrays and timing of activation, may not affect the residual hearing preservation. Therefore, the classic atraumatic technique, including the very slow and delicate insertion and administration of intraoperative corticosteroids, can improve hearing outcomes.
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Affiliation(s)
- Chung-Ching Lin
- Department of Otolaryngology, Taichung Tzu Chi Hospital, Buddhist Tzu Chi Medical Foundation, Taichung, Taiwan.,School of Medicine, Tzu Chi University, Hualien, Taiwan
| | - Ting Chiu
- Department of Otolaryngology, Taichung Tzu Chi Hospital, Buddhist Tzu Chi Medical Foundation, Taichung, Taiwan
| | - Hong-Ping Chiou
- Department of Otolaryngology, Taichung Tzu Chi Hospital, Buddhist Tzu Chi Medical Foundation, Taichung, Taiwan
| | - Chu-Man Chang
- Department of Otolaryngology, Taichung Tzu Chi Hospital, Buddhist Tzu Chi Medical Foundation, Taichung, Taiwan
| | - Chuan-Jen Hsu
- Department of Otolaryngology, Taichung Tzu Chi Hospital, Buddhist Tzu Chi Medical Foundation, Taichung, Taiwan.,School of Medicine, Tzu Chi University, Hualien, Taiwan
| | - Hung-Pin Wu
- Department of Otolaryngology, Taichung Tzu Chi Hospital, Buddhist Tzu Chi Medical Foundation, Taichung, Taiwan.,School of Medicine, Tzu Chi University, Hualien, Taiwan
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Implications of Phase Changes in Extracochlear Electrocochleographic Recordings During Cochlear Implantation. Otol Neurotol 2021; 43:e181-e190. [PMID: 34772884 DOI: 10.1097/mao.0000000000003414] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
OBJECTIVE To assess the prevalence and implications of phase changes in extracochlear electrocochleography (ECochG) recordings during cochlear implantation. MATERIALS AND METHODS Extracochlear ECochG recordings were performed before and after insertion of the cochlear implant (CI) electrode by a recording electrode placed on the promontory. Acoustic stimuli were tone bursts at 250, 500, 750, and 1,000 Hz. The pure tone average (PTA) was determined before and approximately 4 weeks after surgery. RESULTS Extracochlear ECochG recordings in 69 ears of 68 subjects were included. At 250 Hz, the mean phase change was 43° (n = 50, standard deviation (SD) 44°), at 500 Hz 36° (n = 64, SD 36°), at 750 Hz 33° (n = 42, SD 39°), and at 1,000 Hz 22° (n = 54, SD 27°). Overall, in 48 out of 210 ECochG recordings a phase change of ≥45° (23%) was detectable. Ears with an amplitude drop >3 dB and a phase change ≥45° (n = 3) had a complete or near complete loss of residual cochlear function in all cases. A phase change of ≥90° in one recording was not associated with a larger amplitude change of the ECochG signal (1.9 dB vs. -0.9 dB, p = 0.1052, n = 69), but with a significantly larger postoperative hearing loss (17 dB vs. 26 dB, p = 0.0156, n = 69). CONCLUSIONS Phase changes occur regularly in extracochlear ECochG recordings during cochlear implantation. Phase changes of ≥90° with or without amplitude changes in the ECochG signal are associated with a larger postoperative hearing loss and could therefore represent an independent marker for cochlear trauma or changes of inner ear mechanics relevant for the postoperative hearing outcome.
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Torres R, Daoudi H, Lahlou G, Sterkers O, Ferrary E, Mosnier I, Nguyen Y. Restoration of High Frequency Auditory Perception After Robot-Assisted or Manual Cochlear Implantation in Profoundly Deaf Adults Improves Speech Recognition. Front Surg 2021; 8:729736. [PMID: 34568420 PMCID: PMC8461256 DOI: 10.3389/fsurg.2021.729736] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2021] [Accepted: 08/17/2021] [Indexed: 11/13/2022] Open
Abstract
Background and Purpose: Robot-assisted cochlear implantation has recently been implemented in clinical practice; however, its effect on hearing outcomes is unknown. The aim of this preliminary study was to evaluate hearing performance 1 year post-implantation whether the electrode array was inserted manually or assisted by a robot. Methods: Forty-two profoundly deaf adults were implanted either manually (n = 21) or assisted by a robot (RobOtol®, Collin, Bagneux, France) with three different electrode array types. Participants were paired by age, and electrode array type. The scalar position of the electrode array in the cochlea was assessed by 3D reconstruction from the pre- and post-implantation computed tomography. Pure-tone audiometry and speech perception in silence (percentage of disyllabic words at 60 dB) were tested on the implanted ear 1 year post-implantation in free-field conditions. The pure-tone average was calculated at 250–500–750 Hz, 500–1,000–2,000–3,000 Hz, and 3,000–4,000–8,000 Hz for low, mid, and high frequencies, respectively. Results: One year after cochlear implantation, restoration of the high-frequency thresholds was associated with better speech perception in silence, but not with low or mid frequencies (p < 0.0001; Adjusted R2 = 0.64, polynomial non-linear regression). Although array translocation was similar using either technique, the number of translocated electrodes was lower when the electrode arrays had been inserted with the assistance of the robot compared with manual insertion (p = 0.018; Fisher's exact test). Conclusion: The restoration of high-frequency thresholds (3,000–4,000–8,000 Hz) by cochlear implantation was associated with good speech perception in silence. The numbers of translocated electrodes were reduced after a robot-assisted insertion.
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Affiliation(s)
- Renato Torres
- Unité Fonctionnelle Implants Auditifs, Service Oto-Rhino-Laryngologie, AP-HP/Sorbonne Université, Paris, France.,Centre de Recherche en Audiologie Adulte, GHU Pitié-Salpêtrière/Fondation Pour l'Audition, AP-HP, Paris, France.,Technologies et Thérapie Génique Pour la Surdité, Institut de l'Audition, Institut Pasteur, INSERM, Paris, France.,Departamento de Ciencias Fisiológicas, Facultad de Medicina, Universidad Nacional de San Agustín de Arequipa, Arequipa, Peru
| | - Hannah Daoudi
- Unité Fonctionnelle Implants Auditifs, Service Oto-Rhino-Laryngologie, AP-HP/Sorbonne Université, Paris, France.,Centre de Recherche en Audiologie Adulte, GHU Pitié-Salpêtrière/Fondation Pour l'Audition, AP-HP, Paris, France.,Technologies et Thérapie Génique Pour la Surdité, Institut de l'Audition, Institut Pasteur, INSERM, Paris, France
| | - Ghizlene Lahlou
- Unité Fonctionnelle Implants Auditifs, Service Oto-Rhino-Laryngologie, AP-HP/Sorbonne Université, Paris, France.,Centre de Recherche en Audiologie Adulte, GHU Pitié-Salpêtrière/Fondation Pour l'Audition, AP-HP, Paris, France.,Technologies et Thérapie Génique Pour la Surdité, Institut de l'Audition, Institut Pasteur, INSERM, Paris, France
| | - Olivier Sterkers
- Unité Fonctionnelle Implants Auditifs, Service Oto-Rhino-Laryngologie, AP-HP/Sorbonne Université, Paris, France.,Centre de Recherche en Audiologie Adulte, GHU Pitié-Salpêtrière/Fondation Pour l'Audition, AP-HP, Paris, France.,Technologies et Thérapie Génique Pour la Surdité, Institut de l'Audition, Institut Pasteur, INSERM, Paris, France
| | - Evelyne Ferrary
- Unité Fonctionnelle Implants Auditifs, Service Oto-Rhino-Laryngologie, AP-HP/Sorbonne Université, Paris, France.,Centre de Recherche en Audiologie Adulte, GHU Pitié-Salpêtrière/Fondation Pour l'Audition, AP-HP, Paris, France.,Technologies et Thérapie Génique Pour la Surdité, Institut de l'Audition, Institut Pasteur, INSERM, Paris, France
| | - Isabelle Mosnier
- Unité Fonctionnelle Implants Auditifs, Service Oto-Rhino-Laryngologie, AP-HP/Sorbonne Université, Paris, France.,Centre de Recherche en Audiologie Adulte, GHU Pitié-Salpêtrière/Fondation Pour l'Audition, AP-HP, Paris, France.,Technologies et Thérapie Génique Pour la Surdité, Institut de l'Audition, Institut Pasteur, INSERM, Paris, France
| | - Yann Nguyen
- Unité Fonctionnelle Implants Auditifs, Service Oto-Rhino-Laryngologie, AP-HP/Sorbonne Université, Paris, France.,Centre de Recherche en Audiologie Adulte, GHU Pitié-Salpêtrière/Fondation Pour l'Audition, AP-HP, Paris, France.,Technologies et Thérapie Génique Pour la Surdité, Institut de l'Audition, Institut Pasteur, INSERM, Paris, France
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Riojas KE, Tran ET, Freeman MH, Noble JH, Webster RJ, Labadie RF. Clinical Translation of an Insertion Tool for Minimally Invasive Cochlear Implant Surgery. J Med Device 2021; 15:031001. [PMID: 33995757 PMCID: PMC8086187 DOI: 10.1115/1.4050203] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2020] [Revised: 01/22/2021] [Indexed: 11/08/2022] Open
Abstract
The objective of this paper is to describe the development of a minimally invasive cochlear implant surgery (MICIS) electrode array insertion tool concept to enable clinical translation. First, analysis of the geometric parameters of potential MICIS patients (N = 97) was performed to inform tool design, inform MICIS phantom model design, and provide further insight into MICIS candidacy. Design changes were made to the insertion tool based on clinical requirements and parameter analysis results. A MICIS phantom testing model was built to evaluate insertion force profiles in a clinically realistic manner, and the new tool design was evaluated in the model and in cadavers to test clinical viability. Finally, after regulatory approval, the tool was used for the first time in a clinical case. Results of this work included first, in the parameter analysis, approximately 20% of the population was not considered viable MICIS candidates. Additionally, one 3D printed tool could accommodate all viable candidates with polyimide sheath length adjustments accounting for interpatient variation. The insertion tool design was miniaturized out of clinical necessity and a disassembly method, necessary for removal around the cochlear implant, was developed and tested. Phantom model testing revealed that the force profile of the insertion tool was similar to that of traditional forceps insertion. Cadaver testing demonstrated that all clinical requirements (including complete disassembly) were achieved with the tool, and the new tool enabled 15% deeper insertions compared to the forceps approach. Finally, and most importantly, the tool helped achieve a full insertion in its first MICIS clinical case. In conclusion, the new insertion tool provides a clinically viable solution to one of the most difficult aspects of MICIS.
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Affiliation(s)
- Katherine E. Riojas
- Department of Mechanical Engineering, Vanderbilt University, Nashville, TN 37212
| | - Emily T. Tran
- Department of Mechanical Engineering, The University of Tulsa, Tulsa, OK 74104
| | - Michael H. Freeman
- Department of Otolaryngology–Head and Neck Surgery, Vanderbilt University Medical Center, Nashville, TN 37232
| | - Jack H. Noble
- Department of Electrical Engineering and Computer Science, Vanderbilt University, Nashville, TN 37212
| | - Robert J. Webster
- Department of Mechanical Engineering, Vanderbilt University, Nashville, TN 37212
| | - Robert F. Labadie
- Department of Otolaryngology–Head and Neck Surgery, Vanderbilt University Medical Center, Nashville, TN 37232
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Schwam ZG, Kaul VF, Perez E, Wanna GB, Cosetti MK. Initial Experience With a Recently Developed Lateral Wall Electrode. Laryngoscope 2021; 131:2782-2788. [PMID: 34296451 DOI: 10.1002/lary.29779] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/01/2021] [Revised: 07/07/2021] [Accepted: 07/15/2021] [Indexed: 11/07/2022]
Abstract
OBJECTIVE To review our hearing preservation rates and speech recognition outcomes in patients undergoing cochlear implantation with a recently developed lateral wall electrode. STUDY DESIGN Retrospective cohort study. METHODS Retrospective case series of all patients, both pediatric and adult, undergoing cochlear implantation with the Advanced Bionics Hifocus™ SlimJ electrode between December 2017 and January 2020. Main outcomes included hearing preservation rates using several definitions, speech recognition testing primarily through Arizona Biosciences (AzBio) and Consonant-Nucleus-Consonant (CNC) testing, intra- and postoperative complications. RESULTS Sixty-one ears underwent implantation with the new electrode. Hearing preservation rates were 13.0% to 36.0% depending on the definition used. Speech recognition testing showed significant increases from pre- to postoperative condition (Implant-only AzBio: 24.1 to 48.3, P = .004, binaural AzBio: 46.1 to 65.9, P = .002, Implant-only CNC: 9.7 to 35.1, P < .001, binaural CNC: 29.8 to 59.40, P < .001) with last speech recognition testing occurring an average of 8.8 months postoperatively. The elderly population had the worst hearing preservation rates across all definitions. Five explantations were required due to two infections and three device failures. CONCLUSION Hearing preservation rates varied significantly depending on the definition used, but users experienced a significant improvement in speech recognition testing after implantation. More work is needed in the community to standardize the definition of residual hearing and hearing preservation. LEVEL OF EVIDENCE 4 Laryngoscope, 2021.
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Affiliation(s)
- Zachary G Schwam
- Department of Otolaryngology-Head and Neck Surgery, Icahn School of Medicine at Mount Sinai, New York, New York, U.S.A.,Department of Otolaryngology, New York Eye and Ear Infirmary of Mount Sinai, New York, New York, U.S.A
| | - Vivian F Kaul
- Department of Otolaryngology-Head and Neck Surgery, Icahn School of Medicine at Mount Sinai, New York, New York, U.S.A.,Department of Otolaryngology, New York Eye and Ear Infirmary of Mount Sinai, New York, New York, U.S.A
| | - Enrique Perez
- Department of Otolaryngology-Head and Neck Surgery, Icahn School of Medicine at Mount Sinai, New York, New York, U.S.A.,Department of Otolaryngology, New York Eye and Ear Infirmary of Mount Sinai, New York, New York, U.S.A
| | - George B Wanna
- Department of Otolaryngology-Head and Neck Surgery, Icahn School of Medicine at Mount Sinai, New York, New York, U.S.A.,Department of Otolaryngology, New York Eye and Ear Infirmary of Mount Sinai, New York, New York, U.S.A
| | - Maura K Cosetti
- Department of Otolaryngology-Head and Neck Surgery, Icahn School of Medicine at Mount Sinai, New York, New York, U.S.A.,Department of Otolaryngology, New York Eye and Ear Infirmary of Mount Sinai, New York, New York, U.S.A
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Jia H, Pan J, Gu W, Tan H, Chen Y, Zhang Z, Jiang M, Li Y, Sterkers O, Wu H. Robot-Assisted Electrode Array Insertion Becomes Available in Pediatric Cochlear Implant Recipients: First Report and an Intra-Individual Study. Front Surg 2021; 8:695728. [PMID: 34307444 PMCID: PMC8294934 DOI: 10.3389/fsurg.2021.695728] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2021] [Accepted: 06/02/2021] [Indexed: 11/28/2022] Open
Abstract
Background: As an advanced surgical technique to reduce trauma to the inner ear, robot-assisted electrode array (EA) insertion has been applied in adult cochlear implantation (CI) and was approved as a safe surgical procedure that could result in better outcomes. As the mastoid and temporal bones are generally smaller in children, which would increase the difficulty for robot-assisted manipulation, the clinical application of these systems for CI in children has not been reported. Given that the pediatric candidate is the main population, we aim to investigate the safety and reliability of robot-assisted techniques in pediatric cochlear implantation. Methods: Retrospective cohort study at a referral center in Shanghai including all patients of simultaneous bilateral CI with robotic assistance on one side (RobOtol® system, Collin ORL, Bagneux, France), and manual insertion on the other (same brand of EA and CI in both side), from December 2019 to June 2020. The surgical outcomes, radiological measurements (EA positioning, EA insertion depth, mastoidectomy size), and audiological outcomes (Behavior pure-tone audiometry) were evaluated. Results: Five infants (17.8 ± 13.5 months, ranging from 10 to 42 months) and an adult (39 years old) were enrolled in this study. Both perimodiolar and lateral wall EAs were included. The robot-assisted EA insertion was successfully performed in all cases, although the surgical zone in infants was about half the size in adults, and no difference was observed in mastoidectomy size between robot-assisted and manual insertion sides (p = 0.219). The insertion depths of EA with two techniques were similar (P = 0.583). The robot-assisted technique showed no scalar deviation, but scalar deviation occurred for one manually inserted pre-curved EA (16%). Early auditory performance was similar to both techniques. Conclusion: Robot-assisted technique for EA insertion is approved to be used safely and reliably in children, which is possible and potential for better scalar positioning and might improve long-term auditory outcome. Standard mastoidectomy size was enough for robot-assisted technique. This first study marks the arrival of the era of robotic CI for all ages.
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Affiliation(s)
- Huan Jia
- Department of Otorhinolaryngology Head and Neck Surgery, Shanghai Ninth People's Hospital, Shanghai Jiaotong University School of Medicine, Shanghai, China.,Ear Institute, Shanghai Jiaotong University School of Medicine, Shanghai, China.,Shanghai Key Laboratory of Translational Medicine on Ear and Nose Diseases, Shanghai, China
| | - Jinxi Pan
- Department of Otorhinolaryngology Head and Neck Surgery, Shanghai Ninth People's Hospital, Shanghai Jiaotong University School of Medicine, Shanghai, China.,Ear Institute, Shanghai Jiaotong University School of Medicine, Shanghai, China.,Shanghai Key Laboratory of Translational Medicine on Ear and Nose Diseases, Shanghai, China
| | - Wenxi Gu
- Department of Otorhinolaryngology Head and Neck Surgery, Shanghai Ninth People's Hospital, Shanghai Jiaotong University School of Medicine, Shanghai, China.,Ear Institute, Shanghai Jiaotong University School of Medicine, Shanghai, China.,Shanghai Key Laboratory of Translational Medicine on Ear and Nose Diseases, Shanghai, China
| | - Haoyue Tan
- Department of Otorhinolaryngology Head and Neck Surgery, Shanghai Ninth People's Hospital, Shanghai Jiaotong University School of Medicine, Shanghai, China.,Ear Institute, Shanghai Jiaotong University School of Medicine, Shanghai, China.,Shanghai Key Laboratory of Translational Medicine on Ear and Nose Diseases, Shanghai, China
| | - Ying Chen
- Department of Otorhinolaryngology Head and Neck Surgery, Shanghai Ninth People's Hospital, Shanghai Jiaotong University School of Medicine, Shanghai, China.,Ear Institute, Shanghai Jiaotong University School of Medicine, Shanghai, China.,Shanghai Key Laboratory of Translational Medicine on Ear and Nose Diseases, Shanghai, China
| | - Zhihua Zhang
- Department of Otorhinolaryngology Head and Neck Surgery, Shanghai Ninth People's Hospital, Shanghai Jiaotong University School of Medicine, Shanghai, China.,Ear Institute, Shanghai Jiaotong University School of Medicine, Shanghai, China.,Shanghai Key Laboratory of Translational Medicine on Ear and Nose Diseases, Shanghai, China
| | - Mengda Jiang
- Department of Radiology, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Yun Li
- Department of Otorhinolaryngology Head and Neck Surgery, Shanghai Ninth People's Hospital, Shanghai Jiaotong University School of Medicine, Shanghai, China.,Ear Institute, Shanghai Jiaotong University School of Medicine, Shanghai, China.,Shanghai Key Laboratory of Translational Medicine on Ear and Nose Diseases, Shanghai, China
| | - Olivier Sterkers
- Department of Otorhinolaryngology Head and Neck Surgery, Shanghai Ninth People's Hospital, Shanghai Jiaotong University School of Medicine, Shanghai, China.,APHP, Groupe hospitalo-Universitaire Pitié Salpêtrière, Otorhinolaryngology Department, Unit of Otology, Auditory Implants and Skull Base Surgery, Paris, France
| | - Hao Wu
- Department of Otorhinolaryngology Head and Neck Surgery, Shanghai Ninth People's Hospital, Shanghai Jiaotong University School of Medicine, Shanghai, China.,Ear Institute, Shanghai Jiaotong University School of Medicine, Shanghai, China.,Shanghai Key Laboratory of Translational Medicine on Ear and Nose Diseases, Shanghai, China
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Barriat S, Peigneux N, Duran U, Camby S, Lefebvre PP. The Use of a Robot to Insert an Electrode Array of Cochlear Implants in the Cochlea: A Feasibility Study and Preliminary Results. Audiol Neurootol 2021; 26:361-367. [PMID: 33902040 DOI: 10.1159/000513509] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2020] [Accepted: 12/01/2020] [Indexed: 11/19/2022] Open
Abstract
INTRODUCTION Cochlear implants (CIs) are commonly used for the rehabilitation of profound bilateral hearing loss. However, patients with substantial residual acoustic hearing are potential CI candidates. Because of both improvements in technology and advancements in surgical techniques, it may be possible to preserve hearing to some extent. For more than a decade, it has been suggested that robots are used to perform middle ear surgery. We evaluated the use of the RobOtol® otologic robot specifically to insert CI electrodes into the inner ear. METHODS CI surgery with the conventional approach was performed under general anesthesia. The MED-El Flex 24-electrode array was inserted using RobOtol®. Video recordings were used to calculate the speed of insertion. The positions of the electrodes were evaluated using a cone beam CT. All subjects underwent pure-tone audiometry tests before and after surgery, and the pure-tone average (PTA) was calculated from 250 to 4,000 Hz. RESULTS The robot inserted implants in 5 patients, and complete insertion of the electrode array was achieved. The speed of insertion of the electrode array was 0.88 ± 0.12 mm/s. The mean loss of the PTA for 5 frequencies (250, 500, 1,000, 2,000, and 4,000 Hz) was 13.60 ± 7.70 dB. Only 1 patient showed a loss of the PTA by >20 dB. For these 5 patients, the cone beam CT findings showed that all the electrode arrays were in the tympanic ramp and had a grade of 0. The results were compared with those obtained from a cohort of 17 patients who underwent manual implantation of a MED-El Flex 24-electrode array. CONCLUSION To minimize disturbance to the cochlea while atraumatic electrode arrays are inserted, electrodes can be inserted at a constant, slow speed in the inner ear with the assistance of the RobOtol® robot in a normal clinical surgical setting.
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Affiliation(s)
- Sébastien Barriat
- Department of Otorhinolaryngology, Liège University, CHU de Liège, Liège, Belgium
| | - Nicolas Peigneux
- Department of Otorhinolaryngology, Liège University, CHU de Liège, Liège, Belgium
| | - Unal Duran
- Department of Radiology, Liège University, CHU de Liège, Liège, Belgium
| | - Severine Camby
- Department of Otorhinolaryngology, Liège University, CHU de Liège, Liège, Belgium
| | - Philippe P Lefebvre
- Department of Otorhinolaryngology, Liège University, CHU de Liège, Liège, Belgium
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Clinical Utility of Intraoperative Electrocochleography (ECochG) During Cochlear Implantation: A Systematic Review and Quantitative Analysis. Otol Neurotol 2021; 42:363-371. [PMID: 33347054 DOI: 10.1097/mao.0000000000002996] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
OBJECTIVE To evaluate the utility of intraoperative electrocochleography (ECochG) as a predictive tool for preservation of residual acoustic hearing after cochlear implantation. DATA SOURCES A systematic review employing a multi-database search strategy (Ovid MEDLINE, Embase, EBM Cochrane, and Scopus) was conducted from inception to August 1, 2019. English language studies in humans were included. STUDY SELECTION All articles were independently reviewed by two authors according to Preferred Reporting Items of Systematic Reviews and Meta-analysis (PRISMA) guidelines. Studies without intraoperative ECochG obtained during cochlear implantation were excluded. DATA EXTRACTION Extracted variables included number of patients, ECochG recording technique, success rate of obtaining ECochG potentials, intraoperative changes in ECochG signal, and postoperative hearing preservation outcomes. DATA SYNTHESIS Among 537 eligible articles, 22 met inclusion criteria encompassing 498 unique patients. Ten studies featured extracochlear measurements, eight featured intracochlear measurements, and four featured both. Extracochlear ECochG had an average (SD) recording success rate of 94.9% (12.7%) while intracochlear ECochG had an average (SD) recording success rate of 91.8% (9.8%). One hundred forty five unique patients from six studies had complete intraoperative ECochG data with postoperative behavioral audiometry. After accounting for study-specific definitions of ECochG signal disturbance, worsening changes in intraoperative ECochG signal predicted postoperative hearing loss with limited sensitivity and specificity and notable heterogeneity across studies. CONCLUSIONS Intraoperative ECochG recordings can be obtained in over 90% of patients, but accuracy in predicting postoperative hearing loss remains limited. Standardization of intraoperative ECochG monitoring technique and data interpretation are necessary to more robustly investigate outcomes and refine technique.
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Hearing Preservation Outcomes With Standard Length Electrodes in Adult Cochlear Implantation and the Uptake of Electroacoustic Stimulation. Otol Neurotol 2021; 41:1060-1065. [PMID: 32569131 DOI: 10.1097/mao.0000000000002702] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
BACKGROUND Cochlear implantation with preservation of residual low-frequency hearing enables patients to utilize acoustic and electrical stimulation. It is widely accepted that preservation of residual low-frequency hearing is beneficial in both background noise and for music appreciation. The extent to which patients may benefit is not fully understood, but the importance of these concepts is reflected in electrode design developments and also refinement of surgical technique. Greater understanding is needed around factors that may affect hearing preservation. This study reports experience in adults using standard length cochlear implant arrays. OBJECTIVE The study reviews hearing preservation outcomes using the HEARRING GROUP method for factors such as gender, electrode type, insertion depth, laterality, preoperative hearing level, and time between surgery and audiogram. Furthermore, the study reviews rates of electroacoustic stimulation use in those with postoperative functional residual low-frequency hearing. METHODOLOGY Retrospective case series. INCLUSION CRITERIA preoperative ≤ 85 dB HL at 250 Hz and aged ≥ 18 years. The hearing preservation percentages were calculated using the HEARRING group formula S=[1 - ((PTApost - PTApre)/(PTAmax - PTApre))*100]%. Preservation of > 75% was considered complete, 25 to 75% partial, and 1 to 25% minimal. Standardized operative technique with facial recess approach, posterior tympanotomy, and minimally traumatic round window insertion was performed for each implant. RESULTS Fifty-three implantations in 52 patients met the inclusion criteria. The mean age at implantation was 55.5 years. The average time since the last audiogram was 10 months. The mean average total pre and postoperative pure-tone averages were 92.4 dB, 99.2 dB, respectively, using minimum reporting standards for adult cochlear Implant (CI). Thirty percent demonstrated complete hearing preservation, 35.8% partial hearing preservation, and 20.8% minimal hearing preservation. Overall, mean hearing preservation was 52.9%. Sex, age at implantation, insertion depth, lateral versus perimodiolar electrode, and preoperative hearing level did not statistically significantly affect rates of hearing preservation in our study. There was a statistically significant deterioration in hearing preservation outcomes difference at 3 months compared with 12 months postoperatively. Only two patients within our study out of 17 with functional postoperative hearing went on to use electroacoustic stimulation. CONCLUSION Hearing preservation varies between patients and postoperative outcomes are difficult to predict. This study adds to existing literature in terms of likelihood of hearing preservation following cochlear implantation. In turn, this improves our ability to counsel patients as to the chances of preserving residual low-frequency hearing postoperatively and their ability to use electroacoustic stimulation.
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Comparing Cochlear Duct Lengths Between CT and MR Images Using an Otological Surgical Planning Software. Otol Neurotol 2021; 41:e1118-e1121. [PMID: 32925847 DOI: 10.1097/mao.0000000000002777] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
OBJECTIVE We sought to examine the intra- and interobserver variability in measuring the cochlear duct length (CDL) from magnetic resonance imaging (MRI) images versus computed tomography (CT) images using an otological surgical planning software that uses measurements of the basal turn diameter and cochlear width to estimate the CDL. PATIENTS Twenty-one adult cochlear implant patients with preoperative MRI and CT images. INTERVENTION Three fellowship-trained neurotologists served as the raters in the study. One rater measured the CDL using preoperative CT scans to serve as the benchmark. Two of the raters measured the CDL on preoperative MRI scans. One rater also remeasured the scans using MRI images after a period of 1 week to assess intraobserver variability. MAIN OUTCOME MEASURE Intraclass correlational coefficients were calculated to assess for intra- and interobserver agreement. RESULTS The mean CDL measured from the CT scans was 32.7 ± 2.0 mm (range 29.4 - 37.6 mm). The mean difference between the raters when measuring the CDL using MRI scans was -0.15 ± 2.1 mm (range -3.2 to 4.3 mm). The intraclass correlational coefficients for inter-rater reliability of CDL determination using MRI scans was judged as fair to excellent (0.68; 95% CI 0.41-0.84). The intrarater reliability of CDL determination using MRI scans was judged at fair to excellent (0.73; 95% CI 0.491-0.866). CONCLUSION We demonstrate that a validated otological surgical planning software for estimating the CDL preoperatively had comparable performance using MRI scans versus the gold-standard CT scans.
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Evaluation of Insertion Forces and Cochlea Trauma Following Robotics-Assisted Cochlear Implant Electrode Array Insertion. Otol Neurotol 2021; 41:631-638. [PMID: 32604327 DOI: 10.1097/mao.0000000000002608] [Citation(s) in RCA: 44] [Impact Index Per Article: 14.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
HYPOTHESIS The objective was to evaluate the effect of cochlear implant (CI) insertion technique on electrode insertion forces and intracochlear trauma. We hypothesize that robotics-assisted insertions will reduce insertion forces and intracochlear trauma compared with manual insertions. BACKGROUND Variability in CI outcomes exists across patients, implant centers, surgeons, and electrode types. While surgical techniques that reduce electrode insertion trauma are well established, insertion trauma remains one contributing factor to variability in CI outcomes. Previous work demonstrates that micromechanically controlled insertion tools reduce both maximum insertion forces and insertion variability compared with manual insertions. METHODS CI electrode insertions were performed either by hand (n = 12) or utilizing a robotics-assisted tool (n = 12) in fresh frozen, human cadaveric cochleae using electrodes from four different CI manufacturers. Electrodes array insertion forces were additionally evaluated in benchtop cochlea models. Following cadaveric insertions, samples were imaged via high resolution x-ray microscopy to evaluate electrode position and intracochlear trauma events based on a modified Eshraghi scale. RESULTS Electrode array insertions performed by robotics-assisted system showed significantly lower insertion forces and variability. Manual electrode array insertions had a significantly higher overall trauma score of 3.1 ± 2.0 compared with 0.9 ± 1.0 for robotics-assisted insertions. Robotics-assisted insertions had higher rate of basilar membrane elevations while manual insertions showed higher rates of severe trauma events. CONCLUSIONS The robotic-assisted insertion system reduced trauma events associated with CI electrode insertions in cadaveric cochleae compared with manual insertions. Surgical devices which help to precisely and more consistently insert electrodes may improve CI outcomes and hearing preservation.
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