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Alasmi A, Saleh S, Anderson I, Abdelsamad Y, Hagr A. Validation of the Arabic language version of the Audio Processor Satisfaction Questionnaire (APSQ) for hearing implant users. PLoS One 2024; 19:e0303301. [PMID: 38857266 PMCID: PMC11164331 DOI: 10.1371/journal.pone.0303301] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2023] [Accepted: 04/23/2024] [Indexed: 06/12/2024] Open
Abstract
OBJECTIVE Audio processors (AP) are the external components of hearing implants. User satisfaction with the performance and comfort of their AP is a critical factor in ensuring daily use, which leads to improved hearing outcomes. The aim of this study was to construct and validate an Arabic language translation of the APSQ for use among Arabic-speaking clinicians and patients. DESIGN The original APSQ was translated into the Arabic language using cross-cultural adaptation measures. The final questionnaire was administered to CI users in electronic form. STUDY SAMPLE 117 CI users (64 female) participated. A total of 179 ears were assessed. RESULTS High levels of satisfaction with audio processors were observed among CI users. Item and scale analyses indicate that this version of the APSQ measure a homogeneous and valid construct. CONCLUSION The Arabic version of the APSQ captures user satisfaction with hearing implant audio processors.
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Affiliation(s)
- Abdulaziz Alasmi
- King Abdullah Ear Specialist Center (KAESC), King Abdulaziz University Hospital, King Saud University Medical City, Riyadh, Saudi Arabia
| | - Shaza Saleh
- King Abdullah Ear Specialist Center (KAESC), King Abdulaziz University Hospital, King Saud University Medical City, Riyadh, Saudi Arabia
| | - Ilona Anderson
- Clinical Research Department, MED-EL GmbH, Innsbruck, Austria
| | | | - Abdulrahman Hagr
- King Abdullah Ear Specialist Center (KAESC), King Abdulaziz University Hospital, King Saud University Medical City, Riyadh, Saudi Arabia
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Garcia A, Haleem A, Poe S, Gosh D, Christian Brown M, Herrmann BS, Lee DJ. Auditory Brainstem Implant Outcomes in Tumor and Nontumor Patients: A Systematic Review. Otolaryngol Head Neck Surg 2024; 170:1648-1658. [PMID: 38329219 DOI: 10.1002/ohn.662] [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: 12/03/2023] [Accepted: 01/13/2024] [Indexed: 02/09/2024]
Abstract
OBJECTIVE To elucidate the differences in auditory performance between auditory brainstem implant (ABI) patients with tumor or nontumor etiologies. DATA SOURCES PubMed, Embase, and Web of Science Core Collection from 1990 to 2021. REVIEW METHODS We included published studies with 5 or more pediatric or adult ABI users. Auditory outcomes and side effects were analyzed with weighted means for closed-set, open-set speech, and categories of auditory performance (CAP) scores. Overall performance was compared using an Adult Pediatric Ranked Order Speech Perception (APROSPER) scale created for this study. RESULTS Thirty-six studies were included and underwent full-text review. Data were extracted for 662 tumor and 267 nontumor patients. 83% were postlingually deafened and 17% were prelingually deafened. Studies that included tumor ABI patients had a weighted mean speech recognition of 39.2% (range: 19.6%-83.3%) for closed-set words, 23.4% (range: 17.2%-37.5%) for open-set words, 21.5% (range: 2.7%-48.4%) for open-set sentences, and 3.1 (range: 1.0-3.2) for CAP scores. Studies including nontumor ABI patients had a weighted mean speech recognition of 79.8% (range: 31.7%-84.4%) for closed-set words, 53.0% (range: 14.6%-72.5%) for open-set sentences, and 2.30 (range: 2.0-4.7) for CAP scores. Mean APROSPER results indicate better auditory performance among nontumor versus tumor patients (3.5 vs 3.0, P = .04). Differences in most common side effects were also observed between tumor and nontumor ABI patients. CONCLUSION Auditory performance is similar for tumor and nontumor patients for standardized auditory test scores. However, the APROSPER scale demonstrates better ABI performance for nontumor compared to tumor patients.
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Affiliation(s)
- Alejandro Garcia
- Department of Otolaryngology-Head and Neck Surgery, Massachusetts Eye and Ear, Harvard Medical School, Boston, Massachusetts, USA
- Eaton Peabody Laboratories (EPL), Massachusetts Eye and Ear, Boston, Massachusetts, USA
| | - Afash Haleem
- Department of Otolaryngology-Head and Neck Surgery, Massachusetts Eye and Ear, Harvard Medical School, Boston, Massachusetts, USA
- Eaton Peabody Laboratories (EPL), Massachusetts Eye and Ear, Boston, Massachusetts, USA
| | - Sonja Poe
- Department of Otolaryngology-Head and Neck Surgery, Massachusetts Eye and Ear, Harvard Medical School, Boston, Massachusetts, USA
- Eaton Peabody Laboratories (EPL), Massachusetts Eye and Ear, Boston, Massachusetts, USA
| | - Deborah Gosh
- Howe Library, Massachusetts Eye and Ear, Boston, MA, USA
| | - M Christian Brown
- Department of Otolaryngology-Head and Neck Surgery, Massachusetts Eye and Ear, Harvard Medical School, Boston, Massachusetts, USA
- Eaton Peabody Laboratories (EPL), Massachusetts Eye and Ear, Boston, Massachusetts, USA
| | - Barbara S Herrmann
- Department of Otolaryngology-Head and Neck Surgery, Massachusetts Eye and Ear, Harvard Medical School, Boston, Massachusetts, USA
- Eaton Peabody Laboratories (EPL), Massachusetts Eye and Ear, Boston, Massachusetts, USA
- Department of Audiology, Massachusetts Eye and Ear, Boston, Massachusetts, USA
| | - Daniel J Lee
- Department of Otolaryngology-Head and Neck Surgery, Massachusetts Eye and Ear, Harvard Medical School, Boston, Massachusetts, USA
- Eaton Peabody Laboratories (EPL), Massachusetts Eye and Ear, Boston, Massachusetts, USA
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Wang B, Yan M, Liu C, Yang Z, Wang X, Zhao F, Wang Z, Li P, Wang Y, Li S, Liu G, Liu P. Auditory brainstem implants for hearing rehabilitation in NF2-schwannomatosis: A systematic review and single-arm meta-analysis. NeuroRehabilitation 2024; 54:213-225. [PMID: 38427506 DOI: 10.3233/nre-230198] [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: 03/03/2024]
Abstract
BACKGROUND NF2-schwannomatosis (NF2) is an autosomal dominant disorder prone to hearing loss. Auditory brainstem implants (ABIs) offer a promising solution for hearing rehabilitation in NF2. OBJECTIVE To synthesize existing literature on ABI implantation in NF2, focusing on audiological outcomes and ABI-related complications. METHODS The systematic review followed PRISMA guidelines and was registered in the PROSPERO database (CRD42022362155). Relevant studies were identified by searching PubMed, EMBASE, CENTRAL, CMB, and CNKI from inception to August 2023. Data on environmental sound discrimination, open-set discrimination, closed-set discrimination, and ABI-related complications were extracted and subjected to meta-analysis. Publication bias was evaluated using funnel plots and Egger's test. RESULTS Thirty-three studies were included. The pooled estimate was 58% (95% CI 49-66%) for environmental sound discrimination and 55% (95% CI 40-69%) for closed-set discrimination. Regarding open-set discrimination, the pooled estimates were 30% (95% CI 19-42%) for sound only, 46% (95% CI 37-54%) for lip-reading only, and 63% (95% CI 55-70%) for sound plus lip-reading. The pooled occurrence of ABI-related complications was 33% (95% CI 15-52%). CONCLUSION This meta-analysis underscores the effectiveness and safety of ABIs in NF2, providing valuable insights for evidence-based decision-making and hearing rehabilitation strategies.
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Affiliation(s)
- Bo Wang
- Department of Neurosurgery, Beijing Tiantan Hospital, Capital Medical University, Beijing, China
| | - Minjun Yan
- Department of Neurosurgery, Beijing Tiantan Hospital, Capital Medical University, Beijing, China
| | - Congyu Liu
- School of Life Science, Tsinghua University, Beijing, China
| | - Zhijun Yang
- Department of Neurosurgery, Beijing Tiantan Hospital, Capital Medical University, Beijing, China
| | - Xingchao Wang
- Department of Neurosurgery, Beijing Tiantan Hospital, Capital Medical University, Beijing, China
| | - Fu Zhao
- Department of Neural Reconstruction, Beijing Neurosurgical Institute, Capital Medical University, Beijing, China
| | - Zhenmin Wang
- Department of Neurosurgery, Beijing Tiantan Hospital, Capital Medical University, Beijing, China
| | - Peng Li
- Department of Neurosurgery, Beijing Tiantan Hospital, Capital Medical University, Beijing, China
| | - Ying Wang
- Department of Neural Reconstruction, Beijing Neurosurgical Institute, Capital Medical University, Beijing, China
| | - Shiwei Li
- Department of Neurosurgery, Beijing Tiantan Hospital, Capital Medical University, Beijing, China
| | - Gemingtian Liu
- Department of Neurosurgery, Beijing Tiantan Hospital, Capital Medical University, Beijing, China
| | - Pinan Liu
- Department of Neurosurgery, Beijing Tiantan Hospital, Capital Medical University, Beijing, China
- Department of Neural Reconstruction, Beijing Neurosurgical Institute, Capital Medical University, Beijing, China
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Matthies C, Zeller L, Kurz A, Rak K, Hagen R, Shehata-Dieler W. Electrically evoked auditory responses: A classification for brainstem implant placement in Neurofibromatosis Type 2. Clin Neurophysiol 2023; 155:16-28. [PMID: 37659342 DOI: 10.1016/j.clinph.2023.08.005] [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: 11/23/2022] [Revised: 08/04/2023] [Accepted: 08/08/2023] [Indexed: 09/04/2023]
Abstract
OBJECTIVE In auditory brainstem implant (ABI) surgery, array placement may be optimized by electrophysiological information of adequate brainstem activation gained from electrically evoked auditory brainstem responses (EABR). This study aims 1) to characterize in detail the EABR from ABI implantation, 2) to introduce an EABR Classification Scheme, and 3) to analyze data for their correlation with individual patients' findings. METHODS Out of a continuous series of 54 patients who received an ABI between 2005 and 2019, 23 Neurofibromatosis Type 2 patients with complete documentation of 154 recordings were selected for offline analysis and for development and evaluation of a new EABR Classification Scheme comprising Class A: three vertex positive peaks, Class B:two peaks, Class C: a combination of one peak and a second melted double peak, Class D: one sole vertex positive peak and Class E: no peaks. RESULTS All 23 subjects showed EABR at final ABI position and experienced auditory sensations at first activation. The most frequent morphology consisted of two peaks, Classes B and C. Identified mean latencies were for P1 0.42 ms (±0.095), P2 1.42 ms (±0.244) and P3 2.41 ms (±0.329). Peak latencies correlated positively with tumor extensions (p < 0.005). CONCLUSIONS This study provides clear instructions on optimal EABR performance and evaluation. SIGNIFICANCE The new EABR Classification Scheme relies on a fast "online" identification of vertex positive peaks at the estimated post-artifact phase. The variability in EABR morphology provides an individual snapshot of the actual structural and functional status of the brainstem.
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Affiliation(s)
- Cordula Matthies
- Department of Neurosurgery, Würzburg University Hospital, Würzburg, Germany.
| | - Laura Zeller
- Department of Neurosurgery, Würzburg University Hospital, Würzburg, Germany
| | - Anja Kurz
- Department of Otorhinolaryngology, Plastic, Aesthetic and Reconstructive Head and Neck Surgery, Würzburg University Hospital, Würzburg, Germany
| | - Kristen Rak
- Department of Otorhinolaryngology, Plastic, Aesthetic and Reconstructive Head and Neck Surgery, Würzburg University Hospital, Würzburg, Germany
| | - Rudolf Hagen
- Department of Otorhinolaryngology, Plastic, Aesthetic and Reconstructive Head and Neck Surgery, Würzburg University Hospital, Würzburg, Germany
| | - Wafaa Shehata-Dieler
- Department of Otorhinolaryngology, Plastic, Aesthetic and Reconstructive Head and Neck Surgery, Würzburg University Hospital, Würzburg, Germany
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McClenaghan F, Freeman S, Lloyd S, Stapleton E. Cochlear Implantation in Sporadic Vestibular Schwannoma and Neurofibromatosis Type II. Otolaryngol Clin North Am 2023; 56:587-598. [PMID: 37019773 DOI: 10.1016/j.otc.2023.02.017] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/05/2023]
Abstract
Cochlear implantation offers significantly better hearing outcomes than auditory brainstem implantation in patients with vestibular schwannoma. Neither the primary treatment modality nor the cause of the tumor (neurofibromatosis type 2 related or sporadic) seems to have a significant effect on hearing outcome with cochlear implantation. Some uncertainty remains regarding long-term hearing outcomes; however, cochlear implantation in vestibular schwannoma serves to offer patients, with a functioning cochlear nerve, the probability of open set speech discrimination with a consequent positive impact on quality of life.
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Patel NS, Carlson ML, Link MJ, Neff BA, Van Gompel JJ, Driscoll CLW. Cochlear implantation after radiosurgery for vestibular schwannoma. J Neurosurg 2021; 135:126-135. [PMID: 34250789 DOI: 10.3171/2020.4.jns201069] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
OBJECTIVE The object of this study was to ascertain outcomes of cochlear implantation (CI) following stereotactic radiosurgery (SRS) for vestibular schwannoma (VS). METHODS The authors conducted a retrospective chart review of adult patients with VS treated with SRS who underwent CI between 1990 and 2019 at a single tertiary care referral center. Patient demographics, tumor features, treatment parameters, and pre- and postimplantation audiometric and clinical outcomes are presented. RESULTS Seventeen patients (18 ears) underwent SRS and ipsilateral CI during the study period. Thirteen patients (76%) had neurofibromatosis type 2 (NF2). Median age at SRS and CI were 44 and 48 years, respectively. Median time from SRS to CI was 60 days, but notably, 4 patients underwent SRS and CI within 1 day and 5 patients underwent CI more than 7 years after SRS. Median marginal dose was 13 Gy. Median treatment volume at the time of SRS was 1400 mm3 (range 84-6080 mm3, n = 15 patients). Median post-CI PTA was 28 dB HL, improved from 101 dB HL preoperatively (p < 0.001). Overall, 11 patients (12 ears) exhibited open-set speech understanding. Sentence testing was performed at a median of 10 months (range 1-143 months) post-CI. The median AzBio sentence score for patients with open-set speech understanding was 76% (range 19%-95%, n = 10 ears). Two ears exhibited Hearing in Noise Test (HINT) sentence scores of 49% and 95%, respectively. Four patients achieved environmental sound awareness without open-set speech recognition. Two had no detectable auditory percepts. CONCLUSIONS Most patients who underwent CI following SRS for VS enjoyed access to sound at near-normal levels, with the majority achieving good open-set speech understanding. Implantation can be performed immediately following SRS or in a delayed fashion, depending on hearing status as well as other factors. This strategy may be applied to cases of sporadic or NF2-associated VS. ABBREVIATIONS AAO-HNS = American Academy of Otolaryngology-Head and Neck Surgery; ABI = auditory brainstem implant; CI = cochlear implantation; CN = cranial nerve; CNC = consonant-nucleus-consonant; CPA = cerebellopontine angle; EPS = electrical promontory stimulation; ESA = environmental sound awareness; HINT = Hearing in Noise Test; IAC = internal auditory canal; NF2 = neurofibromatosis type 2; OSP = open-set speech perception; PTA = pure tone average; SRS = stereotactic radiosurgery; VS = vestibular schwannoma; WRS = word recognition score.
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Affiliation(s)
- Neil S Patel
- 1Department of Otolaryngology-Head and Neck Surgery, and
| | - Matthew L Carlson
- 1Department of Otolaryngology-Head and Neck Surgery, and
- 2Department of Neurologic Surgery, Mayo Clinic, Rochester, Minnesota
| | - Michael J Link
- 1Department of Otolaryngology-Head and Neck Surgery, and
- 2Department of Neurologic Surgery, Mayo Clinic, Rochester, Minnesota
| | - Brian A Neff
- 1Department of Otolaryngology-Head and Neck Surgery, and
| | - Jamie J Van Gompel
- 1Department of Otolaryngology-Head and Neck Surgery, and
- 2Department of Neurologic Surgery, Mayo Clinic, Rochester, Minnesota
| | - Colin L W Driscoll
- 1Department of Otolaryngology-Head and Neck Surgery, and
- 2Department of Neurologic Surgery, Mayo Clinic, Rochester, Minnesota
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Abstract
The Auditory Brainstem Implant (ABI) is based on the classic cochlear implant (CI) but uses a different stimulation electrode. At MED-EL, the early development activities on ABI started in the year 1994, with the suggestion coming from J. Helms and J. Müller from Würzburg, Germany in collaboration with the Univ. of Innsbruck Austria. The first ABI surgery in a neuro-fibromatosis (NF2) patient with the MED-EL device took place in the year 1997. Later, the indication of ABI was expanded to non-NF2 patients with severe inner-ear malformation, for whom a regular CI will not be beneficial. Key translational research activities at MED-EL in collaboration with numerous clinics investigating the factors that affect the hearing performance amongst ABI patients, importance of early ABI implantation in children, tools in pre-operative assessment of ABI candidates and new concepts that were pursued with the MED-EL ABI device. The CE-mark for the MED-EL ABI to be used in adults and children down to the age of 12 months without NF-2 was granted in 2017 mainly based on two long-term clinical studies in the pediatric population. This article covers the milestones of translational research from the first concept to the widespread clinical use of ABI in association with MED-EL.
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Affiliation(s)
| | - Ingeborg Hochmair
- MED-EL Elektromedizinische Geraete Gesellschaft m.b.H., Innsbruck, Austria
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Taslimi S, Zuccato JA, Mansouri A, Hachem LD, Badhiwala J, Kuchta J, Chen J, Pirouzmand F. Novel Statistical Analyses to Assess Hearing Outcomes After ABI Implantation in NF2 Patients: Systematic Review and Individualized Patient Data Analysis. World Neurosurg 2019; 128:e669-e682. [PMID: 31059859 DOI: 10.1016/j.wneu.2019.04.232] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2019] [Revised: 04/26/2019] [Accepted: 04/27/2019] [Indexed: 10/26/2022]
Abstract
BACKGROUND Patients with neurofibromatosis type 2 develop bilateral vestibular schwannomas with progressive hearing loss. Auditory brainstem implants (ABIs) stimulate hearing in the cochlear nuclei and show promise in improving hearing. Here, we assess the impact of ABI on hearing over time by systematically reviewing the literature and re-analyzing available individual patient data. METHODS A multidatabase search identified 3 studies with individual patient data of longitudinal hearing outcomes after ABI insertion in adults. Data were collected on hearing outcomes of different sound complexities from sound to speech using an ABI ± lip reading ability plus demographic data. Because of heterogeneity each study was analyzed separately using random effects multilevel mixed linear modeling. RESULTS Across all 3 studies (n = 111 total) there were significant improvements in hearing over time from ABI placement (P < 0.000 in all). Improvements in comprehension of sounds, words, sentences, and speech occurred over time with ABI use + lip reading but lip reading ability did not improve over time. All categories of hearing complexity had over 50% comprehension after over 1 year of ABI use and some subsets had over 75% or near 100% comprehension. Vowel comprehension was greater than consonant, and word comprehension was greater than sentence comprehension (P < 0.0001 in both). Age and sex did not predict outcomes. CONCLUSIONS ABIs improve hearing beyond lip reading alone, which represents baseline patient function prior to treatment, and the benefits continue to improve with time. These findings may be used to guide patient counseling regarding ABI insertion, rehabilitation course after insertion, and future studies.
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Affiliation(s)
- Shervin Taslimi
- Division of Neurosurgery, Department of Surgery, University of Toronto, Toronto, Ontario, Canada
| | - Jeffrey A Zuccato
- Division of Neurosurgery, Department of Surgery, University of Toronto, Toronto, Ontario, Canada.
| | - Alireza Mansouri
- Division of Neurosurgery, Department of Surgery, University of Toronto, Toronto, Ontario, Canada
| | - Laureen D Hachem
- Division of Neurosurgery, Department of Surgery, University of Toronto, Toronto, Ontario, Canada
| | - Jetan Badhiwala
- Division of Neurosurgery, Department of Surgery, University of Toronto, Toronto, Ontario, Canada
| | - Johannes Kuchta
- Department of Neurosurgery, University of Cologne, Köln, Germany
| | - Joseph Chen
- Department of Otolaryngology, Sunnybrook Health Science Centre, Toronto, Ontario, Canada
| | - Farhad Pirouzmand
- Division of Neurosurgery, Department of Surgery, Sunnybrook Health Science Centre, Toronto, Ontario, Canada
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Jung NY, Kim M, Chang WS, Jung HH, Choi JY, Chang JW. Favorable Long-Term Functional Outcomes and Safety of Auditory Brainstem Implants in Nontumor Patients. Oper Neurosurg (Hagerstown) 2017; 13:653-660. [PMID: 29186598 DOI: 10.1093/ons/opx046] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2016] [Accepted: 02/16/2017] [Indexed: 11/14/2022] Open
Abstract
BACKGROUND Auditory brainstem implants (ABIs) were designed to restore hearing in deaf patients with auditory tumors or those unable to receive cochlear implants. Although ABIs may help some patients, their long-term outcomes have been rarely studied. OBJECTIVE To assess the long-term benefits and safety of ABIs in nontumor patients with sensorineural hearing loss (SNHL). METHODS We retrospectively reviewed the histories of 15 deaf patients (8 females, 7 males; mean age, 15.5 yr; range, 1-56 yr) who received ABIs for treatment of SNHL at our hospital from July 2008 to November 2015. These included 11 children with narrow internal auditory canals and 4 deaf adults with severe cochlear ossification. In each patient, a 12-channel ABI electrode was placed in the cochlear nucleus complex via a retrosigmoid approach. Auditory performance was evaluated using the Categories of Auditory Performance (CAP) index and sound detection and word identification tests. RESULTS One year after ABI placement, 13 of 15 patients showed adequate or significantly improved auditory function based on the CAP scores at the last follow-up. Generally, adult patients tended to show better CAP scores (3.50) than pediatric patients (2.15), but the difference was not significant (P = .058). Postoperative complications included electrode migration, cerebrospinal fluid leakage, nonauditory stimulation, and minor seizures without severe sequelae or mortality. CONCLUSION ABIs show favorable functional outcomes and long-term safety in nontumor deaf patients with limited treatment options. Collectively, our data indicate that ABIs represent an important treatment option for SNHL.
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Affiliation(s)
- Na Young Jung
- Department of Neurosurgery, Yonsei University College of Medicine, Seoul, Republic of Korea
| | - Minsoo Kim
- Department of Neurosurgery, Yonsei University College of Medicine, Seoul, Republic of Korea
| | - Won Seok Chang
- Department of Neurosurgery, Yonsei University College of Medicine, Seoul, Republic of Korea
| | - Hyun Ho Jung
- Department of Neurosurgery, Yonsei University College of Medicine, Seoul, Republic of Korea
| | - Jae Young Choi
- Department of Otorhinolaryngology, Yonsei University College of Medicine, Seoul, Republic of Korea
| | - Jin Woo Chang
- Department of Neurosurgery, Yonsei University College of Medicine, Seoul, Republic of Korea
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North HJD, Mawman D, O'Driscoll M, Freeman SR, Rutherford SA, King AT, Hammerbeck-Ward C, Evans DG, Lloyd SKW. Outcomes of cochlear implantation in patients with neurofibromatosis type 2. Cochlear Implants Int 2017; 17:172-177. [PMID: 27691934 DOI: 10.1080/14670100.2016.1197587] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Abstract
In neurofibromatosis type 2 (NF2) bilateral vestibular schwannomas (VS) or their treatment usually results in bilateral hearing loss. Cochlear implantation (CI) was traditionally not used in these patients due to concern that retrocochlear disease would render the implant ineffective. This paper describes the auditory outcomes of CI in 13 patients with NF2 and includes patients with untreated VS and patients undergoing VS removal with cochlear nerve preservation. The non-user rate was 7.7%. Of the active users, median CUNY score was 98%, median BKB score in quiet was 90% and median BKB score in noise was 68%. CI is a viable option in selected patients with NF2.
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Affiliation(s)
- Hannah J D North
- a Department of Otolaryngology , Salford Royal NHS Foundation Trust , Manchester M6 8HD , UK
| | - Deborah Mawman
- b The Richard Ramsden Centre for Auditory Implants, Central Manchester University Hospitals NHS Foundation Trust, Manchester Academic Health Science Centre , Manchester M13 9WL , UK
| | - Martin O'Driscoll
- b The Richard Ramsden Centre for Auditory Implants, Central Manchester University Hospitals NHS Foundation Trust, Manchester Academic Health Science Centre , Manchester M13 9WL , UK
| | - Simon R Freeman
- a Department of Otolaryngology , Salford Royal NHS Foundation Trust , Manchester M6 8HD , UK.,b The Richard Ramsden Centre for Auditory Implants, Central Manchester University Hospitals NHS Foundation Trust, Manchester Academic Health Science Centre , Manchester M13 9WL , UK
| | - Scott A Rutherford
- c Department of Neurosurgery , Salford Royal NHS Foundation Trust , Manchester M6 8HD , UK
| | - Andrew T King
- c Department of Neurosurgery , Salford Royal NHS Foundation Trust , Manchester M6 8HD , UK
| | | | - D Gareth Evans
- d Manchester Centre for Genomic Medicine, University of Manchester, Manchester Academic Health Science Centre , Manchester M13 9WL , UK.,e Institute of Cancer Sciences, University of Manchester , UK
| | - Simon K W Lloyd
- a Department of Otolaryngology , Salford Royal NHS Foundation Trust , Manchester M6 8HD , UK.,b The Richard Ramsden Centre for Auditory Implants, Central Manchester University Hospitals NHS Foundation Trust, Manchester Academic Health Science Centre , Manchester M13 9WL , UK.,e Institute of Cancer Sciences, University of Manchester , UK
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11
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Auditory Brainstem Implantation in Neurofibromatosis Type 2: Experience From the Manchester Programme. Otol Neurotol 2017; 37:1267-74. [PMID: 27525707 DOI: 10.1097/mao.0000000000001166] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
OBJECTIVE To describe the experience of auditory brainstem implantation (ABI) in patients with Neurofibromatosis type 2 (NF2). STUDY DESIGN Retrospective case review. SETTING Tertiary referral centre. PATIENTS Implanted with a Cochlear ABI22 or ABI24M between 1994 and 2009 because of NF2 disease. INTERVENTION(S) Rehabilitative. MAIN OUTCOME MEASURE(S) Surgical complication rate; audiological outcomes. RESULTS There were 50 primary ABI insertions in 49 patients, including 16 inserted at the time of first side tumor removal as a sleeper, and two revision repositionings which failed to improve outcome. Postoperatively three patients had cerebrospinal fluid leaks which did not require reoperation, one patient had meningitis, and eleven patients suffered either temporary or permanent lower cranial nerve dysfunction. Twenty-nine patients became full time users; a further 12 patients became non-users. Three patients died while their device was inactive. Five patients retain serviceable contralateral hearing. Audiological open set testing of users showed means of: environmental sounds discrimination 51%; phoneme discrimination: with ABI alone 22%/lip reading (LR) 45%/ABI with LR 65%; sentence testing: with ABI alone 13%/LR 19%/ABI with LR 54%. CONCLUSIONS The majority of patients with NF2 implanted with an ABI find the device a useful aid to communication in conjunction with LR and in recognizing common environmental sounds. A small proportion gain open set discrimination. Almost a third of patients may end up as non-users. There is probably an increased risk of postoperative lower cranial nerve dysfunction so careful preoperative assessment is advised.
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Lloyd SKW, King AT, Rutherford SA, Hammerbeck-Ward CL, Freeman SRM, Mawman DJ, O'Driscoll M, Evans DG. Hearing optimisation in neurofibromatosis type 2: A systematic review. Clin Otolaryngol 2017; 42:1329-1337. [PMID: 28371358 DOI: 10.1111/coa.12882] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/23/2017] [Indexed: 01/04/2023]
Abstract
BACKGROUND It is common for patients with neurofibromatosis type 2 to develop bilateral profound hearing loss hearing loss, and this is one of the main determinants of quality of life in this patient group. OBJECTIVES The aim of this systematic review was to review the current literature regarding hearing outcomes of treatments for vestibular schwannomas in neurofibromatosis type 2 including conservative and medical management, radiotherapy, hearing preservation surgery and auditory implantation in order to determine the most effective way of preserving or rehabilitating hearing. SEARCH STRATEGY A MESH search in PubMed using search terms (('Neurofibromatosis 2' [Mesh]) AND 'Neuroma, Acoustic'[Mesh]) AND 'Hearing Loss' [Mesh] was performed. A search using keywords was also performed. Studies with adequate hearing outcome data were included. With the exception of the cochlear implant studies (cohort size was very small), case studies were excluded. EVALUATION METHOD The GRADE system was used to assess quality of publication. Formal statistical analysis of data was not performed because of very heterogenous data reporting. RESULTS Conservative management offers the best chance of hearing preservation in stable tumours. The use of bevacizumab probably improves the likelihood of hearing preservation in growing tumours in the short term and is probably more effective than hearing preservation surgery and radiotherapy in preserving hearing. Of the hearing preservation interventions, hearing preservation surgery probably offers better hearing preservation rates than radiotherapy for small tumours but recurrence rates for hearing preservation surgery were high. For patients with profound hearing loss, cochlear implantation provides significantly better auditory outcomes than auditory brainstem implantation. Patients with untreated stable tumours are likely to achieve the best outcomes from cochlear implantation. Those who have had their tumours treated with surgery or radiotherapy do not gain as much benefit from cochlear implantation than those with untreated tumours. CONCLUSIONS This review summarises the current literature related to hearing preservation/rehabilitation in patients with NF2. Whilst it provides indicative data, the quality of the data was low and should be interpreted with care. It is also important to consider that the management of vestibular schwannomas in NF2 is complex and decision-making is determined by many factors, not just the need to preserve hearing.
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Affiliation(s)
- S K W Lloyd
- Department of Otolaryngology, Salford Royal Hospital NHS Foundation Trust, Manchester, UK.,Department of Otolaryngology, Central Manchester NHS Foundation Trust, Manchester Academic Health Science Centre, Manchester, UK.,School of Medical Sciences, University of Manchester, Manchester, UK
| | - A T King
- Department of Neurosurgery, Salford Royal Hospital NHS Foundation Trust, Manchester, UK
| | - S A Rutherford
- Department of Neurosurgery, Salford Royal Hospital NHS Foundation Trust, Manchester, UK
| | - C L Hammerbeck-Ward
- Department of Neurosurgery, Salford Royal Hospital NHS Foundation Trust, Manchester, UK
| | - S R M Freeman
- Department of Otolaryngology, Salford Royal Hospital NHS Foundation Trust, Manchester, UK.,Department of Otolaryngology, Central Manchester NHS Foundation Trust, Manchester Academic Health Science Centre, Manchester, UK
| | - D J Mawman
- Richard Ramsden Auditory Implant Centre, Central Manchester NHS Foundation Trust, Manchester, UK
| | - M O'Driscoll
- Richard Ramsden Auditory Implant Centre, Central Manchester NHS Foundation Trust, Manchester, UK
| | - D G Evans
- Department of Genomic Medicine, Central Manchester University Hospitals NHS Foundation Trust, Manchester Academic Health Science Centre, Manchester, UK
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Roberts DS, Slattery WH, Chen BS, Otto SR, Schwartz MS, Lekovic GP. 'Compassionate use' protocol for auditory brainstem implantation in neurofibromatosis type 2: Early House Ear Institute experience. Cochlear Implants Int 2017; 18:57-62. [PMID: 28098509 DOI: 10.1080/14670100.2016.1258203] [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: 10/20/2022]
Abstract
OBJECTIVE To report the preliminary outcomes of auditory brainstem implantation (ABI) under a compassionate use protocol for two ABI devices that are not approved by the US Food and Drug Administration. METHODS A retrospective review was performed of neurofibromatosis type 2 (NF2) patients who underwent microsurgery for vestibular schwannoma (VS) and placement of either the Cochlear ABI541 or Med-El Synchrony ABIs. Peri-operative and device- related complications were reviewed. Audiometric performance was also evaluated. RESULTS Seven patients received either the Cochlear ABI541 (6) or the Med-El Synchrony ABI (1) after the resection of VS. No device or patient-related complications occurred to date. Surgical times and early audiological performance are similar to our previous experience with the Cochlear ABI24 device. CONCLUSIONS Early experience with the Cochlear ABI541 and Med-El Synchrony ABI devices under a compassionate use protocol suggest that both devices are safe with comparable utility to the Cochlear ABI24 device.
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Affiliation(s)
- Daniel S Roberts
- a House Clinic and House Ear Institute , 2100 West 3rd Street, Los Angeles , CA 90057 , USA.,b University of Connecticut School of Medicine , 263 Farmington Avenue, Farmington , CT 06030 , USA
| | - William H Slattery
- a House Clinic and House Ear Institute , 2100 West 3rd Street, Los Angeles , CA 90057 , USA
| | - Brian S Chen
- a House Clinic and House Ear Institute , 2100 West 3rd Street, Los Angeles , CA 90057 , USA.,c Department of Otolarygology, Head and Neck Surgery , William Beaumont Army Medical Center , El Paso , TX 79920 , USA
| | - Steve R Otto
- a House Clinic and House Ear Institute , 2100 West 3rd Street, Los Angeles , CA 90057 , USA
| | - Marc S Schwartz
- a House Clinic and House Ear Institute , 2100 West 3rd Street, Los Angeles , CA 90057 , USA
| | - Gregory P Lekovic
- a House Clinic and House Ear Institute , 2100 West 3rd Street, Los Angeles , CA 90057 , USA
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14
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Huo Z, Zhang Z, Huang Q, Yang J, Wang Z, Li Y, Huang M, Wu H. Hearing Restoration for Adults with Vestibular Schwannoma in the Only Hearing Ear: Ipsilateral or Contralateral Cochlear Implantation? ORL J Otorhinolaryngol Relat Spec 2016; 78:281-288. [DOI: 10.1159/000451003] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2016] [Accepted: 09/21/2016] [Indexed: 11/19/2022]
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15
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Schwartz MS, Wilkinson EP. Auditory brainstem implant program development. Laryngoscope 2016; 127:1909-1915. [PMID: 27716925 DOI: 10.1002/lary.26312] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 08/10/2016] [Indexed: 11/06/2022]
Abstract
OBJECTIVE Auditory brainstem implants (ABIs), which have previously been used to restore auditory perception to deaf patients with neurofibromatosis type 2 (NF2), are now being utilized in other situations, including treatment of congenitally deaf children with cochlear malformations or cochlear nerve deficiencies. Concurrent with this expansion of indications, the number of centers placing and expressing interest in placing ABIs has proliferated. Because ABI placement involves posterior fossa craniotomy in order to access the site of implantation on the cochlear nucleus complex of the brainstem and is not without significant risk, we aim to highlight issues important in developing and maintaining successful ABI programs that would be in the best interests of patients. DATA SOURCES Especially with pediatric patients, the ultimate benefits of implantation will be known only after years of growth and development. These benefits have yet to be fully elucidated and continue to be an area of controversy. The limited number of publications in this area were reviewed. REVIEW METHODS Review of the current literature was performed. RESULTS Disease processes, risk/benefit analyses, degrees of evidence, and U.S. Food and Drug Administration approvals differ among various categories of patients in whom auditory brainstem implantation could be considered for use. CONCLUSION We suggest sets of criteria necessary for the development of successful and sustaining ABI programs, including programs for NF2 patients, postlingually deafened adult nonneurofibromatosis type 2 patients, and congenitally deaf pediatric patients. Laryngoscope, 127:1909-1915, 2017.
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Affiliation(s)
- Marc S Schwartz
- House Clinic, Neurosurgery and Huntington Medical Research Institutes, Los Angeles, California, U.S.A
| | - Eric P Wilkinson
- House Clinic and Huntington Medical Research Institutes, Los Angeles, California, U.S.A
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16
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Wang ZM, Yang ZJ, Zhao F, Wang B, Wang XC, Qu PR, Liu PN. Auditory Rehabilitation in Rhesus Macaque Monkeys (Macaca mulatta) with Auditory Brainstem Implants. Chin Med J (Engl) 2016; 128:1363-9. [PMID: 25963359 PMCID: PMC4830318 DOI: 10.4103/0366-6999.156783] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
Abstract
Background: The auditory brainstem implants (ABIs) have been used to treat deafness for patients with neurofibromatosis Type 2 and nontumor patients. The lack of an appropriate animal model has limited the study of improving hearing rehabilitation by the device. This study aimed to establish an animal model of ABI in adult rhesus macaque monkey (Macaca mulatta). Methods: Six adult rhesus macaque monkeys (M. mulatta) were included. Under general anesthesia, a multichannel ABI was implanted into the lateral recess of the fourth ventricle through the modified suboccipital-retrosigmoid (RS) approach. The electrical auditory brainstem response (EABR) waves were tested to ensure the optimal implant site. After the operation, the EABR and computed tomography (CT) were used to test and verify the effectiveness via electrophysiology and anatomy, respectively. The subjects underwent behavioral observation for 6 months, and the postoperative EABR was tested every two weeks from the 1st month after implant surgery. Result: The implant surgery lasted an average of 5.2 h, and no monkey died or sacrificed. The averaged latencies of peaks I, II and IV were 1.27, 2.34 and 3.98 ms, respectively in the ABR. One-peak EABR wave was elicited in the operation, and one- or two-peak waves were elicited during the postoperative period. The EABR wave latencies appeared to be constant under different stimulus intensities; however, the amplitudes increased as the stimulus increased within a certain scope. Conclusions: It is feasible and safe to implant ABIs in rhesus macaque monkeys (M. mulatta) through a modified suboccipital RS approach, and EABR and CT are valid tools for animal model establishment. In addition, this model should be an appropriate animal model for the electrophysiological and behavioral study of rhesus macaque monkey with ABI.
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Affiliation(s)
| | | | | | | | | | | | - Pi-Nan Liu
- Department of Neurosurgery, Beijing Tiantan Hospital, Capital Medical University; Department of Neural Reconstruction, Beijing Neurosurgical Institute, Beijing 100050, China
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17
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Schwartz MS. Letters to the Editor. Auditory brainstem implants in neurofibromatosis Type 2. J Neurosurg 2014; 121:760-1. [DOI: 10.3171/2014.3.jns14490] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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18
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Straka MM, McMahon M, Markovitz CD, Lim HH. Effects of location and timing of co-activated neurons in the auditory midbrain on cortical activity: implications for a new central auditory prosthesis. J Neural Eng 2014; 11:046021. [PMID: 25003629 DOI: 10.1088/1741-2560/11/4/046021] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
OBJECTIVE An increasing number of deaf individuals are being implanted with central auditory prostheses, but their performance has generally been poorer than for cochlear implant users. The goal of this study is to investigate stimulation strategies for improving hearing performance with a new auditory midbrain implant (AMI). Previous studies have shown that repeated electrical stimulation of a single site in each isofrequency lamina of the central nucleus of the inferior colliculus (ICC) causes strong suppressive effects in elicited responses within the primary auditory cortex (A1). Here we investigate if improved cortical activity can be achieved by co-activating neurons with different timing and locations across an ICC lamina and if this cortical activity varies across A1. APPROACH We electrically stimulated two sites at different locations across an isofrequency ICC lamina using varying delays in ketamine-anesthetized guinea pigs. We recorded and analyzed spike activity and local field potentials across different layers and locations of A1. RESULTS Co-activating two sites within an isofrequency lamina with short inter-pulse intervals (<5 ms) could elicit cortical activity that is enhanced beyond a linear summation of activity elicited by the individual sites. A significantly greater extent of normalized cortical activity was observed for stimulation of the rostral-lateral region of an ICC lamina compared to the caudal-medial region. We did not identify any location trends across A1, but the most cortical enhancement was observed in supragranular layers, suggesting further integration of the stimuli through the cortical layers. SIGNIFICANCE The topographic organization identified by this study provides further evidence for the presence of functional zones across an ICC lamina with locations consistent with those identified by previous studies. Clinically, these results suggest that co-activating different neural populations in the rostral-lateral ICC rather than the caudal-medial ICC using the AMI may improve or elicit different types of hearing capabilities.
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Affiliation(s)
- Małgorzata M Straka
- Department of Biomedical Engineering, University of Minnesota, Twin Cities 312 Church St SE, Minneapolis, MN 55455, USA
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Ozdek A, Bayır O, Dönmez T, Ozışık P, Sahin M, Tulgar M, Tatar EÇ, Korkmaz MH. Hearing restoration in NF2 patients and patients with vestibular schwannoma in the only hearing ear: report of two cases. Am J Otolaryngol 2014; 35:538-41. [PMID: 24746329 DOI: 10.1016/j.amjoto.2014.03.014] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2014] [Revised: 03/03/2014] [Accepted: 03/16/2014] [Indexed: 11/17/2022]
Abstract
OBJECTIVE To explore audiologic outcome of auditory brain stem implantation (ABI) and cochlear implantation (CI) in NF2 patients and patients with vestibular schwannoma (VS) in the only hearing ear. PATIENTS AND METHODS Study includes retrospective analysis of 2 cases. One is totally deaf patient due to NF2, and the other one is totally deaf due to VS development in only hearing ear. Tumor was removed by retrosigmoid approach in NF2 patient and ABI was performed simultaneously. For the VS in only hearing ear case, tumor was removed by translabyrinthine approach and CI was performed simultaneously. RESULTS ABI patient showed quite well outcome during the 15 months of follow-up. She has 25 dB hearing threshold at speaking frequencies. She developed open set speech discrimination with 87.5% word discrimination score, and 70% sentence discrimination score. She uses device daily manner, she can use telephone. For CI patient, outcome is not perfect but satisfactory. She couldn't develop open set speech discrimination during the 18 months of follow-up. She has 67% the disyllabic words recognition score (close set). She is daily user of device. CI improves quite well lip reading. CONCLUSION ABI and CI are the two options to restore hearing in VS caused deafness. We advocate giving every effort to preserve cochlear nerve during the VS resection and place CI simultaneously. However if it is not possible to preserve cochlear nerve during surgery, ABI is also a good alternative for hearing restoration.
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Affiliation(s)
- Ali Ozdek
- Ministry of Health, Dışkapı Yıldırım Beyazıt Research Hospital, Department of Otolaryngology, Ankara, Turkey; Karabük University, Department of Otolaryngology, Karabük, Turkey
| | - Omer Bayır
- Ministry of Health, Dışkapı Yıldırım Beyazıt Research Hospital, Department of Otolaryngology, Ankara, Turkey.
| | - Teoman Dönmez
- Ministry of Health, Dışkapı Yıldırım Beyazıt Research Hospital, Department of Neurosurgery, Ankara, Turkey
| | - Pınar Ozışık
- Ministry of Health, Dışkapı Yıldırım Beyazıt Research Hospital, Department of Neurosurgery, Ankara, Turkey
| | - Mustafa Sahin
- Ministry of Health, Dışkapı Yıldırım Beyazıt Research Hospital, Department of Otolaryngology, Ankara, Turkey
| | - Meltem Tulgar
- Ministry of Health, Dışkapı Yıldırım Beyazıt Research Hospital, Department of Otolaryngology, Ankara, Turkey
| | - Emel Çadallı Tatar
- Ministry of Health, Dışkapı Yıldırım Beyazıt Research Hospital, Department of Otolaryngology, Ankara, Turkey
| | - Mehmet Hakan Korkmaz
- Ministry of Health, Dışkapı Yıldırım Beyazıt Research Hospital, Department of Otolaryngology, Ankara, Turkey; Yıldırım Beyazıt University, Department of Otolaryngology, Ankara, Turkey
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Mallory GW, Pollock BE, Foote RL, Carlson ML, Driscoll CL, Link MJ. Stereotactic Radiosurgery for Neurofibromatosis 2—Associated Vestibular Schwannomas. Neurosurgery 2013; 74:292-300; discussion 300-1. [DOI: 10.1227/neu.0000000000000264] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Abstract
Abstract
BACKGROUND:
Management of neurofibromatosis type 2 (NF2)—associated vestibular schwannomas (VSs) remains controversial. Stereotactic radiosurgery (SRS) with conventional dosing is less effective for NF2-related VS compared with sporadic lesions.
OBJECTIVE:
To evaluate optimal SRS dose parameters for NF2-related VS and to report long-term outcomes.
METHODS:
A prospective database was reviewed and outcome measures, including radiographic progression, American Academy of Otolaryngology—Head and Neck Surgery hearing class, and facial nerve function, were analyzed. Progression-free survival was estimated with Kaplan-Meier methods. Associations between tumor progression and radiosurgical treatment parameters, tumor volume, and patient age were explored with the use of Cox proportional hazards regression.
RESULTS:
Between 1990 and 2010, 26 patients with 32 NF2-related VSs underwent SRS. Median marginal dose and tumor volume were 14 Gy and 2.7 cm3, respectively. Twenty-seven tumors (84%) showed no growth (median follow-up, 7.6 years). Kaplan-Meier estimates for 5- and 10-year progression-free survival were 85% and 80%, respectively. Cox proportional hazards demonstrated a significant inverse association between higher marginal doses and tumor progression (hazard ratio, 0.49; 95% confidence interval, 0.17-0.92; P = .02). Audiometric data were available in 30 ears, with 12 having class A/B hearing before SRS. Only 3 maintained serviceable hearing at the last follow-up. Four underwent cochlear implantation. Initially, 3 achieved open-set speech recognition, although only 1 experienced long-term benefit. Facial nerve function remained stable in 50% of cases.
CONCLUSION:
Higher marginal doses than commonly prescribed for sporadic VS were associated with improved tumor control in patients with NF2. Hearing outcomes were poor even when contemporary reduced marginal doses were used. However, SRS allows an anatomically preserved cochlear nerve and may permit hearing rehabilitation with cochlear implantation. Further consideration should be given to optimum dosing to achieve long-term control while maximizing functional outcomes.
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Affiliation(s)
- Grant W. Mallory
- Departments of Neurologic Surgery, Mayo Clinic School of Medicine, Rochester, Minnesota
| | - Bruce E. Pollock
- Departments of Neurologic Surgery, Mayo Clinic School of Medicine, Rochester, Minnesota
- Radiation Oncology, Mayo Clinic School of Medicine, Rochester, Minnesota
| | - Robert L. Foote
- Radiation Oncology, Mayo Clinic School of Medicine, Rochester, Minnesota
| | - Matthew L. Carlson
- Otolaryngology—Head and Neck Surgery, Mayo Clinic School of Medicine, Rochester, Minnesota
| | - Colin L. Driscoll
- Departments of Neurologic Surgery, Mayo Clinic School of Medicine, Rochester, Minnesota
- Otolaryngology—Head and Neck Surgery, Mayo Clinic School of Medicine, Rochester, Minnesota
| | - Michael J. Link
- Departments of Neurologic Surgery, Mayo Clinic School of Medicine, Rochester, Minnesota
- Otolaryngology—Head and Neck Surgery, Mayo Clinic School of Medicine, Rochester, Minnesota
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