Effect of unilateral cochlear implant use on contralateral electrically evoked auditory brainstem responses to round window membrane electrical stimulation

2021 ◽  
pp. 1-6
Author(s):  
Jun-Ge Zhang ◽  
Li Chen ◽  
Ping Li ◽  
Jing-Wu Sun ◽  
Xiao-Tao Guo ◽  
...  
Keyword(s):  
Electrical Stimulation ◽  
Cochlear Implant ◽  
Round Window ◽  
Auditory Brainstem ◽  
Auditory Brainstem Responses ◽  
Round Window Membrane

scholarly journals Peran implanted electrically evoked auditory brainstem responses(Imp-eABR) pada pasien tuli kongenital

2019 ◽  
Vol 49 (20) ◽  
Author(s):  
Fikri Mirza Putranto ◽  
Jenny Bashiruddin ◽  
Semiramis Zizlavsky ◽  
Irawan Mangunatmadja ◽  
Jacub Pandelaki ◽  
...  
Keyword(s):  
Electrical Stimulation ◽  
Cochlear Implant ◽  
Hearing Aids ◽  
Auditory Pathway ◽  
Auditory Brainstem ◽  
Cochlear Nerve ◽  
Auditory Brainstem Responses ◽  
Auditory Pathways ◽  
Internal Factors ◽  
Brainstem Response

Latar belakang: Variasi performa pasca implan koklea menunjukkan adanya variasi patologi yang belum dapat dijelaskan melalui pemeriksaan standar pra-operasi. Untuk itu dibutuhkan pemeriksaan yang dapat menunjukkan variasi integritas jaras auditori sebagai petunjuk variasi potensi internal tiap individu. Tujuan: Mendapatkan variasi respons jaras auditori terhadap stimulus listrik pasca implan berdasarkan pemeriksaan Implanted Electrically evoked Auditory Brainstem Respons (Imp-eABR), serta korelasinya dengan faktor internal pra-implan lain berupa usia, luas area n. koklearis dan kemampuan komunikasi pra-operasi. Metode: Kriteria subjek penelitian adalah pasien operasi implan koklea berusia kurang dari 10 tahun, memiliki koklea dan n. koklearis normal, dan pada pasien berusia lebih dari 4 tahun sudah memakai alat bantu dengar minimal 1 tahun. Pemeriksaan Imp-eABR dilakukan terhadap 5 elektrode yang mewakili area apikal, medial dan basal koklea. Dicari hubungan respons dari stimulasi terhadap ketiga faktor internal.Hasil:Pemeriksaan Imp-eABR dilakukan terhadap 28 telinga dari 19 pasien yang dilakukan operasi secara unilateral dan bilateral. Rerata skor total respons Imp-eABR adalah 6,3 + 2,63; dengan 60,7% telinga memiliki skor total kurang dari 8. Uji regresi linear menunjukkan faktor usia, luas area n. koklearis dan kemampuan komunikasi berkorelasi secara bermakna dan dapat memprediksi variasi skor Imp-eABR sebanyak 49,2%. Kesimpulan:Variasi skor total Imp-eABR pada pasien dengan faktor internal pra-operasi menunjukkan adanya patogenesis lain yang mendasari kemampuan transmisi jaras pendengaran retrokoklea terhadap stimulasi listrik dari implan koklea. Faktor internal pra-operasi dapat menjelaskan kurang dari 50% variasi respons Imp-eABR. Kata kunci: Imp-eABR, luas area n. koklearis, implant koklea, integritas jaras auditori ABSTRACT Background:Variations in performance after cochlear implant indicates pathology variations that cannot be explained through standard preoperative examination. Therefore, an examination is needed to show variations in the integrity of auditory pathways as a guide to internal potential variations of each individual. Objectives: To show variations of auditory pathways responses to electrical stimulation from cochlear implant by performing Implanted Electrically evoked Auditory Brainstem Response (Imp-eABR) examination and to find its correlation to age, cochlear nerve area and preoperative communication skills. Methods: Subjects were cochlear implant patients with age less than 10 years, had normal cochlear and cochlear nerve,and patients over 4 years old with history of wearing hearing aids for at least 1 year. The Imp-eABR examination was performed to 5 electrodes representing the apical, medial and basal areas of the cochlea. Results:Imp-eABR examination was performed on 28 ears from 19 patients who underwent unilateral and bilateral surgery. The average total score of Imp-eABR responses was 6.3 + 2.63; with 60.7% of the ears having a total score of less than 8. Linear regression tests showed age,cochlear nerve area,andcommunicationabilitysignificantlycorrelate,it canexplain49.2%ofthevariationinthetotal Imp-eABR score. Conclusion: The variation in the total Imp-eABR score in patients with preoperative internal factors indicated that another pathogenesis also underlines the ability of transmission of the retrocochlear auditory pathway to electrical stimulation from the cochlear implant. Preoperative internal factors can only explain less than 50% of the variation of the Imp-eABR response.   

scholarly journals The Effects of Round Window Membrane Injury and the Use of a Model Electrode Application on Hearing in Rats

2021 ◽  
pp. 014556132199018
Author(s):  
Murat Koc ◽  
Abdullah Dalgic ◽  
Mehmet Ziya Ozuer
Keyword(s):  
Hearing Loss ◽  
Cochlear Implant ◽  
Round Window ◽  
Mechanical Trauma ◽  
Round Window Membrane ◽  
Albino Rats ◽  
Topical Steroids ◽  
Distortion Product ◽  
Significant Difference ◽  
Group 3

Objective: To investigate the effects of the mechanical trauma to the round window, a model electrode inserted into the scala tympani on the cochlear reserve, and the efficacy of topical steroids in preventing hearing loss. Materials and Methods: 21 male Wistar Albino rats were equally categorized into three groups. In all groups an initial mechanical injury to round window was created. Only subsequent dexamethasone injection was administrated into the cochlea in the subjects of group 2 while a multichannel cochlear implant guide inserted into the cochlea prior to dexamethasone administration for group 3. Distortion product otoacoustic emissions (DPOAEs) were obtained prior to and immediately after the surgical injury, eventually on postoperative seventh day (d 7). Mean signal/noise ratios (S/Ns) obtained at 2000, 3000, and 4000 Hz were calculated. Data sets were compared with non-parametric statistical tests. Results: The early intraoperative mean S/Ns were significantly less than preoperative measurements for group 1 and 2; however, preoperative and postoperative d 7 average S/Ns did not differ. There was statistically significant difference between preoperative, intraoperative and postoperative d 7 average S/Ns for group 3. Conclusion: We observed that hearing was restored approximately to the preoperative levels following early postoperative repair. However, an electrode insertion into the cochlea via round window subsequent to mechanical trauma seems to cause a progressive hearing loss. Therefore, a special care must be taken to avoid the injury to the round window membrane in the course of the placement of a cochlear implant electrode and surgery for the chronic otitis media.

scholarly journals Consecutive Treatment with Brain-Derived Neurotrophic Factor and Electrical Stimulation Has a Protective Effect on Primary Auditory Neurons

2020 ◽  
Vol 10 (8) ◽  
pp. 559 ◽  
Author(s):  
Verena Scheper ◽  
Ira Seidel-Effenberg ◽  
Thomas Lenarz ◽  
Timo Stöver ◽  
Gerrit Paasche
Keyword(s):  
Electrical Stimulation ◽  
Neurotrophic Factor ◽  
Combined Treatment ◽  
Spiral Ganglion ◽  
Brain Derived Neurotrophic Factor ◽  
Auditory Brainstem ◽  
Contralateral Side ◽  
Auditory Brainstem Responses ◽  
Drug Delivery Device ◽  
Ganglion Neurons

Degeneration of neurons, such as the inner ear spiral ganglion neurons (SGN), may be decelerated or even stopped by neurotrophic factor treatment, such as brain-derived neurotrophic factor (BDNF), as well as electrical stimulation (ES). In a clinical setting, drug treatment of the SGN could start directly during implantation of a cochlear implant, whereas electrical stimulation begins days to weeks later. The present study was conducted to determine the effects of consecutive BDNF and ES treatments on SGN density and electrical responsiveness. An electrode drug delivery device was implanted in guinea pigs 3 weeks after deafening and five experimental groups were established: two groups received intracochlear infusion of artificial perilymph (AP) or BDNF; two groups were treated with AP respectively BDNF in addition to ES (AP + ES, BDNF + ES); and one group received BDNF from the day of implantation until day 34 followed by ES (BDNF ⇨ ES). Electrically evoked auditory brainstem responses were recorded. After one month of treatment, the tissue was harvested and the SGN density was assessed. The results show that consecutive treatment with BDNF and ES was as successful as the simultaneous combined treatment in terms of enhanced SGN density compared to the untreated contralateral side but not in regard to the numbers of protected cells.

scholarly journals Intraoperative Monitoring of the Cochlear Nerve during Neurofibromatosis Type-2 Vestibular Schwannoma Surgery and Description of a “Test Intracochlear Electrode”

2019 ◽  
Vol 80 (01) ◽  
pp. e1-e9 ◽  
Author(s):  
Anand Kasbekar ◽  
Yu Chuen Tam ◽  
Robert Carlyon ◽  
John Deeks ◽  
Neil Donnelly ◽  
...  
Keyword(s):  
Cochlear Implant ◽  
Vestibular Schwannoma ◽  
Intraoperative Monitoring ◽  
Neurofibromatosis Type ◽  
Auditory Brainstem ◽  
Cochlear Nerve ◽  
Auditory Brainstem Responses ◽  
Tertiary Referral Center ◽  
Objective Evidence ◽  
Brainstem Response

Objectives A decision on whether to insert a cochlear implant can be made in neurofibromatosis 2 (NF2) if there is objective evidence of cochlear nerve (CN) function post vestibular schwannoma (VS) excision. We aimed to develop intraoperative CN monitoring to help in this decision. Design We describe the intraoperative monitoring of a patient with NF2 and our stimulating and recording set up. A novel test electrode is used to stimulate the CN electrically. Setting This study was set at a tertiary referral center for skull base pathology. Main outcome measure Preserved auditory brainstem responses leading to cochlear implantation. Results Electrical auditory brainstem response (EABR) waveforms will be displayed from different stages of the operation. A cochlear implant was inserted at the same sitting based on the EABR. Conclusion Electrically evoked CN monitoring can provide objective evidence of CN function after VS excision and aid in the decision-making process of hearing rehabilitation in patients who will be rendered deaf.

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