Radiological parameters related to success of the round window approach in cochlear implantation: A retrospective study

2018 ◽  
Vol 43 (6) ◽  
pp. 1535-1540 ◽  
Author(s):  
Jae-Yoon Kang ◽  
Jee-Hye Chung ◽  
Hee-Sung Park ◽  
Yong-Ho Park ◽  
Jin Woong Choi
Keyword(s):  
Retrospective Study ◽  
Cochlear Implantation ◽  
Round Window ◽  
Radiological Parameters ◽  
Window Approach

Surgical considerations during cochlear implantation: the utility of temporal bone computed tomography

2021 ◽  
pp. 1-8
Author(s):  
Beomcho Jun ◽  
Sunwha Song
Keyword(s):  
Computed Tomography ◽  
Temporal Bone ◽  
Cochlear Implantation ◽  
Round Window ◽  
Three Dimensional ◽  
Electrode Placement ◽  
Posterior Tympanotomy ◽  
Electrode Insertion ◽  
Window Approach ◽  
Bone Structures

Abstract Objective This paper describes the construction of portals for electrode placement during cochlear implantation and emphasises the utility of pre-operative temporal bone three-dimensional computed tomography. Methods Temporal bone three-dimensional computed tomography was used to plan portal creation for electrode insertion. Results Pre-operative temporal bone three-dimensional computed tomography can be used to determine the orientation of temporal bone structures, which is important for mastoidectomy, posterior tympanotomy and cochleostomy, and when using the round window approach. Conclusion It is essential to create appropriate portals (from the mastoid cortex to the cochlea) in a step-by-step manner, to ensure the safe insertion of electrodes into the scala tympani. Pre-operative three-dimensional temporal bone computed tomography is invaluable in this respect.

scholarly journals Vestibular Preservation After Cochlear Implantation Using the Round Window Approach

2021 ◽  
Vol 12 ◽  
Author(s):  
Keita Tsukada ◽  
Shin-ichi Usami
Keyword(s):  
Cochlear Implantation ◽  
Round Window ◽  
Surgical Techniques ◽  
Vestibular Function ◽  
Vestibular Evoked Myogenic Potential ◽  
Flexible Electrodes ◽  
Caloric Testing ◽  
Before And After ◽  
Window Approach ◽  
Caloric Response

Background: The development of less traumatic surgical techniques, such as the round window approach (RWA), as well as the use of flexible electrodes and post-operative steroid administration have enabled the preservation of residual hearing after cochlear implantation (CI) surgery. However, consideration must still be given to the complications that can accompany CI. One such potential complication is the impairment of vestibular function with resulting vertigo symptoms. The aim of our current study was to examine the changes in vestibular function after implantation in patients who received CI using less traumatic surgery, particularly the RWA technique.Methods: Sixty-six patients who received CI in our center were examined by caloric testing, cervical vestibular evoked myogenic potential (cVEMP) and ocular VEMP (oVEMP) before or after implantation, or both, to obtain data on semicircular canal, saccular and utricular function, respectively. Less traumatic CI surgery was performed by the use of the RWA and insertion of flexible electrodes such as MED-EL FLEX soft, FLEX 28, and FLEX 24 (Innsbruck, Austria).Results: Caloric response and the asymmetry ratio of cVEMP and oVEMP were examined before and after implantation using less traumatic surgical techniques. Compared with before implantation, 93.9, 82.4, and 92.5% of the patients showed preserved vestibular function after implantation based on caloric testing, cVEMP and oVEMP results, respectively. We also examined the results for vestibular function by a comparison of the 66 patients using the RWA and flexible electrodes, and 17 patients who underwent cochleostomy and insertion of conventional or hard electrodes. We measured responses using caloric testing, cVEMP and oVEMP in patients after CI. There were no differences in the frequencies of abnormal caloric and oVEMP results in the implanted ears between the RWA and cochleostomy. On the other hand, the frequency of abnormal cVEMP responses in the implanted ears in the patients who received implantation by cochleostomy was significantly higher than that in the patients undergoing surgery using the RWA.Conclusion: Patients receiving CI using less traumatic surgical techniques such as RWA and flexible electrodes have reduced risk of damage to vestibular function.

Postural control before and after cochlear implantation: Standard cochleostomy versus round window approach

2009 ◽  
Vol 130 (6) ◽  
pp. 696-701 ◽  
Author(s):  
Heinz-Dieter Kluenter ◽  
Ruth Lang-Roth ◽  
Dirk Beutner ◽  
Karl-Bernd Hüttenbrink ◽  
Orlando Guntinas-Lichius
Keyword(s):  
Postural Control ◽  
Cochlear Implantation ◽  
Round Window ◽  
Before And After ◽  
Window Approach

The Effect of Systemic Steroid on Hearing Preservation After Cochlear Implantation via Round Window Approach

2017 ◽  
Vol 38 (7) ◽  
pp. 962-969 ◽  
Author(s):  
Mun Young Chang ◽  
Yoon Chan Rah ◽  
Jun Jae Choi ◽  
Shin Wook Woo ◽  
Yu-Jung Hwang ◽  
...  
Keyword(s):  
Cochlear Implantation ◽  
Round Window ◽  
Hearing Preservation ◽  
Systemic Steroid ◽  
Window Approach

Effect of Round Window Opening Size on Residual Hearing Preservation in Cochlear Implantation

2020 ◽  
Vol 163 (2) ◽  
pp. 375-381
Author(s):  
Giselle L. Gotamco ◽  
Chuan-Hung Sun ◽  
Yi-Fan Chou ◽  
Chuan-Jen Hsu ◽  
Hung-Pin Wu
Keyword(s):  
Cochlear Implantation ◽  
Round Window ◽  
Hearing Preservation ◽  
Round Window Membrane ◽  
Tertiary Referral ◽  
Tertiary Referral Center ◽  
Window Technique ◽  
Cochlear Implant Surgery ◽  
Window Opening ◽  
Window Approach

Objectives This study aims to compare the hearing preservation outcomes in cochlear implant surgery following slit versus full opening of the round window membrane. Setting Tertiary referral center. Study Design Comparative study. Subjects and Methods Seventy patients (mean, 26.3 years; range, 2-69 years) who underwent cochlear implantation via the round window approach were included in the study. Thirty-five subjects were prospectively enrolled for cochlear implantation via the open round window technique between August 2018 and January 2019. Thirty-five patients who underwent cochlear implantation from January 2017 to July 2018 via the slit round window opening, frequency matched by sex and age, were retrospectively enrolled. Pre- and postoperative thresholds were obtained. The percentage of hearing preservation was computed with the HEARRING Network formula and classified into complete, partial, and minimal hearing preservation. The results between the groups were compared and analyzed at 6 months postoperatively. Results The rate of complete hearing preservation in the open group was statistically significant ( P = .030) at 71.4% (n = 25) as compared with 45.7% (n = 16) in the slit group. Conclusions The widely opened round window may be an optional technique that surgeons can utilize to improve hearing preservation outcomes.

Cochlear implant placement: round window approach

2014 ◽  
Vol 36 (v1supplement) ◽  
pp. 1 ◽  
Author(s):  
Douglas D. Backous
Keyword(s):  
Clinical Trials ◽  
Surgical Technique ◽  
Cochlear Implant ◽  
Cochlear Implantation ◽  
Round Window ◽  
Hearing Preservation ◽  
Residual Hearing ◽  
Implant Placement ◽  
Single Sided Deafness ◽  
Window Approach

The indications for cochlear implantation continue to extend to patients with increased levels of residual hearing. Single-sided deafness and tinnitus are currently under various clinical trials as even further expansion of the application of cochlear implant device and programming technology is underway. This video details a round window and hearing preservation approach for cochlear implant placement, and incorporates the most recent advances in surgical technique.The video can be found here: http://youtu.be/bDqkbboXrU4.

Endoscopic visualisation of the round window during cochlear implantation

2020 ◽  
Vol 134 (3) ◽  
pp. 219-221 ◽  
Author(s):  
A Jain ◽  
R Sharma ◽  
J C Passey ◽  
R Meher ◽  
R Bansal
Keyword(s):  
Middle Ear ◽  
Cochlear Implantation ◽  
Round Window ◽  
Electrode Array ◽  
Round Window Membrane ◽  
Window Region ◽  
Round Window Niche ◽  
Window Approach ◽  
Maximum Exposure

AbstractBackgroundEndoscopes provide a magnified view of the middle ear and visualisation of hidden areas. Otoendoscopes facilitate excellent visualisation of the round window niche during cochlear implantation.ObjectiveTo compare microscopic and endoscopic visualisation of the round window membrane during cochlear implantation in 20 patients.MethodsTwenty patients who underwent cochlear implantation were included in the study. After maximum exposure of the round window, the accessibility of the round window membrane was graded according to the St Thomas Hospital classification, first by microscope and then by endoscope.ResultsWith the use of the endoscope, visualisation of the round window membrane improved in all the patients as compared to the microscope. The electrode array was inserted via a round window or extended round window approach in all but two cases; the latter cases required bony cochleostomy because of unfavourable anatomy.ConclusionThe main benefit of endoscope-assisted cochlear implantation is improved visibility of the round window region.

scholarly journals Vestibular Function in Children and Adults Before and After Unilateral or Sequential Bilateral Cochlear Implantation

2021 ◽  
Vol 12 ◽  
Author(s):  
Ruirui Guan ◽  
Yanqi Wang ◽  
Sasa Wu ◽  
Bo Zhang ◽  
Jingwu Sun ◽  
...  
Keyword(s):  
Cochlear Implantation ◽  
Round Window ◽  
Low Frequency ◽  
Vestibular Function ◽  
Head Impulse Test ◽  
Caloric Test ◽  
Vestibular Evoked Myogenic Potential ◽  
Before And After ◽  
Adults And Children ◽  
Window Approach

Background: Cochlear implantation (CI) helps patients with severe or profound sensorineural hearing loss (SNHL) restore hearing and speech abilities. However, some patients exhibit abnormal vestibular functions with symptoms such as dizziness or balance disorders, after CI. Whether age at CI and CI approach (unilateral or sequential bilateral) affect vestibular functions in users with cochlear implants remains unclear.Objectives: To investigate the vestibular functions in children and adults before and after unilateral or sequential bilateral CI.Materials and Methods: Thirty-seven patients with severe or profound SNHL who were candidates for a first- or second-side CI were divided into three groups: first-side CI-implanted adults (≥18 years), first-side CI-implanted children (6–17 years), and second-side CI-implanted children (6–17 years). All cases were implanted with the round window approach to minimize damage to the intra-cochlear structures. The caloric test, vestibular evoked myogenic potential (VEMP) test, video head impulse test (vHIT), Dizziness Handicap Inventory (DHI), Pediatric Vestibular Symptom Questionnaire (PVSQ), and audiometric tests were performed before and 1 month after CI.Results: The abnormal rates of caloric test and VEMP test after CI in the first-side CI-implanted adults and children significantly increased compared with those before CI. The pre-implantation VEMP test showed significantly higher abnormal rates between first- and second-side CI-implanted children. No other significant differences of abnormal rates between first- and second-side CI-implanted children or between first-side CI-implanted adults and children were found. In second-side CI-implanted children, PVSQ scores significantly increased at day 3 post-implantation but decreased at day 30.Conclusion: CI has a negative effect on the results of caloric and VEMP tests, but not on vHIT, indicating that the otolith and low-frequency semicircular canal (SCC) are more vulnerable to damage from CI. The alterations of vestibular functions resulting from CI surgery may be independent of age at CI and CI approach (unilateral or sequential bilateral). Long-term impacts on the vestibular function from CI surgery, as well as the chronic electrical stimulation to the cochlea, are still to be investigated.

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