Document Details

Document Type : Thesis 
Document Title :
HIGH FREQUENCIES STIMULATION OF THE BASAL TURN OF THE COCHLEA IN ROUND WINDOW VERSUS COCHLEOSTOMY INSERTION IN COCHLEAR IMPLANT PATIENTS
مقارنة تحفيز عالي التردد للجزء القاعدي من القوقعة في حالات الزراعة من خلال النافذة المستديرة مقابل الفغر القوقعي في مرضى زراعة القوقعة.
 
Subject : Faculty of Medicine 
Document Language : Arabic 
Abstract : Background: Advances in electrode designs have expanded the indications of cochlear implants to involve patients with residual hearing; hence, a traumatic surgery is inescapable. For this purpose, two major approaches have been proposed, including the cochleostomy and the round window approach. In both techniques, the tissue response to intracochlear electrode array is marked by fibrosis. Moreover, it has been shown that tissue-to-electrode interface and the distance of the electrode from the modiolar wall (radial distance) have significant effects on this process. The distance is wider for the basal electrodes than for the apical ones, which would vary the electrode position between the different surgical approaches and affects cochlear mechanics in this area, and that can be measured indirectly by means of impedence field telemetry (IFT) and maximum comfortable level (MCL). The aim of this study is to explore the effect of the surgical approach used for electrode insertion on the electrical auditory stimulation of the basal turn of cochlea (high frequency stimulation) by means of Impedance and MCL. Methodology: Thirty-one patients (mean age=8.7 years) with cochlear implant were enrolled, 16 were implanted through cochleostomy and 15 through round window insertion. All included patients were implanted with the same devices and operated by the same surgeon with standard posterior tympanotomy technique. Impedance and MCL for the last four basal electrodes were measured after an average of 1-year postoperative time. Results: Mean impedance values were higher in the cochleostomy group than in the round window group, yet this difference was not statistically significant. Similarly, mean MCL values were higher among cochleostomy group and the result was not statistically significant (p=0.05); however, this difference was significant for a 10% margin error. Conclusion: Our study finding suggests likelihood of superiority of round window insertion technique over cochleostomy; however, the level of statistical significance does not enable generalization of the result. 
Supervisor : Prof. Khaled Alnoury 
Thesis Type : Master Thesis 
Publishing Year : 1440 AH
2019 AD 
Added Date : Thursday, September 12, 2019 

Researchers

Researcher Name (Arabic)Researcher Name (English)Researcher TypeDr GradeEmail
سحر حسين مدخليMadkhaly, Sahar HussainResearcherMaster 

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