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Int Arch Otorhinolaryngol. 2019 Apr;23(2):184-190. doi: 10.1055/s-0038-1661360. Epub 2018 Oct 24.

Variations in Cochlear Size of Cochlear Implant Candidates.

Author information

1
Department of Otorhinolaryngology - Head and Neck Surgery, Faculty of Medicine, Universitas Sumatera Utara, Medan, Sumatera Utara, Indonesia.
2
Department of Otorhinolaryngology - Head and Neck Surgery, Faculty of Medicine, and Health Sciences, Universitas Islam Negeri Syarif Hidayatullah Jakarta, Jakarta, Indonesia.
3
Department of Radiology, Faculty of Medicine, Universitas Sumatera Utara, Medan, Sumatera Utara, Indonesia.
4
Department of Environmental Health, Faculty of Public Health, Universitas Sumatera Utara, Medan, Sumatera Utara, Indonesia.

Abstract

Introduction  The cochlear anatomy varies in each individual, and that has an impact on decisions regarding the insertion of electrodes. The measurement of the cochlear size is the routine examination required to choose the proper cochlear implant (CI) electrodes. Objective  To acquire normative data on the size of the cochlea (length, width, height, scala timpani [ST] height, cochlear duct length [CDL]) of CI candidates in Medan, Indonesia. Methods  This descriptive study was conducted based on high-resolution computed tomography (HRCT) temporal bone data and on HRCT temporal data manipulated to reconstruct three-dimensional (3D) multiplanar images with OsiriX MD DICOM Viewer version 9.5.1 (Pixmeo SARL, Bernex, Geneva, Switzerland) viewer of 18 patients (36 ears) who were CI candidates in Medan, Indonesia, in order to determine cochlear length (A), cochlear width, cochlear height, ST height and CDL, calculated through a simple mathematical function. Results  The average cochlear length (A) was 8.75 mm (standard deviation [SD] = 0.31 mm); the average cochlear width was 6.53 mm (SD = 0.35 mm); the average cochlear height was 3.26 mm (SD = 0.24 mm) and the average ST height at the basal cochlea was 1.00 mm (SD = 0.1 mm); and 0.71 mm (SD = 0.1 mm) at the half turn of cochlea. The average total CDL was 32.45 mm (SD = 1.31 mm; range: 30.01-34.83 mm). Conclusion  The cochlear size varies in each individual; therefore, the temporal bone measurement of CI candidates using HRCT is essential: for the selection of suitable implant electrodes; to minimize cochlear damages at the insertion of the electrode arrays; and to maximize the hearing improvements.

KEYWORDS:

cochlea; cochlear implant; computed tomography; temporal bone

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