Estimation of outer-wall length in optimizing cochlear implantation in malformed inner ears.

Autor: Alshalan A; Department of Otolaryngology-Head and Neck Surgery, College of Medicine, Jouf University, PO Box 72418 , Skaka, Aljouf, 23235, Saudi Arabia. amalshalan@ju.edu.sa., Abdelsamad Y; Research Department, MED-EL, Riyadh, Saudi Arabia., Alahmadi A; Maternity and Children Hospital, Makkah, Saudi Arabia., Santoro F; Universita Campus Bio-Medico di Roma, Rome, Italy., Alhabib S; King Abdullah Ear Specialist Center (KAESC), College of Medicine, King Saud University, Riyadh, Saudi Arabia., Almuhawas F; King Abdullah Ear Specialist Center (KAESC), College of Medicine, King Saud University, Riyadh, Saudi Arabia., Alzhrani F; King Abdullah Ear Specialist Center (KAESC), College of Medicine, King Saud University, Riyadh, Saudi Arabia., Alsanosi A; King Abdullah Ear Specialist Center (KAESC), College of Medicine, King Saud University, Riyadh, Saudi Arabia., Dhanasingh A; Research and Development, MED-EL, Innsbruck, Austria.
Jazyk: angličtina
Zdroj: Scientific reports [Sci Rep] 2024 Nov 09; Vol. 14 (1), pp. 27308. Date of Electronic Publication: 2024 Nov 09.
DOI: 10.1038/s41598-024-77991-6
Abstrakt: Estimation of cochlear length is gaining attention in the field of cochlear implants (CIs), mainly for selecting of CI electrode lengths. The currently available tools to estimate the cochlear duct length (CDL) are only valid for normal inner anatomy. However, inner ear malformation (IEM) types are associated with different degrees of cystic apices, limiting the application of CDL equations of normal anatomy inner ear. Therefore, this study aimed to understand the degree to which the outer wall (OW) is observed in different malformation types and to formulate mathematical equations to estimate the OW length (OWL) from cochlear parameters, namely the basal turn diameter (A-value) and width (B-value). Three-dimensional (3D) segmentation of promontory and fluid parts of the inner ear was performed to understand the extent to which the OW is visible to measure the OWL manually. Enlarged vestibular aqueduct syndrome (EVAS) was diagnosed in 37 ears, which consistently showed the extent of the OW to an angular depth of 540°, beyond which the cystic apex starts. Incomplete partition (IP) type I was observed in 30 ears, with the OW extending to only 360° of angular depth. IP type II was observed in 35 ears, with the OW extending to 450° of angular depth. IP type III was identified in 24 ears, with the OW observed for 540° of angular depth. Cavity-type malformations were observed in 36 ears, and circumference was measured in the axial view. A strong positive linear correlation was observed between the manually measured OWL and cochlear parameters for all malformation types analyzed. A multiple linear regression model was applied to formulate mathematical equations, which was further used to create a software application for estimating OWLs in IEM types, using cochlear parameters as inputs.
(© 2024. The Author(s).)
Databáze: MEDLINE
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