Variations in Cochlear Size of Cochlear Implant Candidates

Zahara, Devira; Dewi, Rima Diana; Aboet, Askaroellah; Putranto, Fikri Mirza; Lubis, Netty Delvrita; Ashar, Taufik

doi:10.1055/s-0038-1661360

Cited by 28 publications

(23 citation statements)

References 35 publications

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“…In this systematic review, the data were obtained from 56 studies 2–5,11,12,14–17,19,20,22–26,28–30,32–37,39–45,53–74 . However, there were 65 different subgroups.…”

Section: Resultsmentioning

confidence: 99%

Comprehensive Analysis of Factors Affecting Cochlear Size: A Systematic Review and Meta‐analysis

et al. 2021

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Objectives To determine the cochlea's average size in humans and evaluate the relationships between certain covariates and cochlear size. Methods A systematic search on articles on cochlear size and published in English was conducted using Cochrane, PubMed, Web of Science, and Scopus databases up to September 15, 2020. Data were pooled using random‐effects with three models. The effect of demographic, clinical, and measurement‐related parameters was specifically analyzed. Meta‐regression and subgroup analyses were conducted. The overall effect estimation was made for outcomes. Results The meta‐analysis included 4,708 cochleae from 56 studies. The overall length of the organ of Corti was 32.94 mm (95% confidence interval [CI]: 32.51–33.38). The first and second models revealed that age, gender, country, continent, measurement method (direct, indirect), measured structure (“A” value, cochlear lateral wall), origin (in vivo, in vitro), and type (histology specimens, plastic casts, imaging) of the cochlear material did not affect the cochlear size. However, study populations (general population, patients with a cochlear implant, and patients with congenital sensorineural hearing loss [CSNHL]) were found to affect the outcomes. Compared to the other populations, patients with CSNHL had shorter cochleae. Therefore, we developed a third model and found that the general population and patients with cochlear implants did not differ in cochlear size. Conclusion This meta‐analysis investigated the factors that could affect the cochlear size and found that patients with CSNHL had significantly shorter cochleae, whereas other covariates had no significant effect. Laryngoscope, 132:188–197, 2022

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“…In this systematic review, the data were obtained from 56 studies 2–5,11,12,14–17,19,20,22–26,28–30,32–37,39–45,53–74 . However, there were 65 different subgroups.…”

Section: Resultsmentioning

confidence: 99%

Comprehensive Analysis of Factors Affecting Cochlear Size: A Systematic Review and Meta‐analysis

et al. 2021

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“…The variability of cochlear length 11,35–38 between individuals and the potential for personalized preoperative assessment to improve clinical outcomes has motivated several methods to estimate the CDL. Historically, histologic direct measurements were the first method to analyze the CDL and its variability 39 .…”

Section: Discussionmentioning

confidence: 99%

“…Each step is completely automated to avoid introducing the error and variability that arise in many of the previously reported methods that rely on manual landmark identification. 11,[35][36][37] The automated system is also fast and efficient, scalable, and does not require specialized training to perform. These considerations represent a substantiative advantage of the system presented over existing automated methods.…”

Section: Discussionmentioning

confidence: 99%

Fully Automated Measurement of Cochlear Duct Length From Clinical Temporal Bone Computed Tomography

et al. 2021

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Objectives/Hypothesis: To present and validate a novel fully automated method to measure cochlear dimensions, including cochlear duct length (CDL).Study Design: Cross-sectional study.Methods: The computational method combined 1) a deep learning (DL) algorithm to segment the cochlea and otic capsule and 2) geometric analysis to measure anti-modiolar distances from the round window to the apex. The algorithm was trained using 165 manually segmented clinical computed tomography (CT). A Testing group of 159 CTs were then measured for cochlear diameter and width (A-and B-values) and CDL using the automated system and compared against manual measurements. The results were also compared with existing approaches and historical data. In addition, pre-and postimplantation scans from 27 cochlear implant recipients were studied to compare predicted versus actual array insertion depth.Results: Measurements were successfully obtained in 98.1% of scans. The mean CDL to 900 was 35.52 mm (SD, 2.06; range, [30.91-40.50]), the mean A-value was 8.88 mm (0.47; [7.67-10.49]), and mean B-value was 6.38 mm (0.42; [5.16-7.38]). The R 2 fit of the automated to manual measurements was 0.87 for A-value, 0.70 for B-value, and 0.71 for CDL. For anti-modiolar arrays, the distance between the imaged and predicted array tip location was 0.57 mm (1.25; [0.13-5.28]). Conclusion:Our method provides a fully automated means of cochlear analysis from clinical CTs. The distribution of CDL, dimensions, and cochlear quadrant lengths is similar to those from historical data. This approach requires no radiographic experience and is free from user-related variation.

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“…Recently, Zahara et al 13 and Grover et al 14 reported on the cochlear size variation by measuring both A value and B value within the Indian and Indonesian population, respectively. Alanazi and Alzhrani 15 reported on the cochlear size variation between Saudi and non-Saudi populations just by measuring the A value.…”

Section: Discussionmentioning

confidence: 99%

Shape of the Cochlear Basal Turn: An Indicator for an Optimal Electrode-to-Modiolus Proximity With Precurved Electrode Type

et al. 2020

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Objective: The objective of this study was to determine the shape of cochlear basal turn through basic cochlear parameters measurement. The secondary aim was to overlay an image of the precurved electrode array on top of the three-dimensional (3D) image of the cochlea to determine which shape of the cochlear basal turn gives optimal electrode-to-modiolus proximity. Materials and Methods: Computed tomography (CT) preoperative image-data sets of 117 ears were made available for the measurements of cochlear parameters retrospectively. Three-dimensional slicer was used in the visualization and measurement of cochlear parameters from both 3D and 2D (2-dimensional) images of the inner ear. Cochlear parameters including basal turn diameter ( A), width of the basal turn ( B), and cochlear height (H) were measured from the appropriate planes. B/ A ratio was made to investigate which ratios correspond to round and elliptical shape of the cochlear basal turn. Results: The cochlear size as measured by A value ranged between 7.4 mm and 10 mm. The B value and the cochlear height ( H) showed a weak positive linear relation with A value. The ratio between the B and A values anything above or below 0.75 could be an indicator for a more round- or elliptical shaped cochlear basal turn, respectively. One sized/shaped commercially available precurved electrode array would not offer a tight electrode-to-modiolus in the cochlea that has an elliptical shaped basal turn as identified by the B/A ratio of <0.75. Conclusion: Accurate measurement of cochlear parameters adds value to the overall understanding of the cochlear geometry before a cochlear implantation procedure. The shape of cochlear basal turn could have clinical implications when comes to electrode-to-modiolus proximity.

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Variations in Cochlear Size of Cochlear Implant Candidates

Cited by 28 publications

References 35 publications

Comprehensive Analysis of Factors Affecting Cochlear Size: A Systematic Review and Meta‐analysis

Comprehensive Analysis of Factors Affecting Cochlear Size: A Systematic Review and Meta‐analysis

Fully Automated Measurement of Cochlear Duct Length From Clinical Temporal Bone Computed Tomography

Shape of the Cochlear Basal Turn: An Indicator for an Optimal Electrode-to-Modiolus Proximity With Precurved Electrode Type

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