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Assessing the Placement of the Cochlear Slim Perimodiolar Electrode Array by Trans Impedance Matrix Analysis: A Temporal Bone Study

New cochlear implant (CI) electrode arrays provide softer insertion dynamics; however, due to their high flexibility, the possibilities of fold-overs or intraoperative displacements must be taken into account. The position of each individual electrode can only be determined by using high-resolution...

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Autores principales: Ramos de Miguel, Ángel, Riol Sancho, Diego, Falcón-González, Juan Carlos, Pavone, Joana, Rodríguez Herrera, Leandro, Borkoski Barreiro, Silvia, Falcón Benitez, Nadia, Ramos Macias, Ángel
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9317462/
https://www.ncbi.nlm.nih.gov/pubmed/35887693
http://dx.doi.org/10.3390/jcm11143930
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author Ramos de Miguel, Ángel
Riol Sancho, Diego
Falcón-González, Juan Carlos
Pavone, Joana
Rodríguez Herrera, Leandro
Borkoski Barreiro, Silvia
Falcón Benitez, Nadia
Ramos Macias, Ángel
author_facet Ramos de Miguel, Ángel
Riol Sancho, Diego
Falcón-González, Juan Carlos
Pavone, Joana
Rodríguez Herrera, Leandro
Borkoski Barreiro, Silvia
Falcón Benitez, Nadia
Ramos Macias, Ángel
author_sort Ramos de Miguel, Ángel
collection PubMed
description New cochlear implant (CI) electrode arrays provide softer insertion dynamics; however, due to their high flexibility, the possibilities of fold-overs or intraoperative displacements must be taken into account. The position of each individual electrode can only be determined by using high-resolution computed tomography or cone-beam CT. The trans-impedance matrix test (TIM) is an electrophysiological method based on electric field imaging that can provide images of electrode position and electrode folding. Objective: In this experimental research, we evaluated the result of TIM as a method of monitoring cochlear insertion for a precurved slim modiolar electrode array in fresh human temporal bones by analyzing the transimpedance matrix patterns and their correlation with electrode position using high-resolution computed tomography. Material and Methods: Sixteen slim modiolar electrode arrays were inserted into eight fresh Human Temporal Bones. Eight electrodes were inserted according to the correct methodology of insertion, and eight were intentionally folded over. After all insertions, a trans-impedance matrix analysis and a Cone Beam CT (CBCT) were performed in each temporal bone. Results: If we correlated the TIM patterns with the radiological electrode position, we observed that better electrode intracochlear positions indicated more “homogeneous” TIM patterns (intracochlear voltage dropped monotonically as the distance between stimulation and recording contact increased, both toward the apex and toward the base). A correlation where fold-over was detected in the TIM results was found in all eight temporal bone radiological findings. Conclusions: Trans-Impedance Matrix patterns were correlated with the radiological CI electrode position. When a tip fold-over appeared, a matrix with a secondary ridge in addition to the primary ridge was observed in all cases. TIM can be an effective method in the control of electrode positioning.
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spelling pubmed-93174622022-07-27 Assessing the Placement of the Cochlear Slim Perimodiolar Electrode Array by Trans Impedance Matrix Analysis: A Temporal Bone Study Ramos de Miguel, Ángel Riol Sancho, Diego Falcón-González, Juan Carlos Pavone, Joana Rodríguez Herrera, Leandro Borkoski Barreiro, Silvia Falcón Benitez, Nadia Ramos Macias, Ángel J Clin Med Article New cochlear implant (CI) electrode arrays provide softer insertion dynamics; however, due to their high flexibility, the possibilities of fold-overs or intraoperative displacements must be taken into account. The position of each individual electrode can only be determined by using high-resolution computed tomography or cone-beam CT. The trans-impedance matrix test (TIM) is an electrophysiological method based on electric field imaging that can provide images of electrode position and electrode folding. Objective: In this experimental research, we evaluated the result of TIM as a method of monitoring cochlear insertion for a precurved slim modiolar electrode array in fresh human temporal bones by analyzing the transimpedance matrix patterns and their correlation with electrode position using high-resolution computed tomography. Material and Methods: Sixteen slim modiolar electrode arrays were inserted into eight fresh Human Temporal Bones. Eight electrodes were inserted according to the correct methodology of insertion, and eight were intentionally folded over. After all insertions, a trans-impedance matrix analysis and a Cone Beam CT (CBCT) were performed in each temporal bone. Results: If we correlated the TIM patterns with the radiological electrode position, we observed that better electrode intracochlear positions indicated more “homogeneous” TIM patterns (intracochlear voltage dropped monotonically as the distance between stimulation and recording contact increased, both toward the apex and toward the base). A correlation where fold-over was detected in the TIM results was found in all eight temporal bone radiological findings. Conclusions: Trans-Impedance Matrix patterns were correlated with the radiological CI electrode position. When a tip fold-over appeared, a matrix with a secondary ridge in addition to the primary ridge was observed in all cases. TIM can be an effective method in the control of electrode positioning. MDPI 2022-07-06 /pmc/articles/PMC9317462/ /pubmed/35887693 http://dx.doi.org/10.3390/jcm11143930 Text en © 2022 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Ramos de Miguel, Ángel
Riol Sancho, Diego
Falcón-González, Juan Carlos
Pavone, Joana
Rodríguez Herrera, Leandro
Borkoski Barreiro, Silvia
Falcón Benitez, Nadia
Ramos Macias, Ángel
Assessing the Placement of the Cochlear Slim Perimodiolar Electrode Array by Trans Impedance Matrix Analysis: A Temporal Bone Study
title Assessing the Placement of the Cochlear Slim Perimodiolar Electrode Array by Trans Impedance Matrix Analysis: A Temporal Bone Study
title_full Assessing the Placement of the Cochlear Slim Perimodiolar Electrode Array by Trans Impedance Matrix Analysis: A Temporal Bone Study
title_fullStr Assessing the Placement of the Cochlear Slim Perimodiolar Electrode Array by Trans Impedance Matrix Analysis: A Temporal Bone Study
title_full_unstemmed Assessing the Placement of the Cochlear Slim Perimodiolar Electrode Array by Trans Impedance Matrix Analysis: A Temporal Bone Study
title_short Assessing the Placement of the Cochlear Slim Perimodiolar Electrode Array by Trans Impedance Matrix Analysis: A Temporal Bone Study
title_sort assessing the placement of the cochlear slim perimodiolar electrode array by trans impedance matrix analysis: a temporal bone study
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9317462/
https://www.ncbi.nlm.nih.gov/pubmed/35887693
http://dx.doi.org/10.3390/jcm11143930
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