Intraoperative transimpedance and spread of excitation profile correlations with a lateral-wall cochlear implant electrode array
| Autor: | Samuel Söderqvist, Antti A. Aarnisalo, Ville Sivonen, Timo P. Hirvonen, Satu Lamminmäki, Saku T. Sinkkonen |
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| Přispěvatelé: | Korva-, nenä- ja kurkkutautien klinikka, HUS Head and Neck Center |
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
0301 basic medicine
Transimpedance amplifier Adult Materials science Adolescent medicine.medical_treatment SPEECH-PERCEPTION SPATIAL SPREAD Cochlear nucleus IMPEDANCE NOISE 03 medical and health sciences Young Adult 0302 clinical medicine Cochlear implant otorhinolaryngologic diseases medicine Electrode array Humans Channel interaction 3125 Otorhinolaryngology ophthalmology Child MASKING Cochlear Nerve Intracochlear electrical field Aged Aged 80 and over Cochlear nerve Infant Transimpedance matrix Middle Aged Cochlear Implantation Sensory Systems Cochlea Electrodes Implanted Cochlear diameter RECIPIENTS 030104 developmental biology Cochlear Implants Spread of excitation Child Preschool Electrode TRIPOLAR STIMULI PATTERNS Lateral wall 030217 neurology & neurosurgery Excitation Biomedical engineering |
| Popis: | A limiting factor of cochlear implant technology is the spread of electrode-generated intracochlear electrical field (EF) leading to spread of neural excitation (SOE). In this study, we investigated the relation of the spread of the intracochlear EF, assessed via transimpedance matrix (TIM), and SOE. A total of 43 consecutive patients (ages 0.7-82 years; 31.0 +/- 25.7 years, mean +/- SD) implanted with a Cochlear Nucleus CI522 or CI622 cochlear implant with Slim Straight electrode array (altogether 51 ears) were included in the study. Cochlear nerve was visualized for all patients in preoperative imaging and there were no cochlear anomalies in the study sample. The stimulated electrodes were in the basal, middle, and apical parts of the electrode array (electrode numbers 6, 11, and 19, respectively). The stimulation level was 210 CL on average for the TIM measurement and always 230 CL for the SOE measurement. Approximately 90% of the individual TIM and SOE profiles correlated with each other ( p < .05; r = 0.61- 0.99). Also, the widths of the TIM and SOE peaks, computed at 50% of the maximum height, exhibited a weak correlation ( r = 0.39, p = .007). The 50% widths of TIM and SOE were the same only in the apical part of the electrode array; in the basal part SOE was wider than TIM, and in the middle part TIM was wider than SOE ( p < .01 and p = .048, respectively). Within each measurement, TIM 50% widths were different between all three parts of the electrode array, while for SOE, only the basal electrode differed from the middle electrode. Finally, the size of the cochlea and the 50% widths of TIM and SOE had the strongest correlation in the middle part of the electrode array ( r = -0.63, and -0.37, respectively). Our results suggest that there is a correlation between the spread of intracochlear EF and neural SOE at least in the apical part of the electrode array used in this study, and that larger cochleae are associated with more focused TIM and SOE. (c) 2021 Elsevier B.V. All rights reserved. |
| Databáze: | OpenAIRE |
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