Simultaneous Intra- and Extracochlear Electrocochleography During Electrode Insertion
| Autor: | Leanne Sijgers, Alexander M. Huber, Dorothe Veraguth, Flurin Pfiffner, Adrian Dalbert, Julian Grosse, Christof Röösli |
|---|---|
| Přispěvatelé: | University of Zurich |
| Rok vydání: | 2020 |
| Předmět: |
Materials science
medicine.medical_treatment 610 Medicine & health 10045 Clinic for Otorhinolaryngology 01 natural sciences Electrode insertion 03 medical and health sciences Speech and Hearing 0302 clinical medicine Cochlear implant 0103 physical sciences Electrode array medicine Humans 030223 otorhinolaryngology Cochlear implantation Electrodes 010301 acoustics Cochlea Round window Electrocochleography Cochlear Implantation Audiometry Evoked Response Cochlear Implants medicine.anatomical_structure Round Window Ear Otorhinolaryngology Electrode sense organs Biomedical engineering |
| Zdroj: | Ear & Hearing. 42:414-424 |
| ISSN: | 1538-4667 |
| Popis: | Objectives: (1) To correlate simultaneously recorded intra- and extracochlear electrocochleography (ECochG) signals during electrode insertion into the cochlea, (2) to track changes in the ECochG signal during insertion and removal of an electrode, and (3) to correlate the findings with the preoperative residual hearing. We hypothesized that intracochlear ECochG recordings show signal changes not reflected in simultaneous extracochlear ECochG recordings. Design: During cochlear implantation in human cochlear implant recipients, a short, slim, custom-made electrode was inserted and removed in a stepwise manner. At each step, ECochG recordings were simultaneously recorded by an extracochlear electrode near the round window and via the inserted electrode. The acoustic stimulus was a 500 Hz tone burst at 110 to 130 dB SPL. Results: The mean amplitude difference between intra- and extracochlear ongoing ECochG responses was 14 dB (range 9 to 24 dB; n = 10) at the beginning of insertion. Intracochlear ECochG responses were larger in all cases. Extracochlear ECochG responses remained stable while intracochlear recordings showed large variations regarding amplitude and phase during the electrode array insertion. Intracochlear signal changes during insertion were reversible with retraction of the electrode. There were only weak to moderate (rs = 0.006 to 0.4), nonsignificant correlations of residual preoperative hearing with maximum amplitudes and amplitude changes during electrode insertion and removal in intracochlear recordings. Conclusions: Signals in intracochlear ECochG recordings are reliably larger than ECochG signals recorded simultaneously from an extracochlear location. Intracochlear ECochG recordings show reversible amplitude and phase changes during insertion, not reflected in simultaneous extracochlear ECochG recordings. Such changes are most likely due to the movement of the recording electrode in relation to the signal generators. Residual high-frequency hearing is associated with larger ECochG signal amplitudes. Modeling of expected intracochlear ECochG changes during electrode insertions may allow detection of cochlear trauma in the future. |
| Databáze: | OpenAIRE |
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