Philipp Mittmann1, Ingo Todt2, Arneborg Ernst2, Grit Rademacher3, Sven Mutze3, Sophia Göricke4, Marc Schlamann5, Stephan Lang6, Diana Arweiler-Harbeck6, Florian Christov6. 1. Department of Otolaryngology, ukb Berlin, Germany philipp.mittmann@googlemail.com. 2. Department of Otolaryngology, ukb Berlin, Germany. 3. Radiology at ukb Berlin, Germany. 4. Department of Neuroradiology and Radiology, University Hospital of Essen, University Duisburg-Essen, Essen, Nordrhein-Westfalen, Germany. 5. Department of Neuroradiology and Radiology, University Hospital Giessen and Marburg GmbH, Germany. 6. Department of Otolaryngology, Head and Neck Surgery, University Hospital of Essen, University Duisburg-Essen, Germany.
Abstract
OBJECTIVES: An intraoperative neural response telemetry-ratio (NRT-ratio) was established, which can provide information about the intraoperative intracochlear electrode array position for perimodiolar electrodes. METHODS: In a retrospective controlled study in 2 tertiary referral centers, the electrophysiological data sets of 50 patients with measured intraoperative auto-NRTs and postoperative radiological examinations were evaluated. All patients were implanted with Nucleus slim straight electrodes. The NRT-ratio was calculated by dividing the average auto-NRT data from electrodes 16 to 18 with the average from electrodes 5 to 7. Using a flat panel tomography system or a computed tomography, the position of the electrode array was certified radiological. RESULTS: Radiologically, 2 out of 50 patients were identified with an electrode translocated from the scala tympani into the scala vestibuli. The radiologically estimated electrodes indicating a scalar change showed a regular NRT-ratio but nonspecific NRT-level changes at the localization of translocation.
OBJECTIVES: An intraoperative neural response telemetry-ratio (NRT-ratio) was established, which can provide information about the intraoperative intracochlear electrode array position for perimodiolar electrodes. METHODS: In a retrospective controlled study in 2 tertiary referral centers, the electrophysiological data sets of 50 patients with measured intraoperative auto-NRTs and postoperative radiological examinations were evaluated. All patients were implanted with Nucleus slim straight electrodes. The NRT-ratio was calculated by dividing the average auto-NRT data from electrodes 16 to 18 with the average from electrodes 5 to 7. Using a flat panel tomography system or a computed tomography, the position of the electrode array was certified radiological. RESULTS: Radiologically, 2 out of 50 patients were identified with an electrode translocated from the scala tympani into the scala vestibuli. The radiologically estimated electrodes indicating a scalar change showed a regular NRT-ratio but nonspecific NRT-level changes at the localization of translocation.
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