Otology/Neurotology

Introduction: We assess early hearing preservation (HP) outcomes of patients implanted with the new Slim 20 lateral wall array (CI624);compare HP and without real-time electrocochleography (RT-ECochG);and explain role RT-ECochG feedback to improve HP. believe this abstract is suitable for a late-breaking as we are first report electrode (CI624). Since CI624's release in May 2020, it becoming increasingly popular among centers potential array. To our knowledge, there have not been any discussions at major conferences or published studies reviewing experiences CI624. Based on experience 29 implantations using electrode, found poor 1 month postoperatively only 16 recipients. As result, began monitoring cochlear health during insertion (ie, [ECochG]) potentially By ECochG (RT-ECochG) particularly focusing minimizing trauma end insertion, achieved superior rates (8/9 patients, 88.9%). Our preliminary data suggest that full CI624 results unpredictable relatively outcomes. suspect related being longer than previous hybrid arrays resulting apical-most hair cells neural elements insertion. Thus, may be required predictable result COVID-19 pandemic, were unable achieve sufficient submission an January 2021. However, now performed 9 implants past 6 months candidates. has resulted critical finding influence how implant used Methods: A longitudinal study was designed postlinguistically deafened adults undergoing implantation from 2020 Pure-tone audiometry preoperatively obtained. defined low-frequency pure-tone average (LFPTA;125, 250, 500 Hz) 5 μV response drop, adjustments withdrawal ∼1 mm, 5° anti-modiolar rotation) made facilitate recovery. Results: total 38 performed. There no scalar translocation postoperative CT scans mean apical angle 338.1° ± 86.4°. Full most cases;however, partial if dropped final 3 electrodes (n = 4). Of where used, (55.2%) had preoperative LFPTA 42.4 16.4 dB threshold shift 83.9 27.8 dB. Among 8 (88.9%) 46.5 16.0 62.6 19.0 Difference between significant (P .002, Mann-Whitney U test). Conclusion: RT-ECochG-guided consistent following implantation. This allow surgeon decide depth effort preserve hearing. Further investigation needed evaluate whether long-term can maintained