Intraoperative cochlear nerve mapping with the mobile cochlear nerve compound action potential tracer in vestibular schwannoma surgery

• DOI: 10.3171/2017.12.jns171545
• Publication Date: 2018-05-18T14:00:17Z
• Authors: Nobuyuki Watanabe; Takuya Ishii; Kazuhiko Fujitsu; Shogo Kaku; Teruo Ichikawa; Kosuke Miyahara; Tomu Okada; Shin Tanino; Yasuhiro Uriu; Yuichi Murayama
• Keywords: Cochlear nerve; Translabyrinthine approach; Vestibular nerve

OBJECTIVE The authors describe the usefulness and limitations of cochlear nerve compound action potential (CNAP) mobile tracer (MCT) that they developed to aid in mapping during vestibular schwannoma surgery (VSS) for hearing preservation. METHODS This MCT device requires no more than 2 seconds stable placement on obtain CNAP thus is able trace instantaneously. Simultaneous bipolar monopolar recording possible. present outcomes 18 consecutive patients who underwent preoperative useful (defined as class I or II Gardner-Robertson classification system) hearing-preservation VSS with use MCT. Mapping was considered successful when it possible detect nerve. RESULTS 13 (72.2%), preserved 11 (61.1%). Among 8 large tumors (Koos grade 3 4), rate 62.5% (5 patients). preservation 50% (4 CONCLUSIONS In addition microsurgical presumption arrangement each nerve, frequent probing around an unidentified comparison waveform are advisable both sensitive location-specific proved be may consequently helpful discuss some problems this device.