Preoperative electrophysiological analysis predicts preservation of hearing and facial nerve function following vestibular schwannoma surgery with continuous intraoperative neural monitoring

: clinical outcomes of twenty‐two cases

Makoto Hosoya, Naoki Oishi, Takanori Nishiyama, Masaru Noguchi, Kento Kasuya, Noriomi Suzuki, Hidemi Miyazaki, Kaoru Ogawa




Preoperative electrophysiological analysis predicts preservation of hearing and facial nerve function following vestibular schwannoma surgery with reinforced continuous intraoperative monitoring.

Setting the lower limit of the monitoring target amplitude in accordance with preoperative ENoG was associated with the preservation of facial nerve function.

Patients showing shorter auditory brain stem response wave V latency during preoperative analysis were good candidates for the present hearing preservation surgery by retrolabyrinthine approach.

Patients showing a higher otoacoustic emission response during preoperative analysis were good candidates for the present hearing preservation surgery by retrolabyrinthine approach.

Patients with more intact acoustic neurons or hair cells are the best candidates for the proposed hearing preservation surgery approach and the surgeon should consider operating at an early stage before the ABR and OAE responses become disturbed.