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Efficacy of a Quantitative Intra-Operative Facial Nerve Continuous Monitoring System for Functional Preservation
Makoto Hosoya1, Marie N Shimanuki1, Masafumi Ueno1
1Department of Otolaryngology-Head and Neck Surgery Keio University School of Medicine Tokyo Japan.
Objective:
Preservation of the facial nerve is critical in surgery for facial nerve schwannoma. Intra-operative monitoring systems typically assess facial nerve function by delivering intermittent electrical stimulation through electrodes; however, this approach cannot effectively achieve continuous stimulation and quantitative assessment. This study aimed to assess the efficacy of a quantitative intra-operative facial nerve continuous monitoring system for preserving post-operative facial nerve function.
Methods:
Ten patients who underwent continuous nerve monitoring using this system during surgery for facial nerve schwannoma were included. Clinical data, electrode placement sites, and pre- and postoperative facial nerve function assessed using the House-Brackmann grading system were retrospectively analyzed. In patients with conductive hearing loss, postoperative hearing outcomes were also analyzed.
Results:
Facial nerve function was preserved in all patients, except for one patient who experienced transient postoperative functional deterioration. In several cases, conductive hearing loss improved following schwannoma resection.
Conclusion:
Continuous and quantitative monitoring of facial nerve function is a reliable intraoperative evaluation that may help prevent unexpected facial nerve injury. This system represents a valuable tool for application in facial nerve schwannoma surgeries.
Level Of Evidence:
Level 4.
