{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,24]],"date-time":"2026-09-24T11:59:34Z","timestamp":1790251174701,"version":"4.1.0"},"reference-count":20,"publisher":"Wiley","issue":"4","license":[{"start":{"date-parts":[[2025,7,16]],"date-time":"2025-07-16T00:00:00Z","timestamp":1752624000000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by-nc\/4.0\/"}],"content-domain":{"domain":["aao-hnsfjournals.onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Otolaryngol.--head neck surg."],"published-print":{"date-parts":[[2025,10]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:sec><jats:title>Objective<\/jats:title><jats:p>The aim of the present study is to identify electrophysiological parameters in facial nerve monitoring that provide the best predictive values in vestibular schwannoma surgery.<\/jats:p><\/jats:sec><jats:sec><jats:title>Study Design<\/jats:title><jats:p>Retrospective study.<\/jats:p><\/jats:sec><jats:sec><jats:title>Setting<\/jats:title><jats:p>Tertiary care hospital.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>In total, 76 patients undergoing translabyrinthine vestibular schwannoma resection were included. Facial nerve monitoring was conducted with free\u2010running electromyography and direct electrical stimulation. Direct electrical stimulation protocol was predicated on a constant\u2010current delivery at the root exit zone before and after tumor excision; specifically, recordings were made with increasing current settings: 0.05, 0.1, and 0.3\u2009mA. The maximum amplitude measured from either of the two muscle groups was used for further correlations. Facial nerve function was graded according to the House\u2010Brackmann (HB) scale before and after tumor excision.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>Immediate postoperative facial nerve outcomes were HB I (21%), HB II (40%), HB III (18%), HB IV (9%), and HB V (12%).<\/jats:p><jats:p>Long\u2010term facial nerve outcomes were distributed as follows: 66% HB I, 21% HB II, 12% HB III, and 1% HB IV. Results show that patients with a higher amplitude\u2009\u2265\u20091024\u2009\u03bcV at orbicularis oris and\/or frontalis had a &gt;90% estimated probability of an HB I\u2010II score in the long term. In contrast, patients with a low amplitude of, for example, 128\u2009\u03bcV at orbicularis oris had an estimated 53% probability of an HB score of III or IV in the long term.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusion<\/jats:title><jats:p>Facial nerve monitoring is an indispensable objective measure during vestibular schwannoma surgery. Higher amplitudes lead to more favorable results for patients. Amplitudes 500 and 1000\u2009\u03bcV seem to be useful cutoff points to help guide patient expectations with respectively &gt;84% and &gt;90% estimated probability of an HB I\u2010II score in the long term.<\/jats:p><\/jats:sec><jats:sec><jats:title>Level of Evidence<\/jats:title><jats:p>3.<\/jats:p><\/jats:sec>","DOI":"10.1002\/ohn.1349","type":"journal-article","created":{"date-parts":[[2025,7,17]],"date-time":"2025-07-17T06:59:11Z","timestamp":1752735551000},"page":"961-966","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["Correlation of Facial Nerve Function and Electrical Stimulation During Vestibular Schwannoma Surgery"],"prefix":"10.1002","volume":"173","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-1295-1850","authenticated-orcid":false,"given":"Valerie","family":"Dahm","sequence":"first","affiliation":[{"name":"Department of Otolaryngology\u2013Head &amp; Neck Surgery, Sunnybrook Health Sciences Centre University of Toronto Toronto Canada"},{"name":"Department of Otolaryngology\u2013Head &amp; Neck Surgery Medical University of Vienna Vienna Austria"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6843-4249","authenticated-orcid":false,"given":"Justin T.","family":"Lui","sequence":"additional","affiliation":[{"name":"Department of Otolaryngology\u2013Head &amp; Neck Surgery, Sunnybrook Health Sciences Centre University of Toronto Toronto Canada"},{"name":"Section of Otolaryngology\u2013Head &amp; Neck Surgery, Department of Surgery, Cumming School of Medicine University of Calgary Calgary Canada"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6187-0195","authenticated-orcid":false,"given":"Jennifer L.","family":"Spiegel","sequence":"additional","affiliation":[{"name":"Department of Otolaryngology\u2013Head &amp; Neck Surgery, Sunnybrook Health Sciences Centre University of Toronto Toronto Canada"},{"name":"Department of Otorhinolaryngology, University Hospital Ludwig Maximilian University Munich Munich Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8025-4195","authenticated-orcid":false,"given":"Carolyn","family":"Lai","sequence":"additional","affiliation":[{"name":"Department of Neurosurgery, Sunnybrook Health Sciences Centre University of Toronto Toronto Canada"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3526-1345","authenticated-orcid":false,"given":"Justine","family":"Philteos","sequence":"additional","affiliation":[{"name":"Department of Otolaryngology\u2013Head &amp; 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