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Prognostic significance of preoperative electrophysiologic investigation for facial nerve outcome in acoustic neuroma surgery
Author(s) -
Wedekind Christoph,
Vahl Joachim,
Ernestus RalfIngo,
Klug Norfrid
Publication year - 2000
Publication title -
muscle and nerve
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.025
H-Index - 145
eISSN - 1097-4598
pISSN - 0148-639X
DOI - 10.1002/1097-4598(200012)23:12<1868::aid-mus11>3.0.co;2-h
Subject(s) - facial nerve , medicine , transcranial magnetic stimulation , acoustic neuroma , neuroma , latency (audio) , cranial nerve disease , stimulation , electromyography , surgery , anatomy , anesthesia , optic nerve , physical medicine and rehabilitation , electrical engineering , engineering
The prognostic significance of transcranial magnetic stimulation and nasal muscle F‐wave recording to predict postoperative facial nerve function was assessed in 24 patients with unilateral acoustic neuromas (mean diameter, 31 mm) and clinically intact facial nerve function. Latency of F waves and response to cortical magnetic stimulation, as well as F ratios, central motor conduction time, and the ratio of response latency to cortical and cisternal magnetic stimulation were significantly increased. Outcome analysis revealed no significant correlation between preoperative electrophysiologic changes and postoperative facial nerve function. However, a significant correlation with tumor diameter was detected. Thus, acoustic neuroma size seems to be the best predictor of facial nerve function after surgery. © 2000 John Wiley & Sons, Inc. Muscle Nerve 23: 1868–1871, 2000