BACKGROUND: Despite routine use of intraoperative neuromonitoring in @entity5513 removal, its application in predicting long-term facial function is limited. METHODS: Prospective recording of @entity2103 and subsequent review of intraoperative neurophysiologic data. Stimulation of the facial nerve was performed proximal and distal to the @entity5 locus after @entity5 removal with measurement of amplitude and latency responses in the orbicularis oculi and oris muscles. Prospective review of current @entity2103 was performed using the House-Brackmann (HB) scoring system. Good facial function was determined as @entity23201 was considered poor facial function. Minimum follow-up time was 15 months, and averaged 40 months. RESULTS: Twenty-four grade IV @entity5513 (54 % larger than 4 cm) were completely removed from October 2008 to November 2013. Nine @entity1 (37.5 %) had @entity70004 (62.5 %) had HB III-VI. The poor prognosis group had a higher latency than the good prognosis group (p   =   0.045). Lower proximal amplitude was detected in the poor prognosis group (p   =   0.046). Lower proximal-to-distal amplitude ratio was also detected in the poor prognosis group (p   =   0.052). Amplitude ratio cut-offs of 0.44 and 0.25 were able to predict poor prognosis with sensitivity of 0.73 and 0.4 and specificity of 0.78 and 1, respectively (p   =   0.046). CONCLUSIONS: Lower proximal amplitude and proximal-distal amplitude ratio were previously reported as predictors of poor facial function in different sizes of @entity5513 . We observed that the same applies specifically for large-sized, completely removed, grade IV @entity5 . Additionally, we describe a difference in proximal latency time between the good and poor prognosis groups, which was not previously reported.

Predictive value of intraoperative neurophysiologic monitoring in assessing long-term facial function in grade IV XXXX removal.

@entity1 :: ('9606', 'Species') :: ['patients'] @entity5513 :: ('MESH:D009464', 'Disease') :: ['acoustic neuromas', 'acoustic neuroma', 'vestibular schwannomas'] @entity70004 :: ('2288;9308', 'Gene') :: ['HB I/II and 15'] @entity5 :: ('MESH:D009369', 'Disease') :: ['tumor', 'tumors'] @entity2103 :: ('MESH:D005155', 'Disease') :: ['facial nerve function'] @entity23201 :: ('2288', 'Gene') :: ['HB I/II and HB III-VI']
@entity5513 :: (MESH:D009464,Disease) :: ['vestibular schwannoma']
