BACKGROUND: Preservation of @entity2103 is one of the most important goals in @entity5513 surgery. We have been using intraoperative continuous monitoring of evoked facial nerve electromyograms (EMGs) since 1997 in @entity5513 surgery. We therefore investigated surgically treated @entity1 to clarify the usefulness of this monitoring, and to determine safety criteria for preserving @entity2103 . METHODS: This intraoperative continuous monitoring of evoked facial nerve EMG is a method for checking the EMG evoked by continuous direct electrical stimulation of the facial nerve during @entity5 excision. The greatest advantage of this method is the ability to identify changes in EMG in real time. We retrospectively investigated 216 @entity1 with surgically treated @entity5513 to identify correlations between parameters in this monitoring and postoperative @entity2103 immediately and 1  year after surgery. RESULTS: In these @entity1 , the functional preservation rate of the facial nerve (House and Brackmann grade 1 or 2 at 1  year after surgery) was 98.6% with a 98.2% mean @entity5 resection rate. Amplitude preservation ratio correlated significantly with @entity2103 both immediately and 1  year after surgery. To avoid severe @entity2103 , a warning criterion of amplitude preservation ratio >50% appears useful. CONCLUSIONS: Postoperative course of @entity2103 appears predictable using intraoperative continuous monitoring of evoked @entity2103 . This monitoring is useful to increase the @entity5 excision rate while avoiding severe postoperative @entity2103 in @entity5513 surgery.

Intraoperative continuous monitoring of evoked facial nerve electromyograms in XXXX surgery.

@entity1 :: ('9606', 'Species') :: ['patients'] @entity5513 :: ('MESH:D009464', 'Disease') :: ['acoustic neuroma'] @entity5 :: ('MESH:D009369', 'Disease') :: ['tumor'] @entity2103 :: ('MESH:D005155', 'Disease') :: ['facial nerve EMGs', 'facial nerve palsy', 'facial nerve function']
@entity5513 :: (MESH:D009464,Disease) :: ['acoustic neuroma']
