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Comparison between intraoperative observations and electromyographic monitoring data for facial nerve outcome after vestibular schwannoma surgery
- Source :
- Acta Oto-Laryngologica. 125:1069-1074
- Publication Year :
- 2005
- Publisher :
- Informa UK Limited, 2005.
-
Abstract
- A four-channel device may enhance the sensitivity of electromyography (EMG). Determination of stimulation thresholds (STs) below 0.05 mA improves facial prognostic information after vestibular schwannoma (VS) surgery. To compare intraoperative observations with electromyographic data for predicting the immediate facial function outcome after VS surgery.A total of 111 VS patients operated on and intraoperatively monitored using four-channel facial EMG between October 2002 and September 2003 were included in this multicentre, prospective study. Mascular activity detection was performed in the frontal, orbicularis oculi, orbicularis oris and platysma muscles. Intraoperative observations were made concerning adhesion and nerve stretch, and facial function was graded (House-Brackmann classification) at postoperative Days 1 and 8.Facial function at postoperative Days 1 and 8 was related to the intraoperative nerve STs at the brainstem and in the adhesion zone (range 0.01-3 mA for a response100 microV). At postoperative Day 8, good facial function (Grades 1 or 2) was observed in 93% of cases for STs in the adhesion zone of 0.01-0.04 mA, 85% for STs of 0.05-0.3 mA and 79% for STs0.3 mA. These STs were related to the degree of tumor adhesion and not to the nerve stretch. The maximal EMG response was detected in the frontal or platysma muscles in 26% of cases, and in the orbicularis oris and orbicularis oculi muscles in 74%.
- Subjects :
- Adult
Male
medicine.medical_specialty
Adolescent
Acoustic neuroma
Tissue Adhesions
Electromyography
Schwannoma
Predictive Value of Tests
Monitoring, Intraoperative
medicine
Humans
Prospective Studies
Prospective cohort study
Aged
Aged, 80 and over
Vestibular system
medicine.diagnostic_test
business.industry
Neuroma, Acoustic
General Medicine
Middle Aged
Vestibular nerve
medicine.disease
Facial nerve
Electric Stimulation
Surgery
Facial Nerve
Treatment Outcome
Otorhinolaryngology
Anesthesia
Female
business
Facial electromyography
Follow-Up Studies
Subjects
Details
- ISSN :
- 16512251 and 00016489
- Volume :
- 125
- Database :
- OpenAIRE
- Journal :
- Acta Oto-Laryngologica
- Accession number :
- edsair.doi.dedup.....651b33d5bf6d0689f9cd63471c31a4ab