Abstract:
BACKGROUND:Several studies have investigated the relation between intraoperative abnormal muscle response (AMR) findings and postoperative results in patients undergoing microvascular decompression (MVD) for hemifacial spasm (HFS). However, there is some debate over the reliability of AMR as an indicator of postoperative outcome. We investigated whether AMR findings obtained during MVD reflect postoperative outcome in patients with HFS. METHOD:Subjects were 60 HFS patients who underwent AMR monitoring during MVD. AMR recordings were obtained from the mentalis muscle by electrical stimulation of the temporal branch of the facial nerve and from the orbicularis oculi muscles by stimulation of the marginal mandibular branch. Surgical outcome was compared with AMR findings at the completion of MVD. Mean follow-up was 61 months. FINDINGS:HFS resolved completely in 50 patients in whom AMR disappeared intraoperatively and in 5 patients in whom the AMR amplitude was decreased at the end of MVD. Four patients showed HFS at the final follow-up examination despite cessation or decrease of AMR during surgery. In 1 patient, preoperative AMR waveforms persisted throughout MVD, but the postoperative outcome was excellent. CONCLUSIONS:Our findings suggest that intraoperative cessation or decreased amplitude of AMR at the end of surgery indicates a high likelihood of postoperative relief of HFS. We believe that intraoperative AMR monitoring is useful in MVD surgery for HFS.
journal_name
Acta Neurochir (Wien)journal_title
Acta neurochirurgicaauthors
Yamashita S,Kawaguchi T,Fukuda M,Watanabe M,Tanaka R,Kameyama Sdoi
10.1007/s00701-005-0571-xsubject
Has Abstractpub_date
2005-09-01 00:00:00pages
933-7; discussion 937-8issue
9eissn
0001-6268issn
0942-0940journal_volume
147pub_type
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