{"id":"79a487af-b8d5-4da7-a075-be902536a133","slug":"monitoring-of-abnormal-muscle-response-and-facial-motor-evoked-potential-during-microvascular-decompression-for-hemifacial-spasm","title":"Monitoring of abnormal muscle response and facial motor evoked potential during microvascular decompression for hemifacial spasm","authors":["Masafumi Fukuda","Makoto Oishi","Tetsuro Takao","Tetsuya Hiraishi","Yosuke Sato","Yukihiko Fujii"],"abstract":"Background: To determine whether the monitoring of abnormal muscle response (AMR) and facial motor evoked potential (FMEP) during microvascular decompression (MVD) for hemifacial spasm (HFS) might be useful for predicting the postoperative clinical course and final outcomes. Methods: We analyzed 45 HFS patients who underwent both AMR and FMEP monitoring during MVD. Patients were divided into two groups on the basis of post-MVD disappearance (group AMR-A) or persistence (group AMR-B) of AMR. With regard to FMEPs, patients were classified into one of the two groups according to the ratio of the final to baseline FMEP amplitudes recorded for the orbicularis oculi muscle: one group with a ratio of <50% (group FMEP-A), and the other with a ratio of ≥50% (group FMEP-B). Results: Twenty-one of the 26 (81%) patients in group AMR-A were assigned to group FMEP-A, whereas 9 of the 17 (53%) patients in group AMR-B were assigned to FMEP-B (P P < 0.001). Conclusions: Intraoperative monitoring of both AMR and FMEP during MVD may be useful in predicting the postoperative outcomes in HFS patients. The AMR-related findings may help to predict whether HFS disappears immediately after surgery or some time later.","thumbnailUrl":"https://sni-digital-videos.s3.amazonaws.com/articles/79a487af-b8d5-4da7-a075-be902536a133/featured/hero-1782420927676.png","publishDate":"2012-10-13T00:00:00.000Z","doi":"10.4103/2152-7806.102328","categories":["Original Article"],"fullTextUrl":"http://sni.wpengine.com/wp-content/uploads/2015/05/3458/SNI-3-118.pdf"}