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Updated: Mar 6, 2026
Microvascular Decompression: Salient Surgical Principles and Technical Nuances
Published on: July 5, 2011
Electromyographically Guided Nerve Combing Makes Microvascular Decompression More Successful in Hemifacial Spasm with
Xin Zhang1, Hua Zhao1, Jin Zhu1
1Department of Neurosurgery, Xinhua Hospital, Shanghai Jiaotong University School of Medicine, Shanghai, China; Center for diagnosis and treatment of cranial nerve diseases, Shanghai Jiao Tong University, Shanghai, China.
Electromyography (EMG)-guided nerve combing after microvascular decompression (MVD) for hemifacial spasm significantly improves surgical success rates in cases with persistent abnormal muscle response (AMR). While short-term facial palsy increased, long-term rates were comparable to simple MVD.
Area of Science:
- Neurosurgery
- Neurology
- Surgical Techniques
Background:
- Microvascular decompression (MVD) is a standard treatment for hemifacial spasm.
- Persistent abnormal muscle response (AMR) after MVD is common.
- Electromyography (EMG)-guided nerve combing is a potential treatment for persistent AMR.
Purpose of the Study:
- To compare the effectiveness of EMG-guided nerve combing with simple MVD for persistent AMR after MVD in hemifacial spasm.
- To evaluate surgical success rates and postoperative facial palsy incidence.
Main Methods:
- Retrospective study of 127 hemifacial spasm cases with persistent AMR post-MVD (Jan 2011-June 2015).
- 72 patients underwent EMG-guided nerve combing; 55 underwent simple MVD.
- Success rates and facial palsy incidence were compared between groups.
Main Results:
- MVD with nerve combing showed significantly higher success rates at all measured time points (1 day to 1 year) compared to simple MVD (P < 0.05).
- Short-term (up to 1 week) facial palsy incidence was significantly higher in the nerve combing group (P < 0.05).
- Long-term facial palsy incidence (1 month to 1 year) was not significantly different between the groups.
Conclusions:
- EMG-guided nerve combing significantly enhances surgical success for hemifacial spasm with persistent AMR after MVD.
- The technique increases short-term postoperative facial palsy but shows no significant long-term difference compared to simple MVD.
