Discovery of a new waveform for intraoperative monitoring of hemifacial spasms

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• 作者：Xuesheng Zheng (1)
  Wenyao Hong (1)
  Yinda Tang (1)
  Tingting Ying (1)
  Zhenghai Wu (1)
  Ming Shang (1)
  Baohui Feng (1)
  Wenchuan Zhang (2)
  Xuming Hua (2)
  Jun Zhong (1) (2)
  Shiting Li (1) (2)
  
• 关键词：Hemifacial spasm ; Facial nerve ; Offending artery ; Waveform
• 刊名：Acta Neurochirurgica
• 出版年：2012
• 出版时间：May 2012
• 年：2012
• 卷：154
• 期：5
• 页码：799-805
• 全文大小：459KB
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• 作者单位：Xuesheng Zheng (1)
  Wenyao Hong (1)
  Yinda Tang (1)
  Tingting Ying (1)
  Zhenghai Wu (1)
  Ming Shang (1)
  Baohui Feng (1)
  Wenchuan Zhang (2)
  Xuming Hua (2)
  Jun Zhong (1) (2)
  Shiting Li (1) (2)
  
  1. Department of Neurosurgery, XinHua Hospital, Affiliated to Shanghai JiaoTong University School of Medicine, 1665 Kongjiang Road, Yangpu District, Shanghai, 200092, China
  2. The Cranial Nerve Disease Center of Shanghai, 1665 Kongjiang Road, Yangpu District, Shanghai, 200092, China
  

文摘

Background Surgeons often rely on intraoperative electrophysiological monitoring to determine whether decompression is sufficient during microvascular decompression surgery for hemifacial spasms. A new monitoring method is needed when an abnormal muscle response is occasionally not available or is unreliable. This study was an observational clinical trial exploring a new waveform recorded from the facial muscles while the offending artery wall was electrically stimulated. Methods Thirty-two patients with typical hemifacial spasm and 12 with trigeminal neuralgia as a control were included. The facial muscle response was recorded during microvascular decompression surgery while the offending artery wall was stimulated (2?mA?×-.2?ms). The latency, amplitude, and effective refractory period were analyzed. Results A waveform was recorded from the facial muscles of patients with hemifacial spasm when the offending artery wall was stimulated and was named the “Z-L response.-The latency was 7.3?±-.8?ms, the amplitude was 0.08?±-.02?mV, and the effective refractory period was 3.5-?ms. The Z-L response disappeared immediately after microvascular decompression. No waveform was recorded from the facial muscles of patients with trigeminal neuralgia while the anterior inferior cerebellar artery, which adheres to the facial nerve, was stimulated (2?mA?×-.2?ms). Conclusion We found a new waveform for intraoperative monitoring of hemifacial spasm. The Z-L response was useful when the abnormal muscle response was absent before decompression or persisted after all vascular compressions were properly treated. Particularly, the Z-L response may help neurosurgeons determine the real culprit when multiple offending vessels exist.