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Related Experiment Video

Updated: Apr 26, 2026

Extraction of the EPP Component from the Surface EMG
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[Hemimasticatory muscle spasm: an electromyogram analysis].

Yu-wei Wang1, Xu-chen Ma, Zhen-kang Zhang

  • 1Department of Temporomandibular Joint Disorder and Orofacial Pain, Peking University School of Stomatology, Beijing 100081, China.

Zhonghua Kou Qiang Yi Xue Za Zhi = Zhonghua Kouqiang Yixue Zazhi = Chinese Journal of Stomatology
|April 6, 2004
PubMed
Summary
This summary is machine-generated.

Electromyogram (EMG) is crucial for diagnosing hemimasticatory spasm (HMS). EMG reveals abnormal trigeminal nerve activity, confirming involuntary muscle contractions characteristic of HMS.

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Area of Science:

  • Neurology
  • Neurophysiology

Context:

  • Hemimasticatory spasm (HMS) is a rare condition.
  • Accurate diagnosis of HMS is essential for effective management.

Purpose:

  • To evaluate the diagnostic utility of electromyogram (EMG) in patients presenting with hemimasticatory spasm (HMS).

Summary:

  • This study reports on four cases of HMS.
  • Needle and surface electrode EMG examinations were performed on all patients.
  • EMG findings included grouped potentials synchronous with spasm onset, indicating abnormal trigeminal nerve excitatory activity causing involuntary masticatory muscle movements.

Impact:

  • EMG provides objective evidence of abnormal neuromuscular activity in HMS.
  • This diagnostic tool aids in confirming the clinical diagnosis of hemimasticatory spasm.