16例半侧咀嚼肌痉挛肌电图类型分析

An analysis of electromyographic types of 16 cases with hemimasticatory spasm

目的对半侧咀嚼肌痉挛(HMS)患者的不同肌电图表现进行分型。方法对16例半侧咀嚼肌痉挛的患者进行双侧咬肌、颞肌前束表面电极肌电图检查,并对其不同肌电图表现进行分析。结果16例患者中,14例为牙齿接触状态时出现痉挛,发作时其运动单位电位呈持续型发放8例(57.2%),节律型3例(21.4%),不规则型3例(21.4%)。而下颌休息位时出现痉挛为2例。结论HMS患者肌痉挛可呈不同形式运动单位电位发放且以持续型为主,多在牙齿接触状态时出现。

Objective： To investigate varied electromyographic types in the patients with hemimasticatory spasm （HMS）. Methods：Surface electromyography was recorded to study electromyographic features of 16 cases with HMS. Results：Spasm was found in mandibular rest position in 2 cases and in tooth contact position in 14 cases. During the involuntary spasm of the 14 cases, motor unit potential could be classified into three types ： continuous （ 8 cases ） , rhythmic （ 3 cases） and irregular （ 3 cases ）. Conclusion： The electromyographic feature of hemimasticatory spasm is characterized by continuous motor unit potential discharge. The spasm is mostly triggered by tooth contact.