半面痉挛是因面神经颅内段异常兴奋导致的面部神经疾患,异常冲动传至一侧面神经支配的肌肉,引起对侧同步收缩。面肌痉挛患者的面部肌肉功能通常减弱,肌电图分析表明,患侧面肌有去神经支配现象。肉毒杆菌毒素A(Botulinum A Toxin)近来被用于治疗半面痉挛取得良好效果,它可缓解半面痉挛患者的不随 Hemifacial spasm is a facial nerve disorder caused by abnormal excitability of intracranial facial nerve. The abnormal impulse spreads to the muscle of a facial nerve and causes contralateral contraction synchronously. Facial muscle function in patients with hemifacial spasm is usually weakened, EMG analysis shows that the affected side of facial muscle denervation phenomenon. Botulinum A Toxin has recently been used for the treatment of hemifacial spasm with good results, it can relieve hemifacial spasm in patients with