肉毒毒素治疗偏侧面肌痉挛伴耳部症状的临床和电生理研究

目的 探讨偏侧面肌痉挛(HFS)伴耳部症状患者耳后肌受累以及A型肉毒毒素耳后肌注射的作用.方法 2009年7月至2010年1月就诊我科临床诊断为特发性HFS,同时伴有耳鸣或杂音、耳中"滴答声"或弹响、耳部不适等耳部症状的63例患者,其中33例于额肌、眼轮匝肌、颧肌及颊肌等常规位点注射(常规组),30例除常规位点外另予以耳后肌注射(耳后组).注射前后记录口轮匝肌和耳后肌的异常肌反应(AMR)、测量峰-峰波幅值；注射后至少4周,平均(29.5±2.5)d时随访.结果 (1)注射后两组患者均有耳部症状缓解,耳后组76.7％(23/30)]的缓解率比常规组45.5％(15/33)]更高(x2=6.40,P=0.011).(2)注射后痉挛侧AMR波幅均显著降低.注射前后常规组口轮匝肌波幅(μV)分别为304.0±30.3、129.3±9.6(t=5.820,P=0.000),耳后肌波幅(μV)分别为298.0±33.3、184.7±20.2(t=2.818,P=0.014)；注射前后耳后组口轮匝肌波幅(μV)分别为405.3±66.7、116.0±10.0(t=4.214,P=0.001),耳后肌波幅(μV)分别为390.0±53.6、72.0±9.7(t=6.011,P=0.000).(3)在耳后组,注射后耳后肌AMR波幅降低比常规组更明显(t=4.237,P=0.001).结论 在HFS伴耳部症状患者中电生理检测有助于指导治疗；除常规位点外,耳后肌注射可更好地改善患者的耳部症状.

Clinical and electrophysiological studies of botulinmn toxin type A for hemifacial spasm complicated with auricular symptoms

Objective To investigate the involvement of posterior auricular muscle (PAM) and the effect of botulinum toxin type A (BTX-A) injection into PAM in patients with hemifacial spasm (HFS)complicated by auricular symptoms.Methods Sixty-three consecutive HFS patients with auricular symptoms such as tinnitus or murmur,"ticking" or a "clicking" sound and discomfort on the same side,referred to our department between July,2009 and January,2010,were enrolled,and the diagnosis of idiopathic HFS was clinically made.The patients were largely randomized into two groups according to the order of referral.One was regular group including 33 cases whose injection sites were routinely at the frontal,orbicularis oculi,zygomaticus and buccinator muscles while another was PAM group including 30 cases,in which 4 units of BTX-A was additionally injected to the PAM.Before and after injection,the test of blink reflex was performed and lateral spread of blink reflex to orbicularis oris(OO)and PAM,I.e.Abnormal muscle response(AMR),were recorded,and the peak-peak amplitude of AMR was measured.The patients were followed up clinically and electrophysiologically at least 4 weeks((29.5±2.5)days) later.Results(1)The patients reported that their auricular symptoms subsided after injection in both groups.The remission rate was 45.5%(15/33)in the regular group and 76.7%(23/30)in the PAM group,respectively,with a higher rate in the PAM group(x2=6.40,P=0.011).(2)In both groups the AMR amplitude decreased significantly after injection.In the regular group,the OO amplitudes (μV) before and after injection were 304.0±30.3 and 129.3±9.6(t =5.820,P =0.000),and PAM amplitudes,298.0±33.3 and 184.7±20.2(t=2.818,P=0.014),respectively.In the PAM group,OO amplitudes were 405.3±66.7 and 116.0±10.0(t=4.214,P=0.001),PAM amplitudes,390.0±53.6 and 72.0±9.7(t=6.011,P=0.000),respectively.(3)The decrease of PAM amplitudes in the PAM group was more significant compared with those in the regular group (t=4.237,P=0.001).Conclusions In HFS patients with auricular symptoms,the electrophysiological studies are helpful for the guidance of treatment;and the auricular symptoms could be better improved after BTX-A injection into PAM in addition to those regular injection sites.