大脑中动脉(MCA)狭窄是一种少见的闭塞性疾病,约占年发病率的7％～8％。MCA狭窄常与心脏病或同侧颈动脉疾病并发,因而给检测栓子的来源造成困难。本研究旨在估计MCA患者微栓子信号(MES)的出现情况及双通道探头TCD检测MCA狭窄的潜力和局限性。 方法 选择连续住院的14例患者,平均年龄为64±14岁。其中MCA中度狭窄(管径减小50％～69％) Middle cerebral artery (MCA) stenosis is a rare occlusive disease, accounting for about 7% to 8% of annual morbidity. MCA stenosis often associated with heart disease or ipsilateral carotid artery disease, thus giving rise to the difficulty of detecting the source of emboli. This study was designed to assess the presence of microemboli signal (MES) in patients with MCA and the potential and limitations of dual channel TCD in detecting MCA stenosis. Methods A total of 14 consecutive hospitalized patients were selected, with an average age of 64 ± 14 years. MCA moderate stenosis (diameter reduced by 50% to 69%)