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目的 研究大脑中动脉（ＭＣＡ）狭窄患者采用ＴＣＤ检测微栓子（ＭＥＳ）的诊断价值。方法 对２１ 例年龄在３５～５７ 岁的单侧ＭＣＡ 狭窄患者，经ＣＴ／ＭＲＩ证实为脑梗死。均进行３０ 分钟的双焦距ＴＣＤ监测。结果 ４例（１９．０％ ）检测到ＭＥＳ。其中３ 例在狭窄远端检测到，１ 例近、远端均检测到。均为大面积脑梗死（４／１３，３０．８％ ），而腔隙性梗死未发现ＭＥＳ。结论 双焦距ＴＣＤ检测ＭＥＳ对于确定栓子来源有重要价值，同时说明ＭＥＳ与大面积梗死有关。
Objective To investigate the diagnostic value of TCD for the detection of microemboli (MES) in patients with stenosis of middle cerebral artery (MCA). Methods Twenty-one patients with unilateral MCA stenosis between the ages of 35 and 57 years old were confirmed as cerebral infarction by CT / MRI. A 30-minute dual focal length TCD monitor was performed. Results MES was detected in 4 cases (19.0%). Three of them were detected in the distal part of the stenosis and one in the proximal and distal part of the stenosis. All of them were large-area cerebral infarction (4/13, 30.8%), while no lacunar infarction found MES. Conclusions Dual-focal length TCD detection of MES is of great value in determining the origin of emboli. It also shows that MES is associated with large infarcts.