本研究的目的首先是明确在非选择性急性缺血性卒中人群中 ,脑微栓子的发生率、频率及其临床意义。其次是研究这些因素是否有助于改进缺血性卒中亚型的分类。方法　作者通过ＴＣＤ连续观察 12 0例颈内动脉系统缺血患者缺血半球的大脑中动脉 ,每次观察时间持续 45分钟 ,第 1次Ｔ The purpose of this study is first to identify the incidence, frequency and clinical significance of cerebral microemboli in nonselective acute ischemic stroke population. Second is to study whether these factors contribute to the improvement of the classification of ischemic stroke subtypes. Methods The authors consecutively observed 120 middle cerebral arteries in the ischemic hemisphere of 140 patients with internal carotid artery ischemia via TCD. Each observation lasted 45 minutes. The first T