短暂性脑缺血发作（简称对A）是指某一区域脑组织因血液供血不足导致其功能发生短暂的障碍，大多数持续数分钟至数小时，可反复发作，目前临床上对对出发作时脑血管的表现缺乏安全有效的检测方法，自从经颇多普勒（简称TCD）的出现，可以反复元创性检测flA发作的脑血管发生的变 Transient ischemic attack (referred to as A) refers to a region of brain tissue due to insufficient blood supply leading to short-term dysfunction of its function, most of the sustained minutes to hours, can be recurrent, the current clinic on the departure When the performance of cerebrovascular lack of safe and effective detection methods, since the occurrence of quite a lot of Doppler (TCD), repeated seminal flt onset of cerebrovascular changes can be detected