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短暂性脑缺血发作(TIAs)的发作期限过去在美国指定为24小时。最近研究认为大多数的TIAs 是短暂的,24%在5分钟内终止,39%在15分钟内终止,50%在30分钟内终止,60%在1小时内终止。若发作持续1～2小时以上则可能留下神经损害及CT显示梗塞现象。关于TIAs 自然史资料始于1973年,这些资料显示TIA 后中风的可能在第一年是8%,其后三年每年5%,再其后数年每年约3%。自然史资料的易变性反映出预后有赖于年龄、狭窄程度、高血压、冠心病及糖尿病等。故应根据这些因素选择治疗,而不应
The duration of the episode of transient ischemic attacks (TIAs) was previously designated 24 hours in the United States. Recent studies suggest that the majority of TIAs are transient, 24% terminate within 5 minutes, 39% terminate within 15 minutes, 50% terminate within 30 minutes, and 60% terminate within 1 hour. If the attack lasted for more than 1 to 2 hours may leave nerve damage and CT showed infarction. Information on the natural history of TIAs dates from 1973 and these data suggest that stroke may be 8% after the TIA in the first year, 5% in each of the following three years and about 3% in the subsequent years. The variability of natural history data reflects the prognosis depends on the age, stenosis, hypertension, coronary heart disease and diabetes. Therefore, treatment should be based on these factors, but not