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有些研究提供了短暂脑缺血发作(TIA)的自然病程。发病后五年内,每年约有5%到6%发展成完全型中风,此后发生率逐见降低。但大部分中风发生于TIA后的第一年,尤其是开始几个月内。椎基动脉系统的TIA予后较好,有颈动脉系统症状的病人予后较差,但是椎基动脉系病变表现有较偏瘫者予后也差。与之相反,椎基动脉系病人的TIA发作次数频繁,却不易发展成完全型中风。
Some studies provide a natural history of transient ischemic attacks (TIA). Within five years after the onset of symptoms, about 5% to 6% of all cases develop a complete stroke each year, and the incidence rate decreases from one case to another. However, most strokes occur in the first year following TIA, especially in the first few months. Vertebrobasilar TIA better after the system, with carotid system symptoms in patients with poor prognosis, but the performance of vertebrobasilar lesions were worse than those who were given after the poor. In contrast, patients with vertebrobasilar artery have a high frequency of TIA episodes but are less likely to develop a complete stroke.