短暂脑局部缺血发作(Transient ischemic att-acks,简称 TIA)是颈动脉或椎基动脉系统的短暂血液供应不足,临床表现为突然发病的、几分钟至几小时的局灶性神经功能缺失,多在24小时以内完全恢复,但可有反复发作。虽然很早注意到这种短暂的、可逆的、反复的急性脑缺血发作,但其重要临床意义是在近年来才引起广泛的重视。这是由于:(1)TIA Transient ischemic att-acks (TIA) is a transient lack of blood supply to the carotid or vertebral artery system. The clinical manifestations are sudden onset, focal neurological deficits lasting minutes to hours, More fully recovered within 24 hours, but may have recurrent. Although this brief, reversible, and recurrent acute ischemic attack has been noted long ago, its important clinical significance has drawn wide attention in recent years. This is due to: (1) TIA