主动脉夹层(AD)是指主动脉腔内血液从主动脉内膜撕裂处进入主动脉中膜,使中膜分离,并沿主动脉长轴方向扩展,形成主动脉壁的二层分离状态,又称主动脉壁间动脉瘤或主动脉分裂[1]。本病少见,发病率为每年每百万人口中5~10例,但AD起病突然,临床表现复杂多变,发病24 h内死亡率高达40 Aortic dissection (AD) refers to the aortic lumen blood from the aortic intimal tear into the aorta, the media separation, and along the long axis of the aortic expansion, the formation of aortic wall of the second separation , Also known as aortic aneurysm or aortic dissection [1]. The rare disease, the incidence rate of 5 to 10 cases per million population per year, but suddenly onset of AD, complicated and changing clinical manifestations, the incidence of death within 24 h up to 40