主动脉内膜及中层破裂,血流进入主动脉壁,将主动脉壁剥离成为内、外两层,称为主动脉夹层,其原因主要有高血压、动脉硬化、动脉中层囊性坏死、主动脉缩窄、大动脉炎、外伤及梅毒等。国内病例青壮年多为先天性中层发育不良等,但近年来发病者动脉硬化、高血压的比例逐渐增高。其病 Aortic intima and middle rupture, blood flow into the aortic wall, the aortic wall peel into the inner and outer layers, known as the aortic dissection, the main causes of hypertension, arteriosclerosis, middle artery cystic necrosis, the main Artery narrowing, aortitis, trauma and syphilis. Most of the domestic cases of young and middle-aged idiopathic dysplasia, but the incidence of atherosclerosis in recent years, the proportion of high-pressure gradually increased. The disease