What are classifications of aortic dissection?

• DeBakey and colleagues initially classified aortic dissections as • type I: in which an intimal tear occurs in the ascending aorta but involves the descending aorta as well; • type II: in which the dissection is limited to the ascending aorta • type III: in which the intimal tear is located in the descending aorta with distal propagation of the dissection • Stanford is that of • type A: in which the dissection involves the ascending aorta (proximal dissection)， • type B: in which it is limited to the arch and/or descending aorta (distal dissection)