Aortic dissection is characterized by detachment of the intima and by the entry of high-pressure flow into the disrupted media. Three types of aortic dissections can be distinguished, according to the classification of DeBakey. In type I the entry is in the ascending aorta, and the dissection extends to the descending aorta; in type II the dissection does not extend beyond the arch; in type III, the dissection is confined to the descending aorta. TEE represents a highly accurate method for the diagnosis of aortic dissections and for evaluating flow dynamics in the true and false lumen.
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