Aortic dissection was originally classified by DeBakey et al.12 based on the site of intimal tear and the extent of dissection. The Stanford classification proposed by Daily et al. five years later is based on the presence or absence
of ascending aortic involvement irrespective of the entry site13 (Figure 4.4). The later classification is widely used because of its clinical value. Patients with involvement of the ascending aorta have a poor outcome unless operated emergently14-16. Aortic dissection is further classified as acute or chronic based on symptom duration of less than or greater than 2 weeks17.
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