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Diagnosis and Management of Aortic Disease

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10 Introduction Figure 7. Classification of Acute Aortic Dissection e DeBakey system categorizes dissections into types I, II, and III, based on the origin of the intimal tear and the extent of the dissection: • Type I: Dissection tear originates in the ascending aorta and propagates distally to include the aortic arch and typically the descending aorta • Type II: Dissection tear is confined only to the ascending aorta • Type III: Dissection tear originates in the descending thoracic aorta and propagates most often distally ▶ Type IIIa: Dissection tear is confined only to the descending thoracic aorta ▶ Type IIIb: Dissection tear originates in the descending thoracic aorta and extends below the diaphragm e Stanford classification system divides dissections into 2 categories according to whether the ascending aorta is involved or not, regardless of the site of origin: • Type A: All dissections involving the ascending aorta, irrespective of the site of the intimal tear • Type B: All dissections that do not involve the ascending aorta (including dissections that involve the aortic arch but spare the ascending aorta)

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