Aortic dissection involves a tear in the medical layer of the aortic wall, causing blood to extravasate into the media and thus compromising blood flow to the brain, heart, and other organs. Usually the causative factor is an underlying disease of the media. Dissection can be classified by the sites involved:
1. DeBakey type I – ascending aorta beyond arch.
2. DeBakey type II – ascending aorta.
3. DeBakey type III – descending aorta.
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