What does a DeBakey type III dissection affect?

A DeBakey type III dissection primarily affects the descending aorta. This type of aortic dissection starts in the first part of the descending aorta, typically below the left subclavian artery, and can extend along it but does not involve the ascending aorta or aortic arch.

Understanding aortic dissections requires familiarity with the classifications, as they are crucial for determining management and treatment strategies. DeBakey type III dissections are often divided into three subtypes: IIIA, which extends into the abdominal aorta, and IIIB, which remains confined to the thoracic aorta. The critical point is that type III dissections are characterized by their initiation specifically in the descending aorta, differentiating them from type I and type II dissections, which can affect the ascending aorta and the arch.

This focused impact on the descending segment is vital for clinical decisions since it implies that patients may need tailored approaches to treatment, particularly in terms of surgical intervention or monitoring for complications.