Which type of dissection is generally defined as being a surgical emergency?

Type A aortic dissections involve the ascending aorta and are considered surgical emergencies due to their potential for rapidly worsening complications, including rupture and life-threatening hemorrhage. This dissection type typically requires immediate surgical intervention because it can lead to severe damage to the heart and major vessels, creating a critical situation that demands urgent care.

In contrast, Type B dissections, which primarily affect the descending aorta, can often be managed medically unless there are significant complications. This difference significantly impacts the urgency and approach to treatment for the two types. Thus, Type A is characterized by its high risk and the immediate need for surgical correction, distinguishing it as a priority in emergency medical situations.