Application of the Type, Entry Site, and Malperfusion Classification in Treatment of Aortic Dissection.

Background: Our goal is to investigate a new practical dissection classification system, including type of dissection, location of the tear of the primary entry, and malperfusion.

Methods: The outcome of 151 patients with aortic dissection between January 2019 and May 2020 retrospectively were analyzed. All cases were classified with the Stanford dissection classification (A and B) by adding type non-A non-B. They were then further classified by the new classification system, including location of the primary Entry (E) and Malperfusion (M). All cases were followed up for six months.

Results: The distribution of 151 patients was 53.0%, 27.8%, and 19.2%, respectively, in type A, B, and non-A non-B. The in-hospital mortality rate was 8.8%, 2.4%, and 3.4% in type A, B, and non-A non-B (P < 0.05) and postoperative neurological complications occurred in 33.8%, 7.1%, and 13.8% in type A, B, and non-A non-B (P < 0.05). Total arch replacement was performed in 53.8%, 4.8%, and 13.8% in type A, B, and non-A non-B. The in-hospital mortality rate was 12.0%, 10.4%, and 8.5% in type E1, E2 and E3, while it was 20.0%, 10.4%, and 8.5% in type M1, M2 and M3 (P < 0.05).

Conclusions: The new practical dissection classification system is useful as a supplement to the Stanford dissection classification by regarding the extent of the disease process, aiding in decision-making about the operative indication and plan, and helping in anticipating prognosis.