title: Degree of fusiform dilatation of the proximal descending aorta in type B acute aortic dissection can predict late aortic events.
abstract: OBJECTIVE
  Predicting the risk factors for late aortic events in patients with type B acute aortic dissection without complications may help to determine a therapeutic strategy for this disorder. We investigated whether late aortic events in type B acute aortic dissection can be predicted accurately by an index that expresses the degree of fusiform dilatation of the proximal descending aorta during the acute phase; this index can be calculated as follows: (maximum diameter of the proximal descending aorta)/(diameter of the distal aortic arch + diameter of the descending aorta at the pulmonary artery level).
  
  
  METHODS
  Patients with type B acute aortic dissection without complications (n = 141) were retrospectively analyzed to determine the predictors of late aortic events; these include aortic dilatation, rupture, refractory pain, organ ischemia, rapid aortic enlargement, and rapid enlargement of ulcer-like projections.
  
  
  RESULTS
  The fusiform index in patients with late aortic events (0.59) was higher than that in patients without late aortic events (0.53, P < .01). Patients with a higher fusiform index exhibited aortic dilatation earlier than those with a lower fusiform index. By multivariate analysis, we conclude that the predominant independent predictors of late aortic events were a maximum aortic diameter of 40 mm or more, a patent false lumen, and a fusiform index of 0.64 or more (hazard ratios, 3.18, 2.64, and 2.73, respectively). The values of actuarial freedom from aortic events for patients with all 3 predictors at 1, 5, and 10 years were 22%, 17%, and 8%, respectively, whereas the values in those without these predictors were 97%, 94%, and 90%, respectively.
  
  
  CONCLUSIONS
  The degree of fusiform dilatation of the proximal descending aorta, a patent false lumen, and a large aortic diameter can be predominant predictors of late aortic events in patients with type B acute aortic dissection. Patients with these predictors should be recommended to undergo early interventions (surgery or stent-graft implantation) or at least be closely followed up during the chronic phase before such events develop.
authors.affiliation: Department of Cardiovascular Surgery, Akane-Foundation Tsuchiya General Hospital, Hiroshima, Japan.
authors.forename: Akira
authors.initials: A
authors.lastname: Marui
authors.forename: Takaaki
authors.initials: T
authors.lastname: Mochizuki
authors.forename: Tadaaki
authors.initials: T
authors.lastname: Koyama
authors.forename: Norimasa
authors.initials: N
authors.lastname: Mitsui
mesh_terms: D000784:Aortic Dissection / Q000145:classification* / Q000150:complications / Q000628:therapy; D001014:Aortic Aneurysm / Q000145:classification* / Q000150:complications / Q000628:therapy; D001018:Aortic Diseases / Q000209:etiology; D004108:Dilatation, Pathologic; D018450:Disease Progression; D006801:Humans; D012189:Retrospective Studies; D012307:Risk Factors; D013997:Time Factors