title: Long-term prognosis of patients with type B aortic intramural hematoma.
abstract: BACKGROUND
  The long-term clinical course of patients with type B aortic intramural hematoma (IMH) and predictors for progression remains unknown. The difference of aortic pathology may have a different impact on clinical course compared with classic aortic dissection (AD). The purpose of this study was to investigate long-term clinical course and predictors of progression in patients with type B IMH.
  
  
  RESULTS
  Clinical data were compared retrospectively between 53 patients with acute type B IMH (IMH group) and 57 patients with acute type B AD (AD group). All patients were treated initially with medical therapy. Two patients in IMH group and 14 patients in AD group underwent surgical repair because of aortic enlargement. The in-hospital mortality rate in IMH group was significantly lower than that in AD group (0% and 14%, P=0.006). Mean follow-up periods were 53+/-43 months, which revealed 3 and 5 late deaths, respectively. Eleven patients with IMH showed progression (development of aortic dissection or aortic enlargement) in follow-up imaging study. The actuarial survival rates in IMH group were 100%, 97%, and 97% at 1, 2, and 5 years, which were significantly higher than those in AD group (83%, 79%, and 79%) (P=0.009). Multivariate analysis identified age >70 years and new appearance of an ulcerlike projection as the strongest predictors of progression in patients with IMH.
  
  
  CONCLUSIONS
  Patients with type B IMH have better long-term prognosis than patients with AD. Older age and appearance of an ulcerlike projection are predictive for progression in patients with type B IMH.
authors.affiliation: Division of Cardiovascular Medicine and Department of Cardiovascular Surgery, Kawasaki Medical School, Kurashiki, Japan. skaji@kcgh.gr.jp
authors.forename: Shuichiro
authors.initials: S
authors.lastname: Kaji
authors.forename: Takashi
authors.initials: T
authors.lastname: Akasaka
authors.forename: Minako
authors.initials: M
authors.lastname: Katayama
authors.forename: Atsushi
authors.initials: A
authors.lastname: Yamamuro
authors.forename: Kenji
authors.initials: K
authors.lastname: Yamabe
authors.forename: Koichi
authors.initials: K
authors.lastname: Tamita
authors.forename: Maki
authors.initials: M
authors.lastname: Akiyama
authors.forename: Nozomi
authors.initials: N
authors.lastname: Watanabe
authors.forename: Kazuo
authors.initials: K
authors.lastname: Tanemoto
authors.forename: Shigefumi
authors.initials: S
authors.lastname: Morioka
authors.forename: Kiyoshi
authors.initials: K
authors.lastname: Yoshida
mesh_terms: D000368:Aged; D000784:Aortic Dissection / Q000175:diagnosis* / Q000000981:diagnostic imaging / Q000401:mortality; D001014:Aortic Aneurysm / Q000175:diagnosis* / Q000000981:diagnostic imaging / Q000401:mortality; D018450:Disease Progression; D005260:Female; D005500:Follow-Up Studies; D006406:Hematoma / Q000175:diagnosis* / Q000000981:diagnostic imaging / Q000401:mortality; D017052:Hospital Mortality; D006801:Humans; D008297:Male; D008875:Middle Aged; D011379:Prognosis; D012189:Retrospective Studies; D015996:Survival Rate; D014057:Tomography, X-Ray Computed