title: Comparison of long-term clinical outcome between patients with chronic versus acute type B aortic dissection treated by implantation of a stent graft: a single-center report.
abstract: BACKGROUND
  Stent grafting for treatment of type B aortic dissection has been extensively used. However, the difference in the long-term clinical outcome between patients with chronic versus acute type B aortic dissection remains unknown. This study aimed to analyze the difference in long-term clinical outcome after endovascular repair for patients with chronic (≥2 weeks) versus acute (<2 weeks) type B aortic dissection.
  
  
  METHODS
  Between May 2000 and June 2011, a total of 174 patients with type B aortic dissection (56 chronic, 118 acute) treated by endovascular repair were studied prospectively. Follow-up three-dimensional computed tomography scanning and aortoangiography were scheduled at 3-6 months after the index procedure. Propensity score matching was used to compare the difference in the endpoint between the two groups.
  
  
  RESULTS
  The procedure-related event rate was 18.6% in the acute group and 5.4% in the chronic group (P = 0.021), but this difference became nonsignificant after propensity score matching. At the end of follow-up (mean 2.49 years), overall and aorta-related mortality was 11.0% and 7.6%, respectively, in the acute group, and was not significantly different from that in the chronic group (3.6% and 3.6%, P = 0.148 and P = 0.506, respectively). Both false and true lumina showed significant remodeling over time, with >93% complete false-lumen thrombosis. Untreated tear and type I endoleak were predictors of clinical events during follow-up.
  
  
  CONCLUSIONS
  Comparable long-term clinical results were achieved in patients with chronic or acute type B aortic dissection after implantation of a stent graft.
authors: Nanjing First Hospital, Nanjing Medical University, Nanjing, People's Republic of China.
authors: Shao-Liang
authors: SL
authors: Chen
authors: Jian-Cheng
authors: JC
authors: Zhu
authors: Xiao-Bo
authors: XB
authors: Li
authors: Fei
authors: F
authors: Ye
authors: Jun-Jie
authors: JJ
authors: Zhang
authors: Zhi-Zhong
authors: ZZ
authors: Liu
authors: Nai-Liang
authors: NL
authors: Tian
authors: Song
authors: S
authors: Lin
authors: Cheng-Yu
authors: CY
authors: Lv
keywords: aortic dissection; endovascular repair; procedure-related events; propensity score matching
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