Endovascular stent-grafts for acute and chronic type B aortic dissection: comparison of clinical outcomes.
BACKGROUND
Endovascular stent-graft treatment has emerged as an alternative for patients with type B aortic dissection (AD), either at acute or chronic phase, in selected patients. This study aimed to investigate the results of endovascular stent-graft repair for acute and chronic type B AD.


METHODS
From May 2002 to July 2007, 67 patients with type B AD were treated by endovascular stent-graft placement. There were 32 patients in the acute phase (AAD group) and 35 patients in the chronic phase (CAD group). The patients were followed up from 1 to 65 months (average, 17 +/- 16 months). The immediate and follow-up clinical outcomes were documented and compared between the 2 groups.


RESULTS
Placement of endovascular stent-grafts across the primary entry tears was technically successful in all 67 patients. Compared with patients in the CAD group, those in the AAD group had higher percentages of pleural effusion (15.6% vs 0, P = 0.02) and visceral/leg ischemia (21.9% vs 2.9%, P = 0.02). Procedure related complications, including endoleak and post-implantation syndrome occurred more frequently in AAD group than in CAD group (21.9% vs 2.9% and 31.3% vs 8.6%, respectively; P = 0.02 and P = 0.02). Kaplan-Meier analysis showed no significant difference in survival rate at 4 years between the 2 groups (86.4% vs 92.3%, P = 0.42 by Log-rank test). But the 4-year event-free survival rate was higher in patients with chronic dissection than in patients with acute dissection (96.2% vs 73.9%; P = 0.02 by Log-rank test).


CONCLUSIONS
Endovascular repair with stent-graft was safe and effective for the treatment of both acute and chronic type B AD. However, both immediate and long term major complications occurred more frequently in patients with acute dissection than in those with chronic dissection.
Jing
Quan-min
QM
Department of Cardiology, Shenyang Northern Hospital, Shenyang, Liaoning 110016, China.
Han
Ya-ling
YL
Wang
Xiao-zeng
XZ
Deng
Jie
J
Luan
Bo
B
Jin
Hong-xu
HX
Liu
Xiao-jiang
XJ
Li
Fei
F
D000208:Acute Disease; D000368:Aged; D000784:Aortic Dissection / Q000628:therapy*; D017545:Aortic Aneurysm, Thoracic / Q000628:therapy*; D019917:Blood Vessel Prosthesis Implantation; D002908:Chronic Disease; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D015607:Stents; D016896:Treatment Outcome