title: Is there delayed restenosis in patients with coronary artery disease treated with sirolimus-eluting stent?
abstract: BACKGROUND
  Although long-term follow-up after sirolimus-eluting stent implantation shows a sustained clinical benefit in several randomized and registered trials, little is known about the pattern of neointimal growth beyond the first 6 to 9 months. In this study, we therefore evaluated the possible delayed restenosis in patients with coronary artery disease treated with sirolimus-eluting stent.
  
  
  METHODS
  A total of consecutive 333 patients with 453 lesions were enrolled in this study (among 782 consecutive patients with 1023 lesions). Lesions were subjected to follow-up by quantitative coronary angiography, and patients were divided into two groups according to the time of follow-up by quantitative coronary angiography: early group (< or =270 days, n=270 with 369 lesions) and late group (>270 days, n=63 with 84 lesions). Binary restenosis was defined as stenosis of more than 50% of the lumen diameter in the target lesion.
  
  
  RESULTS
  Baseline clinical, demographic or angiographic characteristics were well balanced between the two groups. The in-stent restenosis rate was not significant between the early group and the late group (3.5 vs. 6.0%; P>0.05). The late loss and target lesion revascularization appeared higher in late group but there were no significant differences (0.15+/-0.38 mm vs. 0.24+/-0.44 mm; and 4.9 vs. 9.5%, P>0.05, respectively). Similarly, overall thrombosis rate was also same in both groups. In-segment restenosis was, however, higher in late group compared with that in early group (7.9 vs. 16.7%, P=0.013).
  
  
  CONCLUSIONS
  In this unrestricted population, the beneficial effects of sirolimus-eluting stent implantation extend out more than 1 year in real world practice, that has been confirmed by the results of the large randomized clinical trials. The late in-segment restenosis could, however, be found, suggesting that a prolonged clinical and angiographic surveillance in this subset of patients seems to be warranted.
authors.affiliation: Department of Cardiology, Fu Wai Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, People's Republic of China. lijnjn@yahoo.com.cn
authors.forename: Jian-Jun
authors.initials: JJ
authors.lastname: Li
authors.forename: Bo
authors.initials: B
authors.lastname: Xu
authors.forename: Yue-Jin
authors.initials: YJ
authors.lastname: Yang
authors.forename: Ji-Lin
authors.initials: JL
authors.lastname: Chen
authors.forename: Shu-Bing
authors.initials: SB
authors.lastname: Qiao
authors.forename: Wei-Hua
authors.initials: WH
authors.lastname: Ma
authors.forename: Xue-Wen
authors.initials: XW
authors.lastname: Qin
authors.forename: Min
authors.initials: M
authors.lastname: Yao
authors.forename: Hai-Bo
authors.initials: HB
authors.lastname: Liu
authors.forename: Yong-Jian
authors.initials: YJ
authors.lastname: Wu
authors.forename: Jin-Qing
authors.initials: JQ
authors.lastname: Yuan
authors.forename: Jue
authors.initials: J
authors.lastname: Chen
authors.forename: Shi-Jie
authors.initials: SJ
authors.lastname: You
authors.forename: Jun
authors.initials: J
authors.lastname: Dai
authors.forename: Ran
authors.initials: R
authors.lastname: Xia
authors.forename: Run-Lin
authors.initials: RL
authors.lastname: Gao
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D017023:Coronary Angiography; D003324:Coronary Artery Disease / Q000000981:diagnostic imaging / Q000188:drug therapy / Q000601:surgery*; D023903:Coronary Restenosis / Q000000981:diagnostic imaging / Q000517:prevention & control*; D003692:Delayed-Action Preparations; D005260:Female; D006801:Humans; D007166:Immunosuppressive Agents / Q000008:administration & dosage*; D008297:Male; D008875:Middle Aged; D012189:Retrospective Studies; D020123:Sirolimus / Q000008:administration & dosage*; D015607:Stents; D016896:Treatment Outcome
chemical_list: D003692:Delayed-Action Preparations; D007166:Immunosuppressive Agents; D020123:Sirolimus