title: [Evaluation of the late stent malposition after drug-eluting stent implantation by optical coherence tomography].
abstract: OBJECTIVE
  To evaluate the characteristic of late stent malposition after drug-eluting stent implantation by optical coherence tomography (OCT).
  
  
  METHODS
  The study comprised of 32 patients (target vessels: 51, total stents: 71) underwent drug eluting stent implantation one year ago [average (14.8 +/- 5.2) months]. OCT images of the stent were analyzed at interval of 0.5 mm. The stent malposition was detected, the thickness of intima and gap between the stent strut and vessel wall were measured.
  
  
  RESULTS
  Stent malposition was detected in 7 patients without clinical cardiac events, including positive remodeling (n = 4), overlapping stents (n = 1) and stent struts covered with thrombus (n = 2). Stent strut apposition with complete intima coverage was about 97.6%, stent struts malposition was 2.4% including half of struts located at the ostium of side branch. The intima coverage of stent struts is similar between the struts at the side branch and others [(0.06 +/- 0.05) mm vs. (0.05 +/- 0.03) mm, P > 0.05].
  
  
  CONCLUSIONS
  The causes of late stent malposition include the primary malposition after stent implantation, positive remodeling, overlapping stents and stent struts located at the ostium of side branch. Thinner intima coverage was also observed on the stent struts with malposition.
authors: Department of Cardiovascular, Chinese People's Liberation Army General Hospital, Beijing 100853, China.
authors: Feng
authors: F
authors: Tian
authors: Yun-dai
authors: YD
authors: Chen
authors: Zhi-jun
authors: ZJ
authors: Sun
authors: Lian
authors: L
authors: Chen
authors: Hong-bin
authors: HB
authors: Liu
authors: Ting-shu
authors: TS
authors: Yang
authors: Chang-fu
authors: CF
authors: Liu
authors: Qin-hua
authors: QH
authors: Jin
authors: Qi-cai
authors: QC
authors: Bai
mesh_terms: D000368:Aged; D054855:Drug-Eluting Stents; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D041623:Tomography, Optical Coherence; D017211:Treatment Failure