title: Post-interventional homocysteine levels: failure as a predictive biomarker of in-stent restenosis.
abstract: OBJECTIVE
  Purpose of our study was to determine if homocysteine plasma levels are related to the risk of in-stent restenosis after percutaneous coronary stent implantation in de novo lesions.
  
  
  BACKGROUND
  The putative role of homocysteine as a predictive cardiovascular biomarker of coronary artery disease is well established. The impact of homocysteine levels in the development of in-stent restenosis, however, is controversially discussed.
  
  
  METHODS
  A total of 177 patients with stable angina pectoris undergoing stent implantation in coronary de novo lesions were included. Laboratory determination comprised blood sample evaluation for homocysteine and other conventional risk factors before baseline coronary intervention and prior to six months control catheterization. Binary restenosis, late lumen loss, and late loss index after six months were assessed by quantitative coronary angiography. Endpoints included target lesion and target vessel failure, homocysteine levels as well as major adverse cardiac events.
  
  
  RESULTS
  There was a significant correlation between the length of the implanted stent (p<0.006), the percentage of stenosis (p<0.003) and the pre-interventional luminal diameter (p<0.0001) with late loss index. Linear regression analysis demonstrated no significant impact of the initial or six months homocysteine levels on angiographic restenosis, late lumen loss, or late loss index.
  
  
  CONCLUSIONS
  In contrast to homocysteine levels, luminal diameter, stent length and percentage of stenosis correlated with the appearance of restenosis. Taking our data into consideration, we hypothesise that homocysteine may not serve as a safe and independent biomarker of in-stent restenosis after a six months period following percutaneous coronary stenting.
authors.affiliation: Department of Cardiology, University Clinic Essen, 45122 Essen, Germany. Frank.Breuckmann@medizin.uni-essen.de
authors.forename: F
authors.initials: F
authors.lastname: Breuckmann
authors.forename: C
authors.initials: C
authors.lastname: Naber
authors.forename: J
authors.initials: J
authors.lastname: Beckert
authors.forename: A
authors.initials: A
authors.lastname: Schmermund
authors.forename: M
authors.initials: M
authors.lastname: Haude
authors.forename: D
authors.initials: D
authors.lastname: Baumgart
authors.forename: R
authors.initials: R
authors.lastname: Erbel
mesh_terms: D015906:Angioplasty, Balloon, Coronary; D015415:Biomarkers / Q000097:blood; D017023:Coronary Angiography; D003327:Coronary Disease / Q000628:therapy; D023903:Coronary Restenosis / Q000097:blood* / Q000000981:diagnostic imaging; D005260:Female; D006710:Homocysteine / Q000097:blood*; D006801:Humans; D008297:Male; D008875:Middle Aged; D011182:Postoperative Care; D011237:Predictive Value of Tests; D011247:Pregnancy; D018709:Statistics, Nonparametric; D015607:Stents
chemical_list: D015415:Biomarkers; D006710:Homocysteine