title: Optical coherence tomography evaluation of drug-eluting stents: a systematic review.
abstract: OBJECTIVE
  We performed a systematic review of studies reporting stent strut coverage and malapposition post implantation of different drug-eluting stent (DES), as assessed by optical coherence tomography (OCT).
  
  
  METHODS
  A review of publications and online databases in May 2011 retrieved 33 published studies reporting stent strut coverage and malapposition post-DES implantation using OCT: 24 for sirolimus-eluting stents (SES), 13 for paclitaxel-eluting stents (PES), 10 for zotarolimus-eluting stents (ZES), and two for everolimus-eluting stents (EES). The follow-up duration ranged from 3 months to 4 years. Stent strut coverage and malapposition were compared between DES at various time intervals post implantation.
  
  
  RESULTS
  Significant differences in stent strut coverage and malapposition exist between various DES. The SES had the highest frequency of uncovered struts at 3, 6, 9, and 12 months (13.1%, 10.9%, 8.1%, and 7.5%, respectively), followed by PES (5.5%, 4.4%, and 5.7% at 6, 9, and 12 months, respectively) and ZES (0.7%, 0%, and 0.5% at 3, 6, and 9 months, respectively) (P < 0.001 for all comparisons between stents). Only two studies reported 3.1% uncovered struts at 9 months with the EES. Stent strut malapposition at 6, 9, and 12 months was highest with SES (3.2%, 2.2%, and 1.2%, respectively) followed by PES (1.6%, 1.3%, and 0.9%, respectively), EES (0.46% at 9 months), and ZES (0.7% and 0.1% at 6 and 9 months, respectively).
  
  
  CONCLUSIONS
  SES had the highest rates of uncovered struts and malapposition, followed by PES and ZES. Such differences may explain the different clinical outcomes between various DES. © 2012 Wiley Periodicals, Inc.
authors.affiliation: University of Texas Southwestern Medical Center, Dallas, TX, USA.
authors.forename: Aristotelis C
authors.initials: AC
authors.lastname: Papayannis
authors.forename: Daisha
authors.initials: D
authors.lastname: Cipher
authors.forename: Subhash
authors.initials: S
authors.lastname: Banerjee
authors.forename: Emmanouil S
authors.initials: ES
authors.lastname: Brilakis
mesh_terms: D003324:Coronary Artery Disease / Q000473:pathology / Q000601:surgery*; D003331:Coronary Vessels / Q000473:pathology*; D054855:Drug-Eluting Stents; D006801:Humans; D009204:Myocardial Revascularization / Q000379:methods*; D041623:Tomography, Optical Coherence / Q000379:methods*