title: Vascular response to a third generation everolimus-eluting stent.
abstract: OBJECTIVE
  In a non-injured porcine coronary artery model, the aim was to evaluate vascular compatibility of the novel platinum chromium everolimus-eluting PROMUS Element stent as compared to the following control stents: everolimus-eluting PROMUS (XIENCE V), bare metal Element, and polymer-only Element.
  
  
  RESULTS
  Stent pairs (n=228) evenly distributed among the four stent types were implanted in overlap configuration in 79 pigs at a targeted stent-to-artery ratio of 1.1:1. Similar numbers were explanted at each of 7, 30, 90, 180, and 270 days for pathological analysis. No stent-related mortality or morbidity was observed. There were no stent occlusions or strut fractures. The PROMUS Element was more radiopaque than PROMUS (relative densities 9.9 and 9.1, respectively) and demonstrated at all time points vascular compatibility similar to that of the control stents for endothelial cell coverage, inflammatory response, and neointima formation. At 30 days, parastrut fibrin was mild but greater (P<0.0001) for the drug-eluting stents than either for the bare metal or the polymer-only Element; however, by 90 days the fibrin had dissipated.
  
  
  CONCLUSIONS
  In the non-injured porcine coronary artery model, the PROMUS Element demonstrated vascular compatibility equivalent to PROMUS and the bare metal and polymer-only stents.
authors.affiliation: Department of Pediatric Laboratory Medicine, Hospital for Sick Children, Toronto, Ontario, Canada. gregory.wilson@sickkids.ca
authors.forename: Gregory J
authors.initials: GJ
authors.lastname: Wilson
authors.forename: Barbara A
authors.initials: BA
authors.lastname: Huibregtse
authors.forename: Elizabeth A
authors.initials: EA
authors.lastname: Stejskal
authors.forename: Jody
authors.initials: J
authors.lastname: Crary
authors.forename: Ruth M
authors.initials: RM
authors.lastname: Starzyk
authors.forename: Keith D
authors.initials: KD
authors.lastname: Dawkins
authors.forename: James J
authors.initials: JJ
authors.lastname: Barry
mesh_terms: D000818:Animals; D003324:Coronary Artery Disease / Q000628:therapy*; D003331:Coronary Vessels / Q000473:pathology*; D054855:Drug-Eluting Stents / Q000009:adverse effects; D000068338:Everolimus; D007166:Immunosuppressive Agents / Q000008:administration & dosage*; D020123:Sirolimus / Q000008:administration & dosage / Q000031:analogs & derivatives*; D013552:Swine; D013997:Time Factors
chemical_list: D007166:Immunosuppressive Agents; D000068338:Everolimus; D020123:Sirolimus