title: Impact of vessel size on outcome after implantation of sirolimus-eluting and paclitaxel-eluting stents: a subgroup analysis of the SIRTAX trial.
abstract: OBJECTIVE
  We assessed the impact of vessel size on angiographic and long-term clinical outcome after percutaneous coronary intervention (PCI) with sirolimus-eluting stents (SES) and paclitaxel-eluting stents (PES) within a randomized trial (SIRTAX [Sirolimus-Eluting Stent Compared With Paclitaxel-Eluting Stent for Coronary Revascularization]).
  
  
  BACKGROUND
  Percutaneous coronary intervention in small-vessel disease is associated with an increased risk of major adverse cardiac events (MACE).
  
  
  METHODS
  A total of 1,012 patients were randomly assigned to treatment with SES (n = 503) or PES (n = 509). A stratified analysis of angiographic and clinical outcome was performed up to 2 years after PCI according to size of the treated vessel (reference vessel diameter < or =2.75 vs. >2.75 mm).
  
  
  RESULTS
  Of 1,012 patients, 370 patients (37%) with 495 lesions underwent stent implantation in small vessels only, 504 patients (50%) with 613 lesions in large vessels only, and 138 patients (14%) with 301 lesions in both small and large vessels (mixed). In patients with small-vessel stents, SES reduced MACE by 55% (10.4% vs. 21.4%; p = 0.004), mainly driven by a 69% reduction of target lesion revascularization (TLR) (6.0% vs. 17.7%; p = 0.001) compared with PES at 2 years. In patients with large- and mixed-vessel stents, rates of MACE (large: 10.4% vs. 13.1%; p = 0.33; mixed: 16.7% vs. 18.0%; p = 0.83) and TLR (large: 6.9% vs. 8.6%; p = 0.47; mixed: 16.7% vs. 15.4%; p = 0.86) were similar for SES and PES. There were no significant differences with respect to death and myocardial infarction between the 3 groups.
  
  
  CONCLUSIONS
  Compared with PES, SES more effectively reduced MACE and TLR in small-vessel disease. Differences between SES and PES appear less pronounced in patients with large- and mixed-vessel disease. (The SIRTAX trial; http://clinicaltrials.gov/ct/show/NCT00297661?order=1; NCT00297661).
authors.affiliation: Department of Cardiology, University Hospital Bern, Switzerland.
authors.forename: Mario
authors.initials: M
authors.lastname: Togni
authors.forename: Stéphanie
authors.initials: S
authors.lastname: Eber
authors.forename: Jeannette
authors.initials: J
authors.lastname: Widmer
authors.forename: Michael
authors.initials: M
authors.lastname: Billinger
authors.forename: Peter
authors.initials: P
authors.lastname: Wenaweser
authors.forename: Stéphane
authors.initials: S
authors.lastname: Cook
authors.forename: Rolf
authors.initials: R
authors.lastname: Vogel
authors.forename: Christian
authors.initials: C
authors.lastname: Seiler
authors.forename: Franz R
authors.initials: FR
authors.lastname: Eberli
authors.forename: Willibald
authors.initials: W
authors.lastname: Maier
authors.forename: Roberto
authors.initials: R
authors.lastname: Corti
authors.forename: Marco
authors.initials: M
authors.lastname: Roffi
authors.forename: Thomas F
authors.initials: TF
authors.lastname: Lüscher
authors.forename: Ali
authors.initials: A
authors.lastname: Garachemani
authors.forename: Otto M
authors.initials: OM
authors.lastname: Hess
authors.forename: Simon
authors.initials: S
authors.lastname: Wandel
authors.forename: Bernhard
authors.initials: B
authors.lastname: Meier
authors.forename: Peter
authors.initials: P
authors.lastname: Jüni
authors.forename: Stephan
authors.initials: S
authors.lastname: Windecker
mesh_terms: D000368:Aged; D015906:Angioplasty, Balloon, Coronary / Q000009:adverse effects / Q000379:methods*; D016001:Confidence Intervals; D017023:Coronary Angiography; D023903:Coronary Restenosis / Q000517:prevention & control; D023921:Coronary Stenosis / Q000000981:diagnostic imaging / Q000628:therapy*; D003331:Coronary Vessels / Q000033:anatomy & histology; D004311:Double-Blind Method; D016503:Drug Delivery Systems; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D017239:Paclitaxel / Q000008:administration & dosage*; D011336:Probability; D016016:Proportional Hazards Models; D011446:Prospective Studies; D018570:Risk Assessment; D012720:Severity of Illness Index; D020123:Sirolimus / Q000008:administration & dosage*; D015607:Stents; D016896:Treatment Outcome
chemical_list: D017239:Paclitaxel; D020123:Sirolimus