title: Prospective registry evaluating safety and efficacy of cobalt-chromium stent implantation in patients with de novo coronary lesions.
abstract: BACKGROUND
  Cobalt-chromium (Co-Cr) stents are a new type of endovascular prostheses characterised by better mechanical properties than traditional stainless steel stents.
  
  
  OBJECTIVE
  To assess the safety and efficacy of percutaneous coronary interventions (PCI) using the new Co-Cr Kos stent (Balton, Poland).
  
  
  METHODS
  A total of 59 patients with coronary artery diseases (76% men, aged 60+/-9 years, diabetes - 16.9%, smoking - 62.7%, 11.8% - acute myocardial infarction) underwent PCI for de novo lesions in native coronary vessels. The patients were followed for 6 months for the occurrence of cardiac events. Quantitative coronary angiography was performed at baseline and after 6 months.
  
  
  RESULTS
  In total, we implanted 62 stents in 59 coronary arteries. The mean diameter of the stents was 3.18+/-0.18 mm, and length - 14.62+/-2.12 mm. During a one-month follow-up period no cardiac events were noted. During a 6-month follow-up no death or new myocardial infarction were recorded. Control angiography was done in 55 (92%) subjects. Repeated target vessel revascularisation due to recurrent angina or in-stent restenosis was required in 10 (17%) patients; however, off-line core evaluation found significant re-narrowing in implanted stents (>50% diameter stenosis) only in 6 cases (10.9%). The mean late vessel lumen loss was 0.55+/-0.6 mm and stenosis 25.2+/-17.9%.
  
  
  CONCLUSIONS
  Implantation of the new Co-Cr Kos stent during PCI is safe and effective.
authors.affiliation: Department of Cardiology, Silesian Medical Center, Katowice, Poland.
authors.forename: Paweł
authors.initials: P
authors.lastname: Buszman
authors.forename: Stanisław
authors.initials: S
authors.lastname: Trznadel
authors.forename: Aleksander
authors.initials: A
authors.lastname: Zurakowski
authors.forename: Krzysztof
authors.initials: K
authors.lastname: Milewski
authors.forename: Leszek
authors.initials: L
authors.lastname: Kinasz
authors.forename: Marek
authors.initials: M
authors.lastname: Król
authors.forename: Marek
authors.initials: M
authors.lastname: Kondys
mesh_terms: D000368:Aged; D015906:Angioplasty, Balloon, Coronary; D001672:Biocompatible Materials; D002857:Chromium; D003035:Cobalt; D003324:Coronary Artery Disease / Q000628:therapy*; D023921:Coronary Stenosis / Q000628:therapy*; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D008875:Middle Aged; D012042:Registries; D015607:Stents; D013997:Time Factors; D016896:Treatment Outcome
chemical_list: D001672:Biocompatible Materials; D002857:Chromium; D003035:Cobalt