title: Primary patency of long-segment self-expanding nitinol stents in the femoropopliteal arteries.
abstract: OBJECTIVE
  To report a retrospective cohort study of nitinol stent implantation in patients at high risk for restenosis owing to long-segment (> or =10 cm) femoropopliteal disease.
  
  
  METHODS
  Sixty-five consecutive patients with peripheral artery disease underwent long-segment (> or =10 cm) femoropopliteal stent implantation using self-expanding nitinol stents after initial failure of plain balloon angioplasty (i.e., residual stenosis >30% or a flow-limiting dissection). Patients were followed for first occurrence of in-stent restenosis, defined as a >50% lumen diameter reduction by color-coded duplex sonography, with angiographic confirmation.
  
  
  RESULTS
  Cumulative median length of the stented segments was 16 cm (interquartile range [IQR] 12-25, absolute range 10-40) using up to 5 overlapping stents. During the median 8-month follow-up (IQR 6-11), no early thrombotic reocclusions occurred within 30 days, but 26 (40%) patients developed an in-stent restenosis. Cumulative freedom from restenosis at 6 and 12 months was 79% and 54% overall, respectively; at the same time periods, the rates were 84% and 71% in nondiabetic patients (n=41) versus 68% and 22% in diabetics (n=24) (adjusted hazard ratio 3.8, p=0.01). Cumulative stent length and number of implanted stents were not associated with restenosis.
  
  
  CONCLUSIONS
  Midterm restenosis after long-segment femoropopliteal stenting using self-expanding nitinol stents remains a major problem, particularly in patients with diabetes mellitus. The midterm results in nondiabetics are encouraging.
authors.affiliation: Department of Angiology, University of Vienna, Medical School, A-1090 Vienna, Austria.
authors.forename: Schila
authors.initials: S
authors.lastname: Sabeti
authors.forename: Wolfgang
authors.initials: W
authors.lastname: Mlekusch
authors.forename: Jasmin
authors.initials: J
authors.lastname: Amighi
authors.forename: Erich
authors.initials: E
authors.lastname: Minar
authors.forename: Martin
authors.initials: M
authors.lastname: Schillinger
mesh_terms: D000368:Aged; D000497:Alloys; D000800:Angioplasty, Balloon / Q000295:instrumentation* / Q000379:methods; D001027:Aortography; D001157:Arterial Occlusive Diseases / Q000000981:diagnostic imaging / Q000628:therapy*; D015331:Cohort Studies; D016001:Confidence Intervals; D005260:Female; D005263:Femoral Artery / Q000000981:diagnostic imaging; D005500:Follow-Up Studies; D006801:Humans; D007511:Ischemia / Q000000981:diagnostic imaging / Q000628:therapy*; D007866:Leg / Q000098:blood supply*; D008297:Male; D008875:Middle Aged; D011150:Popliteal Artery / Q000000981:diagnostic imaging; D011336:Probability; D016016:Proportional Hazards Models; D011474:Prosthesis Design; D012189:Retrospective Studies; D018570:Risk Assessment; D012720:Severity of Illness Index; D018709:Statistics, Nonparametric; D015607:Stents; D016896:Treatment Outcome; D014654:Vascular Patency / Q000502:physiology
chemical_list: D000497:Alloys; C013616:nitinol