title: Relationship Between Primary Patency and Lesion Length Following Bare Nitinol Stent Placement for Femoropopliteal Disease.
abstract: OBJECTIVE
  To evaluate the relationship between 1-year primary patency and lesion length in patients with femoropopliteal disease treated with bare nitinol stents.
  
  
  METHODS
  The study was a retrospective analysis of a prospectively maintained multicenter database. Between January 2004 and December 2011, 1047 consecutive patients (mean age 72 years; 765 men) underwent femoropopliteal stenting with nitinol stents in 1373 limbs. The mean vessel diameter was 5.3±0.7 mm and the mean lesion length was 142±75 mm. One-year follow-up data were collected and analyzed to ascertain which lesion length would be expected to demonstrate a 1-year primary patency above the established 66% objective performance goal (OPG).
  
  
  RESULTS
  The lower limit of the 95% confidence interval (CI) for the unadjusted 1-year primary patency was >66% when the lesion length was ≤243 mm. After adjustment of the covariates to match those of the OPG-derived population, the 1-year primary patency decreased linearly with longer lesion length. The 1-year primary patency was 83.2% (95% CI 79.8% to 86.1%) for a 100-mm lesion length, 76.4% (95% CI 71.7% to 80.5%) for a 200-mm lesion length, and 70.7% (95% CI 62.4% to 77.7%) for a 300-mm lesion length. The maximum lesion length providing a 1-year primary patency significantly greater than 66% was calculated to be 263 mm.
  
  
  CONCLUSIONS
  The 1-year primary patency of femoropopliteal lesions treated with bare nitinol stents decreased linearly with longer lesion length. The maximum lesion length providing a higher patency rate than the OPG of 66% was ~25 cm.
authors.affiliation: Department of Cardiology, Kokura Memorial Hospital, Kitakyushu, Japan sogacchy@yahoo.co.jp.
authors.forename: Yoshimitsu
authors.initials: Y
authors.lastname: Soga
authors.affiliation: Department of Metabolic Medicine, Osaka University Graduate School of Medicine, Suita, Japan Department of Diabetes Care Medicine, Osaka University Graduate School of Medicine, Suita, Japan.
authors.forename: Mitsuyoshi
authors.initials: M
authors.lastname: Takahara
authors.affiliation: Cardiovascular Center, Kansai Rosai Hospital, Amagasaki, Japan.
authors.forename: Osamu
authors.initials: O
authors.lastname: Iida
authors.affiliation: Department of Cardiology, Tokyo Saiseikai Central Hospital, Tokyo, Japan.
authors.forename: Kenji
authors.initials: K
authors.lastname: Suzuki
authors.affiliation: Department of Cardiology, Yokohama City Eastern Hospital, Yokohama, Japan.
authors.forename: Keisuke
authors.initials: K
authors.lastname: Hirano
authors.affiliation: Cardiovascular Division, Department of Internal Medicine, Hyogo College of Medicine, Nishinomiya, Japan.
authors.forename: Daizo
authors.initials: D
authors.lastname: Kawasaki
authors.affiliation: Department of Cardiology, Shin-Koga Hospital, Kurume, Japan.
authors.forename: Yoshiaki
authors.initials: Y
authors.lastname: Shintani
authors.affiliation: Department of Vascular Surgery, Matsuyama Red Cross Hospital, Matsuyama, Japan.
authors.forename: Terutoshi
authors.initials: T
authors.lastname: Yamaoka
authors.affiliation: Department of Cardiology, Kokura Memorial Hospital, Kitakyushu, Japan.
authors.forename: Kenji
authors.initials: K
authors.lastname: Ando
mesh_terms: D000368:Aged; D000497:Alloys; D050197:Atherosclerosis / Q000473:pathology* / Q000503:physiopathology / Q000601:surgery*; D057510:Endovascular Procedures; D005260:Female; D005263:Femoral Artery / Q000503:physiopathology; D006801:Humans; D008297:Male; D058729:Peripheral Arterial Disease / Q000473:pathology* / Q000503:physiopathology / Q000601:surgery*; D011150:Popliteal Artery / Q000503:physiopathology; D011474:Prosthesis Design; D012189:Retrospective Studies; D015607:Stents; D014654:Vascular Patency
chemical_list: D000497:Alloys; C013616:nitinol
keywords: endovascular therapy; femoropopliteal disease; lesion length; occlusion; patency; popliteal artery; stenosis; stent; superficial femoral artery