title: Mid-term clinical outcome and predictors of vessel patency after femoropopliteal stenting with self-expandable nitinol stent.
abstract: BACKGROUND
  Long-term clinical outcomes after femoropopliteal (FP) stenting with nitinol stents have not yet been clear. We investigated the mid-term efficacy of FP stenting with nitinol stents.
  
  
  METHODS
  This study was a multicenter retrospective study. From April 2004 to December 2008, 511 consecutive patients (639 limbs; mean age 71 +/- 7 years; 71% male) who underwent successful FP stenting with nitinol stents for de novo lesions were retrospectively selected and analyzed in this multicenter study. All patients had a minimum follow-up of 6 months. Restenosis was defined as >2.4 of peak systolic velocity ratio by duplex or >50% stenosis by angiogram. Primary patency was defined as treated vessels without restenosis and repeat revascularization. Secondary patency was defined as target vessels that become totally occluded and are reopened by repeat revascularization.
  
  
  RESULTS
  Sixty-one percent of the patients had diabetes, 76% were claudicant, and 20% were on hemodialysis. Mean lesion length was 151 +/- 75 mm. Mean follow-up period was 22 +/- 11 months. Primary patency was 79.8%, 66.7%, and 63.1%, and secondary patency was 90.4%, 87.3%, and 86.2% at 1, 3, and 5 years, respectively. During the follow-up period, 53 patients (10%) died. Of them, cardiovascular death was 38% and stent fracture had occurred in 14%. On multivariate analysis by Cox proportional hazard ratio, cilostazol administration (hazard ratio [HR], 0.52;P < .0001), stent fracture (HR, 1.6; P = .03), hemodialysis (HR, 1.7; P = .01), and Trans Atlantic Inter-Society Consensus (TASC) II class C/D (HR, 2.4; P < .0001) were the independent predictors of primary patency after successful FP stenting.
  
  
  CONCLUSIONS
  Clinical efficacy of nitinol stent implantation for FP disease was favorable for up to 5 years.
authors.affiliation: Department of Cardiology, Kokura Memorial Hospital, Kokurakita-ku, Kitakyushu, Japan. sogacchy@yahoo.co.jp
authors.forename: Yoshimitsu
authors.initials: Y
authors.lastname: Soga
authors.forename: Osamu
authors.initials: O
authors.lastname: Iida
authors.forename: Keisuke
authors.initials: K
authors.lastname: Hirano
authors.forename: Hiroyohi
authors.initials: H
authors.lastname: Yokoi
authors.forename: Shinsuke
authors.initials: S
authors.lastname: Nanto
authors.forename: Masakiyo
authors.initials: M
authors.lastname: Nobuyoshi
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000497:Alloys; D000800:Angioplasty, Balloon / Q000009:adverse effects / Q000295:instrumentation* / Q000401:mortality; D001157:Arterial Occlusive Diseases / Q000175:diagnosis / Q000401:mortality / Q000503:physiopathology / Q000628:therapy*; D016009:Chi-Square Distribution; D003251:Constriction, Pathologic; D005260:Female; D005263:Femoral Artery / Q000000981:diagnostic imaging / Q000503:physiopathology*; D006801:Humans; D007564:Japan; D053208:Kaplan-Meier Estimate; D008297:Male; D008875:Middle Aged; D011150:Popliteal Artery / Q000000981:diagnostic imaging / Q000503:physiopathology*; D016016:Proportional Hazards Models; D011474:Prosthesis Design; D011859:Radiography; D012008:Recurrence; D012189:Retrospective Studies; D018570:Risk Assessment; D012307:Risk Factors; D015607:Stents; D013997:Time Factors; D016896:Treatment Outcome; D018616:Ultrasonography, Doppler, Duplex; D014654:Vascular Patency
chemical_list: D000497:Alloys; C013616:nitinol