title: Clinical outcomes after percutaneous peripheral intervention for chronic total occlusion of superficial femoral arteries: comparison between self-expandable nitinol stent and stainless steel stent.
abstract: BACKGROUND
  It has been reported that nitinol stents provide higher patency in chronic phase than stainless steel stents after intervention to superficial femoral artery (SFA). However, there are few reports about stent patency for chronic total occlusion of SFA (SFA CTO).
  
  
  OBJECTIVE
  To compare clinical outcomes of self-expanding nitinol stents and stainless steel stents after percutaneous peripheral intervention (PPI) for SFA CTO.
  
  
  RESULTS
  Between April 2004 and August 2007, a total of 25 SFA CTO lesions (nitinol stent group, 13; stainless steel stent group, 12) in 21 patients were treated with PPI, all patients were followed clinically, and 21 lesions (nitinol, 9; stainless steel, 12) received follow-up angiography. There was no significant difference in baseline characteristics, mean stent diameter (7.3+/-0.7 mm vs. 6.9+/-1.2 mm, p=0.32), pre-ankle-brachial index (ABI), and Fontaine stage between groups. Mean occlusion length and stent length were significantly longer (129.5+/-54.9 mm vs. 39.0+/-20.6 mm, 250.8+/-90.0 mm vs. 145.2+/-64.6 mm, respectively, p<0.01) and number of stents was significantly larger (2.8+/-0.9 vs. 1.6+/-0.5, p<0.01) in the nitinol stent group. At follow-up, ABI was significantly lower (0.73+/-0.20 vs. 0.95+/-0.13, p=0.04), restenosis rate and target lesion revascularization was significantly higher (58.3% vs. 15.4%, p=0.03; 50.0% vs. 7.7%, p=0.02, respectively) in the stainless steel stent group.
  
  
  CONCLUSIONS
  Our study demonstrates the superiority of nitinol stent implantation compared with stainless steel stent implantation for SFA CTO.
authors.affiliation: Department of Cardiology, The Cardiovascular Institute, Minato-ku, Tokyo, Japan. yuu_nakagawa1978@yahoo.co.jp
authors.forename: Yuya
authors.initials: Y
authors.lastname: Nakagawa
authors.forename: Junji
authors.initials: J
authors.lastname: Yajima
authors.forename: Yuji
authors.initials: Y
authors.lastname: Oikawa
authors.forename: Ken
authors.initials: K
authors.lastname: Ogasawara
authors.forename: Hajime
authors.initials: H
authors.lastname: Kirigaya
authors.forename: Kazuyuki
authors.initials: K
authors.lastname: Nagashima
authors.forename: Ryuichi
authors.initials: R
authors.lastname: Funada
authors.forename: Shunsuke
authors.initials: S
authors.lastname: Matsuno
authors.forename: Toshiro
authors.initials: T
authors.lastname: Inaba
authors.forename: Michinari
authors.initials: M
authors.lastname: Nakamura
authors.forename: Hitoshi
authors.initials: H
authors.lastname: Sawada
authors.forename: Tadanori
authors.initials: T
authors.lastname: Aizawa
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D000497:Alloys; D017130:Angioplasty; D001157:Arterial Occlusive Diseases / Q000628:therapy*; D002908:Chronic Disease; D054855:Drug-Eluting Stents; D005260:Female; D005263:Femoral Artery / Q000000981:diagnostic imaging; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D008875:Middle Aged; D011859:Radiography; D013193:Stainless Steel; D016896:Treatment Outcome
chemical_list: D000497:Alloys; D013193:Stainless Steel; C013616:nitinol