title: Impact of changing PSVR thresholds on the patency rates of SFA recanalisation with self-expanding nitinol stents.
abstract: OBJECTIVE
  The primary patency of superficial femoral artery (SFA) stents is evaluated by measuring PSVR. However, each trial uses a different definition of PSVR. We investigated the impact of changing PSVR thresholds on the patency rates of SFA recanalisation with self-expanding nitinol stents.
  
  
  RESULTS
  A single-centre retrospective study was conducted. Between 2003 and 2006, 76 consecutive patients (83 limbs) were treated using nitinol self-expanding stents for SFA disease. Primary patency was defined as categories 1 (PSVR <2.0), 2 (PSVR <2.4) and 3 (PSVR <2.85). The mean follow-up time was 51±27 months. For one, five, and seven years, Kaplan-Meier estimates for primary patency rates were 62.6%, 36.8%, and 27.6%, respectively, in category 1; 75.2%, 46.5%, and 37.1%, respectively, in 2; and 75.2%, 46.1%, and 46.1%, respectively, in 3. The primary patency between categories 1 and 3 (p=0.038) was significantly different. No difference was observed between categories 2 and 3 (p=0.786), and a trend for differences was observed between categories 1 and 2 (p=0.069).
  
  
  CONCLUSIONS
  PSVR definition may influence the reported long-term patency rate of a SFA stent. We should consider the definition of restenosis in each trial.
authors.affiliation: Department of Cardiology, Kishiwada Tokushukai Hospital, Kishiwada-city, Osaka, Japan.
authors.forename: Akihiro
authors.initials: A
authors.lastname: Higashimori
authors.forename: Osami
authors.initials: O
authors.lastname: Kawarada
authors.forename: Nobuyuki
authors.initials: N
authors.lastname: Morioka
authors.forename: Shinji
authors.initials: S
authors.lastname: Shiotani
authors.forename: Masahiko
authors.initials: M
authors.lastname: Fujihara
authors.forename: Keisuke
authors.initials: K
authors.lastname: Fukuda
authors.forename: Yoshiaki
authors.initials: Y
authors.lastname: Yokoi
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D000497:Alloys; D003251:Constriction, Pathologic; D005260:Female; D005263:Femoral Artery; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D008875:Middle Aged; D012189:Retrospective Studies; D015607:Stents; D014654:Vascular Patency / Q000187:drug effects / Q000502:physiology*
chemical_list: D000497:Alloys; C013616:nitinol