title: Orbital atherectomy for infrapopliteal disease: device concept and outcome data for the OASIS trial.
abstract: OBJECTIVE
  The purpose of this study was to assess the safety and short-term efficacy of orbital atherectomy for chronic infrapopliteal arterial occlusive disease.
  
  
  BACKGROUND
  Infrapopliteal occlusive disease is a common cause of critical limb ischemia and claudication. There are no American College of Cardiology/American Heart Association guidelines for infrapopliteal revascularization for chronic limb ischemia.
  
  
  METHODS
  One hundred twenty four patients (201 stenoses) were enrolled in a prospective non-randomized multicenter registry of orbital atherectomy for severe infrapopliteal disease. Data were collected as part of an investigational device exemption from the Food and Drug Administration.
  
  
  RESULTS
  The primary safety endpoint of major adverse events (MAE) at 30-days (death, myocardial infarction, amputation, or repeat revascularization) was observed in four patients (3.2%). The primary efficacy endpoint (final diameter stenosis) was 17.8 +/- 13.5%. The secondary endpoints of procedural success (final diameter stenosis < or =30%) and 6 month MAE (death, amputation, or target vessel revascularization) were observed in 90.1 and 10.4% of patients, respectively. Stand-alone atherectomy was performed in 116 lesions (57.4%). At 6-months, no patients required surgical bypass or unplanned amputation, and improvement in Rutherford ordinal scale was observed in 78.2% of patients.
  
  
  CONCLUSIONS
  Orbital atherectomy is a unique approach to infrapopliteal disease, and provides predictable and safe lumen enlargement. Short-term data demonstrate substantial symptomatic improvement and infrequent need for further revascularization or amputation.
authors.affiliation: Department of Cardiovascular Medicine, William Beaumont Hospital, Royal Oak, Michigan 48073, USA. rsafian@beaumont.edu
authors.forename: Robert D
authors.initials: RD
authors.lastname: Safian
authors.forename: Khusrow
authors.initials: K
authors.lastname: Niazi
authors.forename: John P
authors.initials: JP
authors.lastname: Runyon
authors.forename: Dan
authors.initials: D
authors.lastname: Dulas
authors.forename: Barry
authors.initials: B
authors.lastname: Weinstock
authors.forename: Venkatesh
authors.initials: V
authors.lastname: Ramaiah
authors.forename: Richard
authors.initials: R
authors.lastname: Heuser
mesh_terms: D001157:Arterial Occlusive Diseases / Q000601:surgery*; D017073:Atherectomy / Q000295:instrumentation / Q000379:methods*; D002986:Clinical Trials as Topic; D006801:Humans; D007383:Intermittent Claudication / Q000601:surgery; D007511:Ischemia / Q000601:surgery; D007866:Leg / Q000098:blood supply*; D017063:Outcome Assessment, Health Care; D011150:Popliteal Artery / Q000601:surgery*