title: Mechanism of lumen gain with a novel rotational aspiration atherectomy system for peripheral arterial disease: examination by intravascular ultrasound.
abstract: OBJECTIVE
  The purpose of this study was to evaluate the mechanism of luminal gain with a novel atheroablation system (Pathway PV) for the treatment of peripheral artery disease using intravascular ultrasound (IVUS).
  
  
  METHODS
  The atherectomy system is a rotational atherectomy device, which employs expandable rotating blades with ports that allow flushing and aspiration of the plaque material or thrombus. In this first-in-man clinical study, IVUS analysis was available in 6 patients with lower limb ischemia treated with this device. The treatment results were assessed using IVUS at pre and post atherectomy. Lumen beyond burr size (LBB) was defined as lumen gain divided by the estimated burr area determined by the burr-size.
  
  
  RESULTS
  IVUS analysis was available in six patients (superficial femoral artery n=3, popliteal artery n=2, posterior tibial artery n=1). Atheroablation achieved a significant increase in lumen area (LA) (preintervention 3.9+/-0.4, postatheroablation 8.0+/-1.7 mm(2), P<.05), and significant reduction in plaque area (27.5+/-4.0, 23.7+/-3.1 mm(2), P=.001), while there was no change in the vessel area (31.3+/-4.2, 32.1+/-2.8 mm(2), P=.4). LBB was 57.4+/-51.3%.
  
  
  CONCLUSIONS
  This novel rotational aspiration atherectomy device achieved significant luminal gain by debulking in the absence of vessel stretching. The LA was greater than burr-sized lumen expectancy at cross-sections along the treated segments, suggesting a complimentary role of aspiration in luminal gain in atherosclerotic peripheral artery lesions.
authors.affiliation: Center for Research in Cardiovascular Interventions, Stanford University Medical Center, Stanford, CA 94305-5637, USA.
authors.forename: Ali H M
authors.initials: AH
authors.lastname: Hassan
authors.forename: Junya
authors.initials: J
authors.lastname: Ako
authors.forename: Katsuhisa
authors.initials: K
authors.lastname: Waseda
authors.forename: Yasuhiro
authors.initials: Y
authors.lastname: Honda
authors.forename: Thomas
authors.initials: T
authors.lastname: Zeller
authors.forename: Martin B
authors.initials: MB
authors.lastname: Leon
authors.forename: Peter J
authors.initials: PJ
authors.lastname: Fitzgerald
mesh_terms: D000368:Aged; D017073:Atherectomy / Q000295:instrumentation* / Q000379:methods; D017225:Atherectomy, Coronary / Q000295:instrumentation / Q000379:methods; D016009:Chi-Square Distribution; D004867:Equipment Design; D004869:Equipment Safety; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D016491:Peripheral Vascular Diseases / Q000000981:diagnostic imaging* / Q000628:therapy*; D011446:Prospective Studies; D018570:Risk Assessment; D012720:Severity of Illness Index; D015996:Survival Rate; D016896:Treatment Outcome; D018084:Ultrasonography, Interventional; D014654:Vascular Patency / Q000502:physiology