title: Hemodynamic outcome of endovascular therapy for TransAtlantic InterSociety Consensus type B femoropopliteal arterial occlusive lesions.
abstract: OBJECTIVE
  Endovascular therapy for moderate femoropopliteal arterial occlusive disease remains controversial. This study reviewed our experience with endovascular therapy for TransAtlantic InterSociety Consensus (TASC) type B disease, which is defined as multiple stenoses less than 3 cm in diameter or a single stenosis or occlusion 3 to 5 cm in diameter. Stenosis-free patency was used as an objective end point to evaluate the hemodynamic outcome.
  
  
  METHODS
  A retrospective review was performed of all patients who had undergone endovascular treatment of TASC type B lesions between 1997 and 2002 at two referral centers. Balloon angioplasty was performed in all patients. Stenting was used selectively as an adjunct in patients with suboptimal angioplasty results. The treated sites were examined with duplex ultrasound scanning at 6-month to 12-month intervals. Stenosis-free patency was defined as the absence of stenosis greater than 50% diameter in the treated arterial segment with standard duplex criteria.
  
  
  RESULTS
  One hundred fifteen limbs in 98 patients were studied. The indication for treatment was claudication in 92 patients (80%) and ischemic rest pain or gangrene in the remaining patients (20%). Multiple lesions greater than 3 cm were treated in 89 limbs (77%), and a single lesion 3 to 5 cm long was treated in 26 limbs (23%). Balloon angioplasty alone was performed in 74 limbs (65%), and angioplasty and adjunctive stenting was performed in 41 limbs (35%). Endovascular therapy was technically successful in all but one patient (99%), and there was no perioperative mortality or limb loss. During follow-up recurrent stenosis was detected in 46 limbs (40%), and reocclusion occurred in 11 limbs (10%). Seven patients (6%) underwent surgical bypass after endovascular treatment failure. The aggregate 1-year stenosis-free patency rate at life table analysis was 55.1%. The 1-year stenosis-free patency for angioplasty alone was 58%, compared with 51% (NS) for angioplasty and adjunctive stenting. Univariate regression analysis failed to demonstrate a difference in stenosis-free patency for demographic variables, medical comorbidities, and anatomic characteristics (multiple vs single lesions; number of angioplasty procedures).
  
  
  CONCLUSIONS
  Endovascular therapy for TASC type B femoropopliteal lesions is safe and technically feasible. However, the length of time that a treated arterial segment remains free of stenosis is limited, and is not improved with adjunctive stenting. Recurrent stenosis, not occlusion, was the most common study end point, and few patients subsequently required surgical bypass. Predictors of outcome after endovascular therapy for TASC type B lesions were not identified in this study.
authors.affiliation: University of Maryland School of Medicine, Baltimore, MD 21201, USA. mcostanza@smail.umaryland.edu
authors.forename: Michael J
authors.initials: MJ
authors.lastname: Costanza
authors.forename: Luis A
authors.initials: LA
authors.lastname: Queral
authors.forename: Michael P
authors.initials: MP
authors.lastname: Lilly
authors.forename: William R
authors.initials: WR
authors.lastname: Finn
mesh_terms: D000368:Aged; D000800:Angioplasty, Balloon; D001157:Arterial Occlusive Diseases / Q000000981:diagnostic imaging / Q000503:physiopathology* / Q000628:therapy*; D003251:Constriction, Pathologic / Q000000981:diagnostic imaging / Q000503:physiopathology / Q000628:therapy; D005260:Female; D005263:Femoral Artery; D005500:Follow-Up Studies; D006439:Hemodynamics / Q000502:physiology; D006801:Humans; D007383:Intermittent Claudication / Q000503:physiopathology / Q000628:therapy; D007511:Ischemia / Q000503:physiopathology / Q000628:therapy; D007866:Leg / Q000098:blood supply; D015993:Life Tables; D008297:Male; D011150:Popliteal Artery; D012008:Recurrence; D012189:Retrospective Studies; D015607:Stents; D013997:Time Factors; D014463:Ultrasonography; D014654:Vascular Patency