title: The TransAtlantic InterSociety Consensus (TASC) classification system in iliac arterial stent placement: long-term patency and clinical limitations.
abstract: OBJECTIVE
  To evaluate the long-term patency of iliac arterial stent placement according to individual TransAtlantic Intersociety Consensus (TASC) stages and demonstrate the limitations of TASC classification for iliac arterial disease.
  
  
  METHODS
  Retrospective analysis of 218 patients who underwent iliac arterial stent placement revealed 295 stents were placed in 260 limbs. Iliac lesions of patients were classified according to the TASC classification on initial angiography but patients having bilateral different staged lesion were classified with limb based TASC classification. Analysis was performed based on the number of treated limbs not on the number of patients. Stent patency of individual TASC stages was analyzed by Kaplan-Meier methods and were compared by the log rank test.
  
  
  RESULTS
  The technical success rate was 99%. 171 patients (80%) were classified under a single TASC category, however, 44 patients (20%) with bilateral iliac lesions could not be classified under a single TASC stage. The number of patients and limbs in each TASC group was: TASC A (88/97), TASC B (91/97), TASC C (32/48), and TASC D (16/18). The 1, 3 and 5 year primary patencies of the iliac arterial stent for TASC A were 96%, 84%, and 81%; TASC B were 95%, 85%, and 85%; TASC C were 94%, 94%, and 78%; and TASC D were 93%, 74%, and 74%, respectively. Four TASC groups were not statistically different for primary patency rates (P < .03).
  
  
  CONCLUSIONS
  The patency of iliac arterial stents did not show statistically significant difference among TASC stages. TASC system is limited for patient classification with bilateral iliac arterial disease [corrected]
authors.affiliation: Department of Radiology and the Center for Imaging Science, Samsung Medical Center, Sungkyunkwan University School of Medicine, 50, Irwon-dong, Gangnam gu, Seoul, 135-710, Korea.
authors.forename: Kwang Bo
authors.initials: KB
authors.lastname: Park
authors.forename: Young Soo
authors.initials: YS
authors.lastname: Do
authors.forename: Dong Ik
authors.initials: DI
authors.lastname: Kim
authors.forename: Duk Kyung
authors.initials: DK
authors.lastname: Kim
authors.forename: Young Wook
authors.initials: YW
authors.lastname: Kim
authors.forename: Sung Wook
authors.initials: SW
authors.lastname: Shin
authors.forename: Sung Ki
authors.initials: SK
authors.lastname: Cho
authors.forename: Sung Wook
authors.initials: SW
authors.lastname: Choo
authors.forename: Yeon Hyeon
authors.initials: YH
authors.lastname: Choe
authors.forename: In-Wook
authors.initials: IW
authors.lastname: Choo
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D001157:Arterial Occlusive Diseases / Q000145:classification* / Q000628:therapy*; D001807:Blood Vessel Prosthesis; D002404:Catheterization; D005260:Female; D006801:Humans; D007083:Iliac Artery / Q000000981:diagnostic imaging / Q000601:surgery*; D007866:Leg / Q000098:blood supply; D008297:Male; D008875:Middle Aged; D011859:Radiography; D012189:Retrospective Studies; D012720:Severity of Illness Index; D015607:Stents; D016896:Treatment Outcome; D014463:Ultrasonography; D014654:Vascular Patency