title: Crossover chimney technique to preserve the internal iliac artery during endovascular repair of iliac or aortoiliac aneurysms: midterm results.
abstract: OBJECTIVE
  To report our midterm results of the crossover chimney technique to preserve the internal iliac artery (IIA) in patients with aortoiliac aneurysms (AIA) and isolated common iliac artery aneurysms (CIAA).
  
  
  METHODS
  Between May 2012 and January 2014, 14 consecutive patients (mean age 77.3 years; all men) with 17 AIA, isolated CIAAs, or abdominal aortic aneurysms with short CIAs underwent elective endovascular aneurysm repair (EVAR) with the crossover chimney technique to preserve the IIA. Follow-up assessment, including computed tomographic angiography or duplex ultrasound, was performed at 1, 6, and 12 months and annually thereafter.
  
  
  RESULTS
  Technical success, defined as successful preservation of IIA without intraoperative type I or III endoleak, was 100%. Over a mean 14.3 months (range 6-21), primary patency was 92.8%. There was no early or late procedure-related mortality. Among the 17 iliac aneurysms excluded, the sac diameter significantly (at least 5 mm) decreased in 3, decreased <5 mm in 10, and did not change in 4.
  
  
  CONCLUSIONS
  The crossover chimney technique is a simple and safe alternative for IIA endovascular revascularization with high technical success and acceptable midterm patency.
authors: Division of Cardiovascular Surgery, Department of Surgery, National Taiwan University Hospital, Taipei, Taiwan Graduate Institute of Clinical Medicine, College of Medicine, National Taiwan University, Taipei, Taiwan.
authors: I-Hui
authors: IH
authors: Wu
authors: Graduate Institute of Clinical Medicine, College of Medicine, National Taiwan University, Taipei, Taiwan Division of Cardiovascular Surgery, Department of Surgery, National Taiwan University Hospital, Yun-Lin Branch, Yun Lin, Taiwan ntuhcvs@gmail.com.
authors: Heng-Wen
authors: HW
authors: Chou
authors: Department of Medical Research, National Taiwan University Hospital, Taipei, Taiwan.
authors: Chin-Hao
authors: CH
authors: Chang
authors: Institute of Epidemiology and Preventive Medicine, College of Public Health, National Taiwan University, Taipei, Taiwan.
authors: Ching-Feng
authors: CF
authors: Lin
authors: Division of Cardiovascular Surgery, Department of Surgery, National Taiwan University Hospital, Taipei, Taiwan Graduate Institute of Clinical Medicine, College of Medicine, National Taiwan University, Taipei, Taiwan.
authors: Nai-Hsin
authors: NH
authors: Chi
authors: Division of Cardiovascular Surgery, Department of Surgery, National Taiwan University Hospital, Taipei, Taiwan.
authors: Shoei-Shen
authors: SS
authors: Wang
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D017544:Aortic Aneurysm, Abdominal / Q000175:diagnosis / Q000503:physiopathology / Q000601:surgery*; D001027:Aortography / Q000379:methods; D019917:Blood Vessel Prosthesis Implantation / Q000009:adverse effects / Q000379:methods*; D017558:Elective Surgical Procedures; D057510:Endovascular Procedures / Q000009:adverse effects / Q000379:methods*; D006801:Humans; D017543:Iliac Aneurysm / Q000175:diagnosis / Q000503:physiopathology / Q000601:surgery*; D008297:Male; D012189:Retrospective Studies; D013624:Taiwan; D013997:Time Factors; D014057:Tomography, X-Ray Computed; D016896:Treatment Outcome; D018616:Ultrasonography, Doppler, Duplex; D014654:Vascular Patency
keywords: abdominal aortic aneurysm; aortoiliac aneurysm; chimney graft; common iliac artery aneurysm; endovascular aneurysm repair; internal iliac artery; self-expanding stent-graft