title: Influencing Factors for Abdominal Aortic Aneurysm Sac Shrinkage and Enlargement after EVAR: Clinical Reviews before Introduction of Preoperative Coil Embolization.
abstract: BACKGROUND
  We previously reported effectiveness of coil embolization (CE) to aortic branched vessels before endovascular aortic repair (EVAR) for abdominal aortic aneurysm (AAA) because of significant shrinkage of aneurysmal sac. In this study, we investigated EVAR cases to clarify influential factors of aneurysmal shrinkage and enlargement.
  
  
  METHODS
  148 consecutive cases before the introduction of CE were retrospectively reviewed based on the presence of PT2EL (persistent type 2 endoleak) and change in sac diameter after EVAR by multivariate analysis.
  
  
  RESULTS
  (A) PT2EL risk factors were patent inferior mesenteric artery (IMA) and thinner mural thrombus inside aneurysmal sac. (B) Sac enlargement risk factors were antiplatelet intake, PT2EL, and female gender. (C) Sac shrinkage predictive factors were the absences of thoracic aortic aneurysm, antiplatelet intake, PT2EL, and coronary artery disease.
  
  
  CONCLUSIONS
  CE to IMA was considered to be effective because patent IMA and antiplatelet intake were significant risk factors for sac enlargement. So, more meticulous therapeutic strategy, including treatment priority (AAA first or CAD first) and choice of treatment (EVAR vs. AAA) based on anatomical features of AAA was required to improve late outcomes.
authors.affiliation: Department of Cardiovascular Surgery, The Sakakibara Heart Institute of Okayama, Okayama, Okayama, Japan.
authors.forename: Genta
authors.initials: G
authors.lastname: Chikazawa
authors.affiliation: Department of Cardiovascular Surgery, The Sakakibara Heart Institute of Okayama, Okayama, Okayama, Japan.
authors.forename: Arudo
authors.initials: A
authors.lastname: Hiraoka
authors.affiliation: Department of Cardiovascular Surgery, The Sakakibara Heart Institute of Okayama, Okayama, Okayama, Japan.
authors.forename: Toshinori
authors.initials: T
authors.lastname: Totsugawa
authors.affiliation: Department of Cardiovascular Surgery, The Sakakibara Heart Institute of Okayama, Okayama, Okayama, Japan.
authors.forename: Kentaro
authors.initials: K
authors.lastname: Tamura
authors.affiliation: Department of Cardiovascular Surgery, The Sakakibara Heart Institute of Okayama, Okayama, Okayama, Japan.
authors.forename: Atsuhisa
authors.initials: A
authors.lastname: Ishida
authors.affiliation: Department of Cardiovascular Surgery, The Sakakibara Heart Institute of Okayama, Okayama, Okayama, Japan.
authors.forename: Taichi
authors.initials: T
authors.lastname: Sakaguchi
authors.affiliation: Department of Cardiovascular Surgery, The Sakakibara Heart Institute of Okayama, Okayama, Okayama, Japan.
authors.forename: Hidenori
authors.initials: H
authors.lastname: Yoshitaka
keywords: EVAR; coil embolization; endoleak; sac enlargement and shrinkage