Stent graft surface movement after infrarenal abdominal aortic aneurysm repair: comparison of patients with and without a type 2 endoleak

R Nolz; E Schwartz; G Langs; C Loewe; A G Wibmer; A M Prusa; H Teufelsbauer; M Schoder

doi:10.1016/j.ejvs.2015.03.031

Stent graft surface movement after infrarenal abdominal aortic aneurysm repair: comparison of patients with and without a type 2 endoleak

Eur J Vasc Endovasc Surg. 2015 Aug;50(2):181-8. doi: 10.1016/j.ejvs.2015.03.031. Epub 2015 Apr 25.

Authors

R Nolz¹, E Schwartz², G Langs², C Loewe³, A G Wibmer³, A M Prusa⁴, H Teufelsbauer⁴, M Schoder³

Affiliations

¹ Department of Biomedical Imaging and Image-guided Therapy, Division of Cardiovascular and Interventional Radiology, Medical University of Vienna, Vienna, Austria. Electronic address: [email protected].
² Department of Biomedical Imaging and Image-guided Therapy, Computational and Imaging Research Laboratory, Medical University of Vienna, Vienna, Austria.
³ Department of Biomedical Imaging and Image-guided Therapy, Division of Cardiovascular and Interventional Radiology, Medical University of Vienna, Vienna, Austria.
⁴ Department of Surgery, Division of Vascular Surgery, Medical University of Vienna, Vienna, Austria.

PMID: 25920628
DOI: 10.1016/j.ejvs.2015.03.031

Abstract

Objectives: The aim was to compare multidirectional stent graft movement in patients with and without a type 2 endoleak.

Methods: This was a retrospective case control study of patients being followed up after elective endovascular aneurysm repair of abdominal aortic aneurysms. The post-procedural and final follow up multislice computed tomography (MSCT) of 69 patients with and 74 without a type 2 endoleak were analyzed. Three dimensional (3D) surface models of the stent graft, delimited by landmarks using custom built software, were derived from these MSCT data. The stent graft was segmented in different zones, and the proportion of the total stent graft surface moving >9 mm between the post-procedural and the final follow up MSCT was calculated, given in percentages, and compared between groups. Changes of infrarenal neck, renal artery to stent graft distance, and freedom from stent graft related endoleaks were evaluated.

Results: Overall surface movement was higher in the no endoleak (18.8%, IQR 0.1-45.1%) than in the type 2 endoleak group (5.3%, IQR 0-29.7%; p = .06). Furthermore, significantly higher surface movement in the no endoleak group was found in the proximal anchoring zone (p = .04) and the distal left limb (p = .01), which was the modular limb in 81.1% (p < .01). Neck diameter increase (1.0 mm, IQR 0-3.0 mm; p < .01) and renal artery to stent graft distance difference (0 mm, IQR 0-3.3 mm; p < .01) were significantly higher in the no endoleak group. Five patients in the no endoleak and one patient in the type 2 endoleak group suffered from a stent graft related endoleak (p = .27).

Conclusions: The presence of a type 2 endoleak is associated with decreased surface movement of the proximal anchoring zone and the distal modular limb of bifurcated stent grafts.

Keywords: Abdominal; Aortic aneurysm; Endoleak; Migration; Movement; Stent graft.

Publication types

Comparative Study

MeSH terms

Aged
Aged, 80 and over
Aortic Aneurysm, Abdominal / diagnosis
Aortic Aneurysm, Abdominal / surgery*
Aortography / methods
Blood Vessel Prosthesis Implantation / adverse effects*
Blood Vessel Prosthesis Implantation / instrumentation*
Blood Vessel Prosthesis*
Endoleak / diagnosis
Endoleak / etiology*
Endovascular Procedures / adverse effects*
Endovascular Procedures / instrumentation*
Female
Foreign-Body Migration / diagnosis
Foreign-Body Migration / etiology
Humans
Imaging, Three-Dimensional
Male
Multidetector Computed Tomography
Predictive Value of Tests
Radiographic Image Interpretation, Computer-Assisted
Retrospective Studies
Risk Factors
Stents*
Treatment Outcome