Stent graft Surface Movement after Infrarenal Abdominal Aortic Aneurysm Repair: Comparison of Patients with and without a Type 2 Endoleak

• Published in: European journal of vascular and endovascular surgery Vol. 50; no. 2; pp. 181 - 188
• Main Authors: Nolz, R, Schwartz, E, Langs, G, Loewe, C, Wibmer, A.G, Prusa, A.M, Teufelsbauer, H, Schoder, M
• Format: Journal Article
• Language: English
• Published: England Elsevier Ltd 01.08.2015
• Subjects: Abdominal; Aged; Aged, 80 and over; Aortic aneurysm; Aortic Aneurysm, Abdominal - diagnosis; Aortic Aneurysm, Abdominal - surgery; Aortography - methods; Blood Vessel Prosthesis; Blood Vessel Prosthesis Implantation - adverse effects; Blood Vessel Prosthesis Implantation - instrumentation; Endoleak; 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; Migration; Movement; Multidetector Computed Tomography; Predictive Value of Tests; Radiographic Image Interpretation, Computer-Assisted; Retrospective Studies; Risk Factors; Stent graft; Stents; Surgery; Treatment Outcome; Stent graft; Movement; Abdominal; Aortic aneurysm; Endoleak; Migration
• ISSN: 1078-5884; 1532-2165
• DOI: 10.1016/j.ejvs.2015.03.031

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.