scholarly journals Dynamic geometry and wall thickness of the aortic neck of abdominal aortic aneurysms with intravascular ultrasonography

2007 ◽  
Vol 46 (5) ◽  
pp. 891-897 ◽  
Author(s):  
Frank R. Arko ◽  
Erin H. Murphy ◽  
Chad M. Davis ◽  
Eric D. Johnson ◽  
Stephen T. Smith ◽  
...  
Keyword(s):  
Wall Thickness ◽  
Dynamic Geometry ◽  
Abdominal Aortic Aneurysms ◽  
Aortic Aneurysms ◽  
Intravascular Ultrasonography ◽  
Aortic Neck ◽  
Abdominal Aortic

scholarly journals EndoAnchors Minimize Endoleaks in Chimney-Graft Endovascular Repair of Juxtarenal Abdominal Aortic Aneurysms

2019 ◽  
Vol 46 (3) ◽  
pp. 183-188 ◽  
Author(s):  
Edgar Luis Galiñanes ◽  
Eduardo A. Hernandez-Vila ◽  
Zvonimir Krajcer
Keyword(s):  
Endovascular Aneurysm Repair ◽  
Abdominal Aortic Aneurysms ◽  
Aortic Aneurysms ◽  
Graft Thrombosis ◽  
Complex Anatomy ◽  
Aortic Neck ◽  
Abdominal Aortic ◽  
Type Ia ◽  
Aneurysm Repair ◽  
Chimney Graft

Juxtarenal abdominal aortic aneurysms (AAAs) are difficult to treat because they often have little or no proximal aortic neck. Patients with this complex anatomy are not usually candidates for an endovascular aneurysm repair (EVAR). Chimney-graft EVAR has been introduced, but type Ia endoleak is a typical risk. We have begun using EndoAnchors to determine whether this risk can be reduced. From July 2013 through July 2014, we used the chimney-graft EVAR technique in 5 patients whose juxtarenal AAAs had a short or no proximal aortic neck. During the procedure, we implanted EndoAnchors as needed. Postprocedurally, at 30 days, and through end of follow-up (duration, 11–18 mo), all patients had patent endografts without type Ia endoleak (our primary endpoint), visceral stent-graft thrombosis, or renal complications. One patient who received 4 chimney grafts had a postprocedural type II endoleak, which was treated with embolization. We found it feasible to use EndoAnchors with the chimney-graft technique to prevent type Ia endoleaks in the treatment of juxtarenal AAAs. Further studies are needed to validate this adjunctive technique and to determine its durability.

Endovascular treatment of complex abdominal aortic aneurysms by combining different types of endoprostheses

Vascular ◽  
2016 ◽  
Vol 24 (4) ◽  
pp. 425-429 ◽  
Author(s):  
Menno T de Bruijn ◽  
Erik Tournoij ◽  
Daniel AF van den Heuvel ◽  
Debbie de Vries-Werson ◽  
Jan Wille ◽  
...  
Keyword(s):  
Large Diameter ◽  
Abdominal Aortic Aneurysms ◽  
Aortic Aneurysms ◽  
Special Focus ◽  
Technical Success ◽  
Aortic Neck ◽  
Abdominal Aortic ◽  
Different Types

Purpose To describe an off-the-shelf method for the treatment of abdominal aortic aneurysms with hostile (large, >30 mm) neck and/or small (<20 mm) aortic bifurcation. Case report We describe five patients with large aortic necks and/or small aortic bifurcations, which were treated by combining an AFX endoprosthesis with a Valiant Captiva endograft, and additional proximal endoanchors when deemed necessary. Initial technical success was 100%. Follow-up ranged from 228 to 875 days. One patient suffered a type 1A and 1B endoleak at 446 days follow-up, which were successfully treated by endovascular means. Conclusion Combining the AFX and Valiant Captiva endografts is an off-the-shelf solution for treatment of large diameter aortic necks and small aortic bifurcations in patients deemed unfit for open repair or declined for fenestrated endografts. Longer follow-up is required to assess the long-term safety with special focus on aortic neck dilation.

scholarly journals Patient-specific modelling of abdominal aortic aneurysms: The influence of wall thickness on predicted clinical outcomes

2016 ◽  
Vol 38 (6) ◽  
pp. 526-537 ◽  
Author(s):  
Noel Conlisk ◽  
Arjan J. Geers ◽  
Olivia M.B. McBride ◽  
David E. Newby ◽  
Peter R. Hoskins
Keyword(s):  
Clinical Outcomes ◽  
Wall Thickness ◽  
Abdominal Aortic Aneurysms ◽  
Aortic Aneurysms ◽  
Patient Specific ◽  
Abdominal Aortic

scholarly journals A Comparative Study on the Hemodynamic Performance Within Cross and Non-cross Stent-Grafts for Abdominal Aortic Aneurysms With an Angulated Neck

2021 ◽  
Vol 12 ◽  
Author(s):  
Ming Qing ◽  
Yue Qiu ◽  
Jiarong Wang ◽  
Tinghui Zheng ◽  
Ding Yuan
Keyword(s):  
Endovascular Aneurysm Repair ◽  
Abdominal Aortic Aneurysms ◽  
Aortic Aneurysms ◽  
Maximum Difference ◽  
Stent Grafts ◽  
Aneurysm Neck ◽  
Angular Direction ◽  
Aortic Neck ◽  
Abdominal Aortic ◽  
The Difference

Objectives: Cross-limb stent grafts for endovascular aneurysm repair (EVAR) are often employed for abdominal aortic aneurysms (AAAs) with significant aortic neck angulation. Neck angulation may be coronal or sagittal; however, previous hemodynamic studies of cross-limb EVAR stent grafts (SGs) primarily utilized simplified planar neck geometries. This study examined the differences in flow patterns and hemodynamic parameters between crossed and non-crossed limb SGs at different spatial neck angulations.Methods: Ideal models consisting of 13 cross and 13 non-cross limbs were established, with coronal and sagittal angles ranging from 0 to 90°. Computational fluid dynamics (CFD) was used to capture the hemodynamic information, and the differences were compared.Results: With regards to the pressure drop index, the maximum difference caused by the configuration and angular direction was 4.6 and 8.0%, respectively, but the difference resulting from the change in aneurysm neck angle can reach 27.1%. With regards to the SAR-TAWSS index, the maximum difference caused by the configuration and angular direction was 7.8 and 9.8%, respectively, but the difference resulting from the change in aneurysm neck angle can reach 26.7%. In addition, when the aneurysm neck angle is lower than 45°, the configuration and angular direction significantly influence the OSI and helical flow intensity index. However, when the aneurysm neck angle is greater than 45°, the hemodynamic differences of each model at the same aneurysm neck angle are reduced.Conclusion: The main factor affecting the hemodynamic index was the angle of the aneurysm neck, while the configuration and angular direction had little effect on the hemodynamics. Furthermore, when the aneurysm neck was greatly angulated, the cross-limb technique did not increase the risk of thrombosis.

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