Arterial Pouch Microsurgical Bifurcation Aneurysm Model in the Rabbit.

Wanderer, Stefan; Waltenspuel, Claudia; Grüter, Basil E; Strange, Fabio; Sivanrupan, Sivani; Remonda, Luca; Widmer, Hans Rudolf; Casoni, Daniela; Andereggen, Lukas; Fandino, Javier; Marbacher, Serge (2020). Arterial Pouch Microsurgical Bifurcation Aneurysm Model in the Rabbit. Journal of visualized experiments(159) MYJoVE Corporation 10.3791/61157

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Endovascular treatment for intracranial aneurysms gained importance over the past decades, consequently there is an increased need of testing endovascular devices. Animal models respecting rheological, hemodynamic and aneurysm wall conditions are highly warranted. Therefore, the aim of the present study was to design a novel standardized and reproducible surgical technique to create autologous arterial pouch bifurcation aneurysms with non-modified and modified wall conditions in rabbits. Bifurcation aneurysms were created by end-to-side anastomosis of the right on the left common carotid artery, both serving as parent arteries for the arterial pouch, which was microsurgically sewn on. Grafts were taken from the proximal right common carotid artery, either for the control (n = 7, immediate autologous re-implantation) or modified (n = 7, incubated with 100 international units elastase for 20 minutes before autologous re-implantation) group. Pouch and parent artery patency were controlled by fluorescence angiography immediately after creation. At follow-up (28 days), all rabbits underwent contrast enhanced magnetic resonance angiography and fluorescence angiography followed by aneurysm harvesting, macroscopic and histological evaluation. A total of 16 female New Zealand White rabbits were operated upon. Two animals died prematurely. At follow-up, 85.72% of all aneurysms remained patent. Both groups revealed an increase in aneurysm size over time; this was more pronounced in the control group (6.48 ± 1.81 mm3 at time of creation vs. 19.85 ± 6.40 mm3 at follow-up, p = 0.037) than in the modified group (8.03 ± 1.08 mm3 at time of creation vs. 20.29 ± 6.16 mm3 at follow-up, p = 0.054). Our findings demonstrate the adequacy of this new rabbit model which allows for the creation of bifurcation aneurysms with different wall conditions in a microsurgical approach. Given the excellent long-term patency and the property of aneurysm growth over time, this model may serve as an important tool for preclinical evaluation of novel endovascular therapies.

Item Type:

Journal Article (Further Contribution)

Division/Institute:

04 Faculty of Medicine > Pre-clinic Human Medicine > BioMedical Research (DBMR)
04 Faculty of Medicine > Department of Head Organs and Neurology (DKNS) > Clinic of Neurosurgery

UniBE Contributor:

Widmer, Hans Rudolf and Casoni, Daniela

Subjects:

600 Technology > 610 Medicine & health

ISSN:

1940-087X

Publisher:

MYJoVE Corporation

Language:

English

Submitter:

Nicole Söll

Date Deposited:

07 Jul 2020 15:34

Last Modified:

07 Jul 2020 15:34

Publisher DOI:

10.3791/61157

PubMed ID:

32478731

URI:

https://boris.unibe.ch/id/eprint/145029

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