Porcine model of infrarenal abdominal aortic aneurysm

Research output: Contribution to journalArticle

Authors

  • Alexander H. Shannon
  • J. Michael Cullen
  • Jolian J. Dahl
  • Erik J. Scott
  • Zachary Tyerman
  • Michael D. Spinosa
  • William G. Montgomery
  • W. Forrest Johnston
  • Guanyi Lu
  • Morgan Salmon
  • Gorav Ailawadi
  • Gilbert R. Upchurch

External Institution(s)

  • University of Virginia
  • Ochsner Medical Center
  • University of Florida

Details

Original languageEnglish (US)
Article numbere60169
JournalJournal of Visualized Experiments
Volume2019
Issue number153
StatusPublished - Nov 2019
Peer-reviewedYes

Abstract

Large animal models to study abdominal aortic aneurysms are sparse. The purpose of this model is to create reproducible, clinically significant infrarenal abdominal aortic aneurysms (AAA) in swine. To achieve this, we use a combination of balloon angioplasty, elastase and collagenase, and a lysyl oxidase inhibitor, called β-aminopropionitrile (BAPN), to create clinically significant infrarenal aortic aneurysms, analogous to human disease. Noncastrated male swine are fed BAPN for 7 days prior to surgery to achieve a steady state in the blood. A midline laparotomy is performed and the infrarenal aorta is circumferentially dissected. An initial measurement is recorded prior to aneurysm induction with a combination of balloon angioplasty, elastase (500 units)/collagenase (8000 units) perfusion, and topical elastase application. Swine are fed BAPN daily until terminal procedure on either postoperative day 7, 14, or 28, at which time the aneurysm is measured, and tissue procured. BAPN + surgery pigs are compared to pigs that underwent surgery alone. Swine treated with BAPN and surgery had a mean aortic dilation of 89.9% ± 47.4% at day 7, 105.4% ± 58.1% at day 14, and 113.5% ± 30.2% at day 28. Pigs treated with surgery alone had significantly smaller aneurysms compared to BAPN + surgery animals at day 28 (p < 0.0003). The BAPN + surgery group had macroscopic and immunohistochemical evidence of end stage aneurysmal disease. Clinically significant infrarenal AAA can be induced using balloon angioplasty, elastase/collagenase perfusion and topical application, supplemented with oral BAPN. This model creates large, clinically significant AAA with hallmarks of human disease. This has important implications for the elucidation of AAA pathogenesis and testing of novel therapies and devices for the treatment of AAA. Limitations of the model include variation in BAPN ingested by swine, quality of elastase perfusion, and cost of BAPN.

    Research areas

  • Aortic aneurysms, Cardiovascular disease, Cytokines, Immunohistochemistry, Inflammation, Issue 153, Macrophages, Medicine

Citation formats

APA

Shannon, A. H., Cullen, J. M., Dahl, J. J., Scott, E. J., Tyerman, Z., Spinosa, M. D., ... Upchurch, G. R. (2019). Porcine model of infrarenal abdominal aortic aneurysm. Journal of Visualized Experiments, 2019(153), [e60169]. https://doi.org/10.3791/60169

Harvard

Shannon, AH, Cullen, JM, Dahl, JJ, Scott, EJ, Tyerman, Z, Spinosa, MD, Montgomery, WG, Johnston, WF, Lu, G, Salmon, M, Ailawadi, G & Upchurch, GR 2019, 'Porcine model of infrarenal abdominal aortic aneurysm', Journal of Visualized Experiments, vol. 2019, no. 153, e60169. https://doi.org/10.3791/60169