[Open construction of experimental abdominal aortic aneurysm swine models with Dacron patch for evaluating endovascular aneurysm repair techniques].

OBJECTIVE: To construct an experimental abdominal aortic aneurysm (AAA) swine model with Dacron patch for evaluating endovascular aneurysm repair (EVAR) technique. METHODS: The experimental pigs were generally anesthetized for the open procedure of an aneurysm model creation with Dacron and subsequent arteriography and EVAR with stent graft. Repeat arteriography was performed after 3-month follow-up. RESULTS: AAA models were successfully constructed in all 10 experimental pigs. The average aneurysm diameter was (26.3±3.1)mm, increasing by (15.7±3.1)mm comparing to the primary aorta diameter (10.5±0.4)mm. The aorta diameter before and after the experiment showed significant difference (P<0.001). All the animals were survived after the procedure. One swine died 24 hours after the subsequent EVAR because the covering of both renal arteries by the stent graft. The rest 9 animals survived well after the whole operation and 3-month follow-up. The surviving rates at 1 month and 3 months after the operation were both 90%. One type 2 endoleak (10%) was observed after the EVAR, which disappeared at 3-month follow-up. CONCLUSIONS: Open construction of experimental AAA swine models with Dacron patch is safe and feasible. The model can be used in the developing new EVAR techniques and implant training.