The in vivo performance of small-caliber nanofibrous polyurethane vascular grafts

BMC Cardiovascular Disorders

Shen-ming Wang¹  Yuan-sen Qin¹  Rui-ming Liu¹  Wei He²  Ling-yu Hu²  Zi-lun Li¹  Zuo-jun Hu¹ 

[1] Department of Vascular Surgery, The First Affiliated Hospital of Sun Yat-Sen University, No. 58 Zhongshan 2nd Road, Guangzhou, 510080, China;Guangzhou Women and Children’s Medical Center, Guangzhou, 510080, China

关键词: Animal study;    Small-caliber vascular grafts;    Polyurethane;    Nanofibers;   

Others  :  857958
DOI  :  10.1186/1471-2261-12-115

 received in 2012-09-14, accepted in 2012-11-28,  发布年份 2012

【 摘 要 】

Background

In a previous in vitro study, we confirmed that small-caliber nanofibrous polyurethane (PU) vascular grafts have favorable mechanical properties and biocompatibility. In the present study, we examined the in vivo biocompatibility and stability of these grafts.

Methods

Forty-eight adult male beagle dogs were randomly divided into two groups receiving, respectively, polyurethane (PU) or polytetrafluoroethylene (PTFE) grafts (n = 24 animals / group). Each group was studied at 4, 8, 12, and 24 weeks after graft implantation. Blood flow was analyzed by color Doppler ultrasound and computed tomography angiography. Patency rates were judged by animal survival rates. Coverage with endothelial and smooth muscle cells was characterized by hematoxylin-eosin and immunohistological staining, and scanning electron microscopy (SEM).

Results

Patency rates were significantly higher in the PU group (p = 0.02 vs. PTFE group). During the first 8 weeks, endothelial cells gradually formed a continuous layer on the internal surface of PU grafts, whereas coverage of PTFE graft by endothelial cells was inhomogeneous. After 12 weeks, neointimal thickness remained constant in the PU group, while PTFE group showed neointimal hyperplasia. At 24 weeks, some anastomotic sites of PTFE grafts became stenotic (p = 0.013 vs. PU group). Immunohistological staining revealed a continuous coverage by endothelial cells and an orderly arrangement of smooth muscle cells on PU grafts. Further, SEM showed smooth internal surfaces in PU grafts without thrombus or obvious neointimal hyperplasia.

Conclusions

Small-caliber nanofibrous PU vascular grafts facilitate the endothelialization process, prevent excessive neointimal hyperplasia, and improve patency rates.

【 授权许可】

   
2012 Hu et al.; licensee BioMed Central Ltd.

【 图 表 】

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