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Effects of metal coverage rate of flow diversion device on neointimal growth at side branch ostium and stented artery: an animal experiment in rabbit abdominal aorta

  • Interventional Neuroradiology
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Abstract

Introduction

To access the effect of actual metal coverage rate (MCR) on neointimal growth at covered side branch ostium and stented artery after implantation of a flow diversion device.

Methods

Flow diverters (FDs) were implanted into abdominal aortas of 20 New Zealand rabbits. Four weeks and three months after FD implantation, the patency of side branches covered by the devices was assessed by angiography. The animals were sacrificed after angiography at 3 months postsurgery. The local actual MCR was measured under microscope and calculated. The extent of neointimal coverage at the ostia of branches and the neointima within the stent were examined by histology and scanning electron microscopy.

Results

No side branch occlusion was noted, either immediately after implantation or at follow-ups. At 3 months after implantation, the intimal coverage of branch ostia caused by a 30–40% MCR was not significantly different from that caused by an MCR ≤ 30% (p = 0.792), but it was significantly lower than that caused by an MCR ≥ 40% (p = 0.021). Neointimal thickness in the stented abdominal aorta was positively correlated to MCR (r = 0.523, p = 0.001). The neointima was composed predominantly of smooth muscle cells and collagen fibers.

Conclusion

The actual MCR exhibited remarkable differences once FD was implanted in vivo. Significantly more intimal coverage at the side branch ostia could be induced when MCR was ≥40%. The neointimal thickness within the stent was positively correlated to device MCR.

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Acknowledgments

This work was supported by the National Natural Science Foundation of China (30973102, 30901556) and Rising-Star Program of Shanghai Science and Technology Committee (grant no. 11QA1408400). We gratefully thank MicroPort Medical (Shanghai) for the free flow-diverting stents.

Conflict of interest

We declare that we have no conflict of interest.

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Authors and Affiliations

  1. Department of Neurosurgery, Changhai Hospital, Second Military Medical University, 168 Changhai Road, Shanghai, 200433, China

    Bo Hong, Qinghai Huang, Yi Xu, Xinggen Fang, Zhen Li & Jianmin Liu

  2. Department of Neurosurgery, General Hospital of Ji’nan Military Region, Ji’nan, 250031, China

    Kuizhong Wang

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  1. Bo Hong
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  2. Kuizhong Wang
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  3. Qinghai Huang
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  4. Yi Xu
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  6. Zhen Li
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  7. Jianmin Liu
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Correspondence to Jianmin Liu.

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Dr. Kuizhong Wang and Bo Hong are co-first authors.

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Hong, B., Wang, K., Huang, Q. et al. Effects of metal coverage rate of flow diversion device on neointimal growth at side branch ostium and stented artery: an animal experiment in rabbit abdominal aorta. Neuroradiology 54, 849–855 (2012). https://doi.org/10.1007/s00234-011-0984-6

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  • DOI: https://doi.org/10.1007/s00234-011-0984-6

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