Magnetic Anastomosis Rings to Create Portacaval Shunt in a Canine Model of Portal Hypertension
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This study evaluated a novel magnetic compression technique (magnamosis) for creating a portacaval shunt in a canine model of portal hypertension, relative to traditional manual suture.
Portal hypertension was induced in 18 dogs by partial ligation of the portal vein (baseline). Six weeks later, extrahepatic portacaval shunt implantation was performed with either magnetic anastomosis rings, or traditional manual suture (n = 9, each). The two groups were compared for operative time, portal vein pressure, and serum biochemical indices. Twenty-four weeks post-implantation, the established anastomoses were evaluated by color Doppler imaging, venography, and gross and microscopic histological examinations.
Anastomotic leakage did not occur in either group. The operative time to complete the anastomosis for magnamosis (4.12 ± 1.04 min) was significantly less than that needed for manual suture (24.47 ± 4.89 min, P < 0.01). The portal vein pressure in the magnamosis group was more stable than that in the manual suture group. The blood ammonia level at the end of the 24-week post-implantation observation period was significantly lower in the magnamosis group than in the manual suture group. Gross and microscopic histological examinations revealed that better smoothness and continuity of the vascular intima had been achieved via magnamosis than with manual suture.
Magnamosis was superior to manual suture for the creation of a portacaval shunt in this canine model of portal hypertension.
KeywordsMagnetic compression technique Magnamosis Portacaval shunt Portal hypertension Canine model
Conception and design: Yi Lv, Xiao-Peng Yan
Performed the research and acquired the data: Hao-Hua Wang, Jia Ma, Shan-Pei Wang, Feng Ma, Jian-Wen Lu, Xiang-Hua Xu, Xiao-Peng Yan
Analyzed the data: Jian-Wen Lu, Xiang-Hua Xu, Xiao-Peng Yan
Manuscript writing: Hao-Hua Wang, Jia Ma, Yi Lv, Xiao-Peng Yan
Final approval of manuscript: All authors
This work was supported by the National Natural Science of Foundation of China (81700545 and 81470896) and Natural Science Basic Research Plan in Shaanxi Province of China (2017JQ8021). The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.
Compliance with Ethical Standards
The Committee on the Ethics of Animal Experiments of Xi’an Jiaotong University (permit number 2010-105) approved the study protocol.
Conflict of Interest
The authors declare that they have no conflict of interests.
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