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Early development of suture holding capacity in vascular anastomoses in the rat
B T Sigurbjörnsson1, P Löwenhielm, B A Agnarsson
1Department of Surgery, University of Lund, Sweden.
Insights
The suture holding capacity of the aorta shows impaired healing after anastomosis, unlike the inferior vena cava (IVC) which recovers quickly. Aortic wall changes may increase risks of pseudoaneurysms.
Area of Science:
- Vascular surgery
- Biomedical engineering
- Regenerative medicine
Background:
- Suture holding capacity (SHC) is crucial for vascular anastomosis healing.
- Understanding early healing differences between arteries and veins is vital for surgical outcomes.
Purpose of the Study:
- To investigate the early development of SHC in rat infrarenal aorta and inferior vena cava (IVC) end-to-end anastomoses.
- To compare the healing and biomechanical properties of arterial versus venous anastomoses.
Main Methods:
- Tensile strength testing of anastomoses at multiple postoperative time points (0-14 days).
- Histological evaluation of comparable anastomoses.
- Measurement of relative ultimate strain and compliance in perianastomotic walls.
Main Results:
- Aortic SHC decreased post-anastomosis and did not reach non-anastomosed strength within two weeks.
- IVC SHC decreased but recovered to baseline levels by day 5.
- Arterial anastomoses showed perianastomotic media necrosis, unlike venous ones.
Conclusions:
- Rat aortic anastomoses exhibit impaired early healing compared to IVC anastomoses.
- Altered biomechanical properties of the aortic wall post-anastomosis may predispose to complications like pseudoaneurysms.
Abstract:
Early development of suture holding capacity (SHC) of end-to-end anastomoses in the infrarenal aorta and inferior vena cava (IVC) of the rat was studied by measuring the resistance to tensile forces at 0, 3, 5, 8, 11, or 14 days postoperatively. Comparable anastomoses were histologically evaluated. The SHC of the aortic wall decreased following anastomoses and did not regain the strength of nonanastomosed vessels during the first two weeks. The SHC of the IVC also decreased following anastomoses, but regained the strength of nonanastomosed vessels by the 5th day. The relative ultimate strain of the arterial and venous perianastomotic walls decreased slightly, while the relative compliance increased in the aorta and decreased in the IVC. Perianastomotic media necrosis was found exclusively in the arteries. The reduced perianastomotic SHC in the aorta indicates impaired healing, compared to the IVC. Changes in biomechanical properties of the aortic wall following anastomosis may increase its susceptibility to anastomotic complications such as pseudoaneurysms.