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[Progressive complications associated with the use of a bovine heterograft for vascular access]
Insights
Bovine carotid heterografts used for vascular access showed limitations, with aneurysms and thrombosis developing in patients. These degenerative changes highlight material constraints in angioaccess therapy.
Area of Science:
- Vascular Surgery
- Biomaterials Science
- Nephrology
Background:
- Bovine carotid heterografts are utilized for creating arteriovenous fistulas to facilitate vascular access in patients requiring long-term hemodialysis or plasmapheresis.
- Understanding the long-term durability and potential complications of these grafts is crucial for optimizing patient outcomes in angioaccess therapy.
Observation:
- Three cases involving bovine carotid heterografts are presented, with complications arising after implantation for vascular access.
- One graft, used for plasmapheresis, developed significant dilation and required resection after 14 months.
- Another graft, for chronic potassium insufficiency, thrombosed and was removed after 16 months.
- A third graft, for hemodialysis, showed aneurysmal dilatation near the anastomosis and was removed after 3.5 months.
Findings:
- The study observed degenerative changes, including aneurysmal dilatation and thrombosis, in bovine carotid heterografts used for vascular access.
- These complications occurred at varying intervals post-implantation, ranging from 3.5 to 16 months.
- Microstructural weaknesses in the graft material prior to implantation were also noted as a potential contributing factor.
Implications:
- The findings suggest that bovine carotid heterografts have limitations as interpositional grafts for arteriovenous fistulas due to their propensity for degenerative changes.
- These limitations may impact their long-term efficacy and safety in angioaccess therapy.
- Further research into alternative biomaterials or graft modifications may be warranted to improve durability and reduce complication rates.
Abstract:
Three bovine carotid heterografts, used for vascular access, were analysed after removal following the development of aneurysms in two cases and thrombosis in one. The first prosthesis was implanted in a 17-year-old man who suffered from myasthenia gravis and was undergoing plasmapheresis. It became notably dilated several months after implantation, and resection was necessary 14 months after insertion. The second graft was placed in a 31-year-old woman being treated for a severe chronic potassium insufficiency. It was removed 16 months after insertion because of thrombosis. The third bovine carotid heterograft was inserted in a 48-year-old patient on long-term hemodialysis and was removed 3.5 months later because of aneurysmal dilatation adjacent to the arterial anastomosis. These evolutionary and degenerative changes associated with the bovine carotid heterograft illustrate the limitations of this material as an interpositional limb for arteriovenous fistulas in angioaccess therapy. Small weaknesses have sometimes been noted in the microstructure of the graft material studied before implantation.