It is important to maintain good function of arteriovenous grafts (A-V graft) in patients on hemodialysis.Obstruction of an arteriovenous graft is life-threatening and increases medical costs.

• 摘要对于血液透析治疗的病人而言，一条功能良好的人工血管无疑是最重要生命线，人工血管发生阻塞不但危急生命更增加医疗成本负担。