Prevention of p.o. clotting of av. cimino fistulae with Acetylsalicyl acid results of a prospective double blind study

In a prospective double blind study prophylactic administration of Acetylsalicylic acid (ASA) in low doses decreased significantly the rate of fistula clotting in the immediately p.o. period in uremic patients. The risk of fistula clotting was related to poor arterial blood flow, female sex and number of unsuccessful previous fistula operations. The incidence of side effects (g.i. and non g.i. bleeding) was acceptable with low doses of ASA and prophylactic administration of antacids.