What precautions need to be taken to ensure the successful maturation and long-term functionality of an endovascular arteriovenous fistula?  

A broad topic - I'll attempt to hit the main points. Considering many fistulas do not mature (forearm fistula > upper arm) - Successful maturation starts with vein preservation (avoiding PICC lines, IV lines, and marking the chosen limb with a bracelet); choosing an appropriate artery (non-calci...