The best way to check the patency of arteriovenous fistula for haemodialysis?
1
Pinch the fistula and note the speed of filling on release
2
Use a needle and syringe to aspirate the blood from the fistula
3
To check for the capillary refill of the nail beds on that extremity
4
Palpate the fistula throughout its length to assess for a thrill