Clotted temporary catheters are injected with a fibrinolytic agent or are replaced.6 Clotting is a more common problem with grafts than with fistulas. It's important to examine the fistula or graft to determine adequate blood flow. Good blood flow is turbulent. The access site and peripheral pulses should be checked frequently. If the bruit or thrill has disappeared or a change is noted, the surgeon should be notified.