Depends if patient is symptomatic
AV Fistula: indications for vascular evaluation 
The skin overlying the fistula is compromised
There is a risk of fistula rupture
Available puncture sites are limited
The skin overlying the fistula is compromised
There is a risk of fistula rupture
Available puncture sites are limited
AV Graft: indications for vascular evaluation<unk>  that is symptomatic<unk>  that is twice the diameter of the graft (ie, >4 cm in diameter)<unk>  that threatens the viability of the overlying skin, regardless of diameter<unk>  that is expanding
Large or multiple<unk> s that limit the number of cannulation sites.<unk>  that is symptomatic<unk>  that is twice the diameter of the graft (ie, >4 cm in diameter)<unk>  that threatens the viability of the overlying skin, regardless of diameter<unk>  that is expanding
Large or multiple<unk> s that limit the number of cannulation sites.
AV fistula aneurysm/pseudoaneurysm
Clotting of AV fistula
High-output heart failure from AV fistula
Infection of AV fistula
Hemorrhage of AV fistula
Vascular insufficiency from AV fistula
Acute arterial ischemia
Aortic endograft complications