Table 1.

Definition of complications in the SRR

Complication category	Complication registered in SRR	Definition of complication in SRR
Bleeding	Bleeding	Is registered if it leads to blood transfusion. Reoperation, hospitalization, or prolonged hospitalization
Thrombosis/occlusion	Thrombosis/occlusion	That leads to intervention or AVF abandonment
Stenosis	Stenosis vein Stenosis artery Stenosis vein + vein branches Stenosis artery + vein	Is registered if it leads to angioplasty or if the velocity is 2.5-times increased measured with duplex ultrasound or > 50% reduction in the diameter measured with venography
Infection	Infection Infection - local Infection - general	Local or general infection originating in the AVF and needs treatment with antibiotics
Other	Stenosis central vein Stenosis central vein + other stenosis	The stenosis is called central from the beginning of the vena cephalica in the vena subclavia or proximal of this point; stenosis in central vein registered even though it doesn’t lead to an intervention
	Steal syndrome Vein branches Other	That leads to intervention or AVF abandonment
	Low flow High flow	That leads to intervention or AVF abandonment
Aneurysm	Pseudoaneurysm Aneurysm	That leads to intervention or AVF abandonment
Cannulation difficulty	Cannulation difficulty	That leads to intervention or AVF abandonment
Infiltration	Infiltration	That leads to intervention or AVF abandonment