Table 1.

Peripheral artery stent thrombosis: Defining criteria

Category	Definition
Based on event certainty:
Definite stent thrombosis	Confirmation of a thrombotic occlusion of the lower extremity peripheral artery involving the stented segment (±5 mm proximal and distal to a stent edge) during peripheral angiography, surgical exploration or autopsy in patients presenting with an acute onset of lower limb pain
Probable stent thrombosis	Acute symptomatic occlusion involving the stented arterial segment was diagnosed by duplex ultrasonography, computed tomographic angiography, magnetic resonance imaging or angiography, in the absence of angiographic, surgical or an autopsy confirmation
Possible stent thrombosis	Diagnosis of thrombus of a lower extremity peripheral artery with prior stent placement by any imaging modality, surgical exploration or autopsy, however not involving the stented segment
Based on event timing:
Early stent thrombosis	≤30 days
Acute stent thrombosis	≤48 hours
Sub-acute stent thrombosis	>48 hours, but ≤30 days
Late stent thrombosis	≥31 days to 1 year
Very late stent thrombosis	>1 year