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Table 1 Grading of severity of arterial stenosis [6]

From: What is the impact of infrapopliteal endovascular intervention on free flap survival in diabetic foot reconstruction?

Grade Criteria
0 Normal patency
1 Mild (stenosis of less than 25% of diameter)
2 Moderate (stenosis of 25–50% of diameter)
3 Moderate severe (stenosis of 50–75% of diameter)
4 Severe (stenosis of 75–99% of diameter)
5 Complete occlusion