Peak Systolic Velocity(PSV) Velocity Ratio (Vr)
Normal <180 cm/s <2.0
Moderate stenosis 180-300 cm/s >2.0
High grade stenosis* PSV >300 cm/s >3.5
Impending graft failure* PSV <45 cm/s NA
Occlusion No flow signal or color saturation identifiable
  • A decrease in ABI >0.15 supports the presence of significant disease progression.

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