Duplex criteria for determination of in-stent stenosis after angioplasty and stenting of the superficial femoral artery

A, Duplex ultrasound results demonstrate elevated velocity of 295 cm/s in the middle portion of a superficial femoral artery stent. B, Arteriogram demonstrates a superficial femoral artery midstent 70% stenosis.

Scatter plots of the (A) peak systolic velocities (PSV), (B) in-stent PSV to proximal superficial femoral artery (SFA) PSV ratio, and (C) decrease in ankle-brachial index (ABI) correlate with angiographic stenosis in stented SFAs.

Receiver operator characteristic (ROC) curves differentiate between ≥50% and <50% stenosis in stented arteries by (A) peak systolic velocity (PSV) and (B) velocity ratio. Differentiation between ≥80% and <80% stenosis in stented arteries is shown by (C) PSV and (D) velocity ratio.