<60% stenosis PSV  of 57 - 280 cm/s
>60% stenosis PSV > 280cm/s and/or RAR >4.5
this is for stents after endovascular repair of juxtarenal AAA. hope it helps

This is from an article "Revised duplex criteria outcomes for renal stents and 
stent grafts...." in Journal for Vascular Surgery April 2009(p. 827-837)
by Mohabbat and many others, Cleveland, Ohio

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