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126 patients undergoing surveillance duplex imaging of fem-distal bypass grafts were documented to have a stenosis at one of the two anastomotic sites.  Of the 126 referrals to interventional radiology for possible percutaneous transluminal angioplasty (PTA), 252 anastomoses were evaluated.  118 anastomotic stenoses were confirmed and treated with PTA.  124 anastomoses were free from disease as documented by the duplex study.  In 4 cases, the accelerated flow on spectral analysis could not be explained and the patient was discharged from the radiology suite following the angiogram.  In 6 cases, although the noninvasive findings were within normal limits, a hemodynamically significant lesion was identified.   What is the positive predictive value?

Which organ does NOT empty blood through the portal vein?

What is the best reason for the pulsatility seen in the pulsed wave Doppler spectrum below?    

Using the following values, which type of symptoms would this patient likely be having?

Which is NOT typically exhibited by normal veins of the lower extremity above the knee?

Renal artery flow reducing stenosis is indicated if which finding is seen?

In performing the segmental arterial pressures, where is the pressure recording obtained?

What does spectral broadening seen on the spectral analysis mean?

All are true of spectral analysis except:

Which cannot be used to evaluate chronic venous insufficiency?