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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?

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

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

Which is not a site for pulse palpation?

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

All are true of spectral analysis except:

What does spectral broadening seen on the spectral analysis mean?

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

Is the poststenotic flow zone, there may be frank swirling movements called:

Which common carotid artery arises directly from the aortic arch?