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. 2013 Nov 7;9(2):416–429. doi: 10.2215/CJN.02960313

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Figure 4. — Color Doppler ultrasonography (US) evaluation of transplant renal artery stenosis. (A) Normal color Doppler US showing normal peak systolic velocity at the anastomosis site with a value of 0.96 m/sec and normal resistance index of 0.69. (B) Color Doppler US in a patient with transplant renal artery stenosis, with peak systolic velocity of 4.73 m/sec at the anastomosis site. Note color distortion suggesting turbulent flow along with spectral broadening of Doppler wave form (lower section). Iliac velocity (not shown) was 1.3 m/sec, and digital subtraction angiography confirmed hemodynamically significant transplant renal artery stenosis requiring angioplasty and stenting.