Abstract:

[Abstract] Objective To explore the clinical value of the duplex ultrasonography (duplex US) for evaluating the re? stenosis after peripheral arterial bypass grafting.Methods Eighty prosthetic grafts of sixty-three patients with femoral-pop? liteal arterial bypass grafting were follow-up regularly by duplex US. They were divided into non significant stenosis group (n=56), the significant stenosis group (n=15) and occlusion group (n=9) according to the tube diameter and arterial blood flow? ing parameters, which changed postoperatively. The diagnostic results were compared and analyzed between duplex US and digital subtraction angiography (DSA). The peak flow velocity of middle grafts (MG) to40cm/s was defined to evaluate risk of graft occlusion.Results The diagnostic coincidence rate of duplex US and DSA for grafts stenosis classification was 90%. The diagnostic sensitivity of duplex US to grafts stenosis was91.7%, and the specificity was92.9%. The positive pre? dictive value was84.6% for grafts stenosis, and the negative predictive value was96.3%, the false positive rate was16.7%, and the false negative rate was8.3%. The grafts occlusion rate was higher in MG＜40cm/s group than that of MG≥40cm/s group.Conclusion There was a good consistency with Duplex US and DSA for the diagnosis of peripheral artery bypass graft restenosis. Duplex US showed characteristics of non-invasive, simple and easily accepted by patients.

Key words: duplex ultrasonography, peripheral arterial bypass grafting, prosthetic graft