Percutaneous transluminal angioplasty (PTA) is increasingly requested in the therapy of peripheral\narterial occlusive disease. The evaluation of the technical result after balloon angioplasty with regard to bailout\nstenting is highly dependent on the operators´ subjective assessment and mainly based on the monochromatic\ndigital subtraction angiography (DSA) images. The aim of this study was to compare color-coded single image as a\nnovel diagnostic tool with monochromatic DSA for the analysis of flow limitation and need for stent implantation\nafter PTA of superficial femoral artery (SFA) stenoses.\nMethods: During a period of 18 months, 213 SFA lesions were treated by PTA with a standard balloon in 170\npatients, resulting in a total of 193 endovascular procedures. The median age of the patients was 77 years (range,\n35-96 years). Median length of the treated lesions was 10.5 cm (range, 1.0-50 cm). Three interventional radiologists\nretrospectively evaluated the results of balloon angioplasty with monochromatic as well as post-processed colorcoded\nDSA images for flow limitations to decide if subsequent stent implantation was necessary. Consensus\nreading of two experienced interventional radiologists 2 months after the initial review served as reference standard\nto perform a receiver operating characteristics (ROC) analysis.\nResults: ROC analysis for readers A, B and C showed area under the curve (AUC) values of 0.797, 0.865 and 0.804\nfor color-coded DSA and AUC values of 0.792, 0.843 and 0.872 for monochromatic DSA: a significant advantage of\ncolor-coded over conventional monochromatic DSA was not found for..............
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