Comparison Of Lower Extremity Arterial Occlusive Disease Imaging

ObjectiveTo compare the accuracy, sensitivity and specificity of CT angiography (CTA) and color Doppler flow imaging (CDFI) in diagnosis of lower extremity Arterioselerosis Obliterans with digital subtraction angiography as criteria.Materials and MethodsCollecting 2,010 in January to 2008 in February,42 cases of suspected lower extremity arterial occlusive disease inpatients, has to CDFI, CTA and DSA. Divided into 3 groups according to lesion, the femoral artery group:lesions in the femoral artery; popliteal artery group:lesions in the popliteal artery; tibial artery group:lesions in the anterior tibial, posterior tibial artery. In accordance with the narrow segments of the narrow rate S will be divided into four lesions,0:no lesions or S≤10%; 1:11%≤S<50%; 2:50%≤S≤99%; 3:completely occlusion. When a segmental vessels with multiple lesions, in order to narrow the highest rate shall prevail.42 patients with suspected lower extremity arterial occlusive disease, a total of 225 vessels. CDFI examination revealed stenosis calculated the sensitivity, specificity, positive predictive value, negative predictive value and accuracy, using SPSS13.0 statistical software, using paired chi-square test, test level a= 0.05, compared with DSA, CDFI examination of the ASO with or without statistical difference between the narrow diagnosis. CTA examination revealed stenosis calculated the sensitivity, specificity, positive predictive value, negative predictive value and accuracy, using SPSSI3.0 statistical software, using paired chi-square test, test level a= 0.05, compared with DSA, CTA, of the ASO with or without statistical difference between the narrow diagnosis. Respectively CDFI examination and CTA examination showed a narrow stricture rate of DSA, consistency analysis, application SPSS 13.0 software for data processing, consistency analysis using Kappa test, P<0.05 as statistical difference between whether or not the standard.ResultsTo DSA, as the gold standard, CDFI check stock, popliteal and tibial artery stenosis group found that the sensitivity was 90%,79%and 95%, specificity 61%,57%and 91%, accuracy rates were 77%,63%and 92%; shares and tibial artery group CDFI examination and DSA, stenosis was found there was no statistical difference (p≥0.05). Popliteal artery group DSA, stenosis was found better than CDFI examination, CDFI examination revealed a narrow stenosis with DSA, the rate has good consistency (Kappa).To DSA, as the gold standard, CTA examination of the stock, popliteal and tibial artery stenosis group found a sensitivity of 93%,84%and 85%, specificity was 73%,89%and 95%, accuracy was 84%88%and 95%; CTA and DSA inspection method inspection found no significant difference between stenosis (p≥0.05). CTA examination revealed a narrow stenosis with DSA, the rate has good consistency (Kappa).ConclusionCDFI and CTA diagnosis of the stenosis with high sensitivity,specificity and accuracy. CDFI and CTA found the narrow parts of the coincidence rate in line with the DSA. CDFI and CTA can be used for lower extremity arterial occlusive disease as a preliminary diagnosis,screening and follow-up.