Correlation analysis between lower extremity CTA and ABI about diabetic lower extremity disease / 实用放射学杂志

ABSTRACT

Objective To investigate the correlation between lower extremity CTA and ankle brachial index (ABI) of the diabetic lower extremity arterial disease (LEAD),and to study the difference of the examination methods.Methods 80 patients of clinical diagnosed with diabetic LEAD that underwent CTA check were enrolled.The indexes of ABImax,ABImin,ABIave and lower limb atherosclerosis integral (LEAI) of the 80 patients were calculated respectively,and the relationship and correlation were analyzed between ABI and LEAI in different degree of lower extremity arterial calcification.Results ABI index of 58 (58/80) cases could be determined,with an average of 0.87.CTA results displayed that below-the-knee artery had a high incidence of atherosclerosis.According to the degree of arterial calcification,non-calcified in 4(4/58) cases,mild in 20(20/58),moderate in 10(10/58),and severe in 24(24/58).The patients with moderate and severe calcification,means the arterial calcification,had lower ABI (P =0.001),higher LEAI (P ＜ 0.001),and higher pressure of brachial artery(P =0.03).There was weak correlation between ABImax and LEAI(r =-0.48) and the best correlation between ABIave and LEAI(r=-0.59).The correlations between ABI and LEAI of non calcified cases were better than that of calcified ones.Conclusion ABI monitoring of diabetic LEAD has some limitations.Diabetic lower extremity artery CTA has important clinical value that can accurately assess the degree of arterial calcification and occlusion.