Evaluation significance of the computed tomography angiography and digital subtraction angiography in diagnosis and treatment of aortic dissection

Objective To compare the computed tomography angiography(CTA) with digital subtraction angiography(DSA) in the diagnosis of aortic dissection and evaluate the value in thoratic endovascular aortic repair(TEVAR).Methods Forty patients with aortic dissection,who were examined by both CTA and DSA,were analyzed,respectively.The following aspects were compared between CTA and DSA,including intimal tear,aortic diameter,true and false lumen area,the distance from proximal edge of the tear to the left subclavian artery(LSA),thrombosis in the false lumen,calcified plaque,origin of artery branches as well as endoleaks after TEVAR.Results Forty patients who underwent CTA and DSA.TEVAR were performed in 34 cases.No statistical difference was found in the number of tearsand the distance from proximal edge of the tear to LSA and aortic diameter between CTA and DSA.Left iliac artery(LIA) and right iliac artery(RIA) involved in the dissection were discovered in 16(40.0%),6(15.0%) cases by CTA and 15(37.5%),6(15.0%) cases by DSA.There was significant difference in identifying LIA and RIA involved in the dissection between CTA and DSA(P0.05).Thrombosis in the false lumen and calcified plaque was found by CTA and not by DSA.Type I endoleak was detected in 11(32.4%) cases.Conclusion The two methods of CTA and DSA show a good coincident result and have significant value for TEVAR.