Clinical value of dual-source CT angiography in diagnosis and following-up observation after endovascular exclusion of Stanford type B aortic dissection / 实用放射学杂志

ABSTRACT

Objective To investigate clinical value of dual-source CT angiography (DSCTA)in diagnosis and following-up obser-vation after endovascular exclusion (EVE)of Stanford type B aortic dissection (AD).Methods 63 cases with type B aortic dissection were diagnosed by DSCTA,and 24 cases among these cases underwent EVE were following-up observed by DSCTA.Imaging recon-struction and analysis were finished at special workstation.All CT findings of dissection were carefully observed in every case,CT values of true and false lumens were measured at arterial-phase.The length and the width of proximal neck,and the maximum di-ameter of AD were measured in those cases that initial crevasse located at aortic arch or proximal descending thoracic aorta.The out-comes and complications of 24 cases underwent EVE were focused.Results The extension of dissection,the site of crevasse,mor-phological features of true and false lumens and tearing intimal flap,and involving main branches of aorta were accurately shown by DSCTA.Average CT value of true lumen was higher than false lumen at arterial-phase in all cases (P=0.000).In 60 cases that ini-tial crevasse located at aortic arch or proximal descending thoracic aorta,the length and the width of proximal neck of dissection changed from 0.3 cm to 9.6 cm(average 3.4 cm)and from 2.3 cm to 3.8 cm(average 2.9 cm)respectively,and the maximum di-ameter of AD was between 3.1 cm and 9.0 cm(average 5.3 cm).AD after EVE did not unceasingly enlarge in all 24 cases,false lu-men shrinked in 1 1 cases,thrombus in false lumen added in most cases,stent endoleaking were observed in 1 1 cases.Conclusion DSCTA with convenient,effective and non-invasive advantages,is one of important imaging methods in diagnosis and following-up observation after EVE of type B aortic dissection.