The application value of 320-slice CT in follow-up for patients after coronary artery bypass grafts
ZHANG Xue-feng1, LIU Qi1, LU Jian-ping1, JIANG Lian-yong2, XU Bing1, GONG Jing1
1.Department of Radiology, Changhai Hospital, the Second Military Medical University, Shanghai 200433, China; 2.Department of Cardiothoracic Surgery, Xinhua Hospital, Shanghai Jiaotong University School of Medicine, Shanghai 200092, China
Abstract：Objective: To evaluate the value of 320-slice CT in the follow-up after coronary artery bypass grafts(CABG). Method: One hundred and forty-three patients after CABG were studied by 320-slice computed tomography coronary angiography(CTA), images were retrospectively reconstructed under volume rendering technology(VR), maximum intensity projection(MIP), multi-planar reconstruction(MPR) and curved planar reformation(CPR). The image quality and stenosis of grafts, native vessel were evaluated; and compared with the CAG data in 14 cases of coronary angiography at the same period. Result: All the vessels including grafts and native vessel showed satisfactorily. The graft failure was found in 14.2%(53/372). One year after surgery, the patency rates of arterial and venous grafts were 94.3%, 86.3%, the rate of artery grafts lesions showed a progressive increase. There were statistically significant differences of graft patency rate between the chest pain group and non-chest pain group. Compared with 14 patients underwent CAG, the sensitivity, specificity, positive and negative predictive values of 320-slice CT were 92.3%, 100%, 100%, 92.5%. The diagnostic sensitivity, specificity, positive and negative predictive values of native vascular disease were 94.3%, 96.5%, 92.6%, 97.4%. Conclusion: The 320-slice CT in the evaluation of the lesions after CABG grafts has a high accuracy rate, it can be used as the first noninvasive method in follow-up after CABG.
2013, Vol. 24 
