Abstract：Objective To investigate the value of the second generation dual-source 128 slices CT coronary angiography (CTCA) in diagnosing patency of bypass after coronary artery bypass grafting. Methods 66 patients who underwent coronary artery bypass grafting received CTCA on 128 slices dual-source CT. The raw data were reconstructed using volume rendering (VR), maximum intensity projection (MIP) and curved planar reformations (CPR). The results of the dual source CT coronary angiography were analyzed. The accuracy of the dual-source CT angiography in the assessment of grafts patency was determined with selective coronary angiography (CAG) as the reference standard in 19 patients. Results All of the 192 bypass grafts were successfully shown in 66 patients. Of 56 left internal mammary artery grafts and 3 radial artery grafts, there were 54 patent grafts (91.5%), 5 restenosis or occlusive grafts (8.5%). Of 133 saphenous vein grafts, 102 grafts (76.7%) were patent, 31 grafts (23.3%) showed restenosis or were occluded. The rate of patency of artery graft was statistically higher than that of vein graft (P＜0.05). In contrast with CAG, the sensitivity, specificity, positive predictive value, negative predictive value, and accuracy were 93.75%, 94.29%, 88.24%, 97.06%, and 94.12% for the dual-source CT to identify restenosis and occlusion in bypass grafts. The two methods are highly consistent (Kappa=0.866). Conclusion The second generation dual-source 128 slices CTCA is an effective method for detecting the patency of bypass after coronary bypass grafting.
