2009 Volume 68 Issue 3 Pages 187-191
The use of MDCT angiography has increased for the evaluation after PCI or CABG. This study sought to evaluate the diagnostic accuracy of CABG graft patency. Subjects and methods: The subjects were 32 post-CABG patients who had undergone CT and CAG at the same time for graft evaluation [anastomotic sites, 110]. The findings were rated by using 2 levels, satisfactory patency and obstruction, and were compared against the imaging of CAG. Results: According to CT, patency was rated as satisfactory in 90 and obstructed in 20. CAG was rated as satisfactory patency in 96 and obstructed in 14. The sensitivity, specificity, and positive and negative predictive values were 100%, 93.6%, 70.0% and 100%, respectively. Conclusion: The evaluation of bypass graft after CABG by MDCT is simple and effective because of its high negative predictive value. However, it is associated with a high false positive rate in low flow ITA. It must be used carefully in the evaluation of low flow ITA.
