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Purpose: The aim of this study was to evaluate the accuracy of 64-slice multidetector row CT (MDCT), as compared with conventional coronary angiography (CCA), for as- sessing coronary artery bypass grafts (CABG) in the early (< 1 month) postoperative period. Materials and Methods: Twenty-four patients underwent both 64-slice MDCT (0.6 mm collimation, 0.37s gantry rotation) and CCA within 15 days after CABG. Sixty-five by- pass grafts (20 venous grafts and 45 arterial grafts) and 67 distal runoff arteries in 24 patients were included in the analysis. The bypass grafts and distal runoffs were evalu- ated for the presence of significant stenosis, including obstruction. The CT findings were compared with the CCA findings. Results: CCA confirmed that 62 of the 65 grafts were patent and that 3 had significant stenosis or obstruction. Sixty of the 62 patent grafts were correctly identified by MD- CT. One of the three grafts that had significant stenosis was misinterpreted on the MD- CT images. The sensitivity, specificity and positive and negative predictive values for detecting stenosis were 67%, 97%, 50% and 98%, respectively, with an overall diag- nostic accuracy of 95%. MDCT also correctly detected all the stenotic distal runoff ar- teries (4 of 67). Conclusion: 64-slice MDCT is a promising alternative diagnostic modality for evaluat- ing a CABG in the early postoperative period.

Evaluation of Coronary Artery Bypass Grafts in the Early Postoperative Period Using 64-Slice MDCT