Key result
Helical CT scan evaluated coronary artery bypass graft patency with 96.4% overall accuracy for vein grafts, but lower accuracy for internal thoracic (64.7%) and radial (45.5%) arteries.
Why the study?
Does helical CT scan accurately evaluate coronary artery bypass graft patency compared to coronary angiography in post-bypass patients?
Observational (n=140)
No
Does helical CT scan accurately evaluate coronary artery bypass graft patency compared to coronary angiography in post-bypass patients?
Answers are grounded in this paper and cite their sources.
Helical CT scan is highly accurate for evaluating vein graft patency after bypass surgery, but has limited accuracy for arterial grafts.
The patency of coronary artery bypass grafts was evaluated by helical computed tomographic (CT) scan. One hundred forty patients who received an enhanced chest CT scan and a coronary angiography after bypass surgery were studied before discharge at the Fukui Cardiovascular Center. Among them was a total of 398 grafts and 436 anastomoses. For the evaluation of 248 vein grafts, the CT scan showed a 99.5% correct positive ratio and an overall accuracy of 96.4%. In 122 internal thoracic arteries tested, an overall accuracy of 64.7% was obtained. In gastroepiploic artery tests the overall accuracy was 33.3% and in radial artery tests it was 45.5%. Thirty-seven venous sequential anastomoses in 34 grafts and 1 internal thoracic artery sequential anastomosis were also evaluated. In the venous sequential anastomosis, the CT scan showed a 73.0% of accuracy overall. This study showed that the helical CT scan was useful to evaluate graft patency following bypass surgery.
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Ueyama et al. (1999) conducted an observational in Coronary artery bypass grafts (n=140). Helical computed tomographic (CT) scan vs. Coronary angiography was evaluated on Patency of coronary artery bypass grafts. Helical CT scan evaluated coronary artery bypass graft patency with 96.4% overall accuracy for vein grafts, but lower accuracy for internal thoracic (64.7%) and radial (45.5%) arteries.
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