Coronary artery bypass grafting (CABG) is the standard treatment for advanced coronary artery disease.
It is well known that graft patency is the most important variable that determines the long-term clinical outcome; indeed,
the natural history of CABG involves patency rates of 60% at 10 years for venous grafts and 90% for arterial grafts. Invasive Coronary Angiography (ICA) remains the gold standard tool for the assessment of CABG patency butmultidetector CT has emerged as an non-invasive...
Methods and Materials
47 patients with a history of bypass graft surgery and at least one IMA (Internal Mammary Artery) graft,
for a total of 108 CABG (66 arterial and 42 venous),
underwent coronary CT angiography using a 640-slices CT scanner with prospective gating and step-and-shot protocol with Adaptive Iterative Dose Reduction (AIDR) system 3D,
from January until September 2012.
Exclusion criteria were previous allergic reaction to iodine contrast medium and renal failure (creatinine ≥ 1.5mg/ dl).
Mean effective dose was 5,7 mSv (range between 3,4 and 11,2mSv).
Image quality was judged excellent (score 1) in 74,5% of CABG,
good (score 2) in 14,7%,
fair (score 3) in 7,8% and low (score 4) in 2,9%.
Inter-rater reliability was excellent (k=0.89).
High image quality and low ionizing radiations effective doses make coronary CT angiography using a 640-slices CT with prospective gating an essential tool in the follow-up of patients underwent a CABG.
Coronary Artery Bypass Grafts: Assessment with Multidetector CT in the Early and Late Postoperative Settings.
RadioGraphics 2005; 25:881– 896 L.
Baris ̧ K.
Diagnostic accuracy of 16- versus 64-slice multidetector computed tomography angiography in the evaluation of coronary artery bypass grafts: a comparative study.