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[Visualization of aorto-coronary bypass grafts with the aid of non-dynamic computer tomography]
Insights
Non-dynamic computed tomography (CT) effectively visualizes aorto-coronary bypass graft patency, accurately identifying patent grafts in most cases. However, CT cannot determine the functional status of these bypass grafts.
Area of Science:
- Cardiovascular Imaging
- Radiology
- Surgical Assessment
Background:
- Aorto-coronary bypass grafts are crucial for treating coronary artery disease.
- Assessing bypass graft patency is vital for patient outcomes.
- Non-invasive imaging modalities are sought to evaluate bypass graft status.
Purpose of the Study:
- To evaluate the efficacy of non-dynamic computed tomography (CT) in assessing aorto-coronary bypass graft patency.
- To compare CT findings with postoperative coronary angiography results.
Main Methods:
- 45 patients with 85 aorto-coronary bypass grafts were studied using non-dynamic CT.
- CT scans were performed before and after intravenous contrast material injection.
- Graft patency was correlated with postoperative coronary angiography in a subset of patients.
Main Results:
- CT visualized 81.1% of grafts that were angiographically patent or not checked postoperatively.
- CT correctly identified 86.5% of angiographically confirmed patent grafts.
- All 11 definitely occluded grafts were not visualized by CT, with one exception of differing evaluator judgment.
Conclusions:
- Non-dynamic CT demonstrates high accuracy in identifying patent aorto-coronary bypass grafts.
- The technique is valuable for assessing bypass graft patency post-surgery.
- CT currently does not provide information on the functional status of bypass grafts.
Abstract:
To evaluate computer tomography (CT) for assessment of aorto-coronary bypass graft patency, 45 patients with 85 grafts were studied by non-dynamic CT before and after intravenous bolus injection of 50 ml contrast material. 28 patients had undergone postoperative coronary angiography (37 grafts patent, 11 occluded), while 17 (37 grafts) were studied in the early postoperative period without angiographic confirmation. 60 of 74 grafts (81.1%) which were angiographically patent or not checked by postoperative angiography could be visualized by CT. In patients in whom graft patency was documented by angiography, 32 of 37 grafts (86.5%) were identified correctly, including all 18 grafts (100%) to the left anterior descending branch (LAD). With the exception of one LAD graft which was judged differently by the two evaluators, none of the 11 definitely occluded grafts could be visualized by CT. The results suggest that non-dynamic CT allows correct identification of patent aorto-coronary bypass grafts in a high percentage of cases. So far, however, the method does not allow any deduction as to the functional status of the grafts.