Coronary artery bypass grafts: visualization with MR imaging

Area of Science:

• Cardiovascular Imaging
• Medical Diagnostics
• Radiology

Background:

• Coronary artery bypass grafts (CABGs) are crucial for treating coronary artery disease.
• Accurate visualization of CABGs is essential for post-operative assessment.
• Magnetic resonance (MR) imaging offers a non-invasive imaging modality.

Purpose of the Study:

• To evaluate the efficacy of MR imaging in detecting coronary artery bypass grafts (CABGs).
• To compare MR imaging findings with established operative or angiographic reports.
• To assess the detection rates for different types of bypass grafts.

Main Methods:

• Electrocardiographic-gated MR imaging was performed on 20 patients with CABGs.
• The number and location of grafts were initially unknown to the reviewing team.
• Prospective image review compared detected grafts against surgical/angiographic data.

Main Results:

• MR imaging detected 84% (54/64) of CABGs prospectively, with three false-positive findings.
• Retrospective review, with graft information, improved detection to 88% (56/64).
• Detection rates varied by graft type: 89% for left, 83% for right, and 45% for internal mammary grafts.

Conclusions:

• MR imaging is a viable tool for visualizing patent coronary artery bypass grafts (CABGs).
• While not sufficient for evaluating graft stenosis, MR imaging aids in graft patency assessment.
• Further research may refine MR imaging protocols for enhanced CABG evaluation.