Non-invasive coronary bypass graft imaging after multivessel revascularisation

Area of Science:

• Cardiovascular Imaging
• Medical Diagnostics
• Surgical Outcomes

Background:

• Coronary artery bypass grafting (CABG) is a common treatment for multivessel coronary artery disease.
• Monitoring graft patency is crucial for long-term patient outcomes.
• Non-invasive imaging modalities are sought for reliable post-surgical assessment.

Purpose of the Study:

• To evaluate the accuracy of subsecond spiral computed tomography (CT) and contrast-enhanced magnetic resonance angiography (MRA) in assessing coronary graft patency.
• To compare the diagnostic performance of spiral CT and MRA against conventional angiography.
• To determine the potential of these non-invasive techniques for long-term follow-up after multivessel revascularization.

Main Methods:

• Study included 40 asymptomatic patients (mean age 59.9 years) with at least three bypass grafts.
• Graft patency was assessed using spiral CT and 3D contrast-enhanced MRA, with conventional angiography as the reference standard.
• A total of 133 grafts (37 internal mammary artery, 96 venous grafts) were analyzed.

Main Results:

• Spiral CT showed sensitivities of 76% for internal mammary artery (IMA) and 100% for venous grafts.
• MRA demonstrated sensitivities of 100% for IMA and 92% for venous grafts.
• Positive predictive values were 100% for both techniques across graft types, with no statistically significant differences (P=ns).

Conclusions:

• Subsecond spiral CT and contrast-enhanced MRA are highly accurate non-invasive methods for assessing coronary graft patency.
• These imaging techniques show significant potential for long-term follow-up of patients post-coronary bypass surgery.
• Both modalities provide reliable assessment of internal mammary artery and venous graft patency.