Fractional flow reserve by computerized tomography and subsequent coronary revascularization

Area of Science:

• Cardiovascular Imaging
• Interventional Cardiology
• Medical Diagnostics

Background:

• Coronary artery stenosis assessment traditionally relies on invasive methods.
• Non-invasive functional assessment is crucial for guiding revascularization decisions.
• Fractional flow reserve by computerized tomography (FFR-CT) offers a non-invasive approach.

Purpose of the Study:

• To determine FFR-CT values and their predictive ability for coronary revascularization.
• To evaluate the diagnostic performance of FFR-CT using receiver operator characteristic (ROC) curves.
• To assess the added value of FFR-CT to coronary CT angiography (coronary CTA).

Main Methods:

• Retrospective analysis of 75 consecutive outpatients undergoing coronary CTA and invasive angiography.
• FFR-CT analysis performed on coronary CTA studies, blinded to clinical decisions.
• Stratification of FFR-CT values by coronary artery calcium (CAC) scores.

Main Results:

• Median FFR-CT values differed significantly between revascularized (0.70) and non-revascularized (0.86) coronary arteries.
• FFR-CT showed high positive predictive values (74-88%) and negative predictive values (84-96%) for revascularization.
• The area under the curve (AUC) for FFR-CT (0.920) and combined coronary CTA + FFR-CT (0.941) surpassed coronary CTA alone (0.904).
• FFR-CT maintained diagnostic accuracy with increasing CAC scores, unlike coronary CTA.

Conclusions:

• FFR-CT is a valuable non-invasive tool for assessing the hemodynamic significance of coronary stenosis.
• The integration of FFR-CT with coronary CTA enhances the identification of patients requiring revascularization.
• FFR-CT improves CT-based diagnostic capabilities for guiding coronary revascularization strategies.