Application and Performance of CT-Fractional Flow Reserve in Non-ST-Segment Elevation Myocardial Infarction

Area of Science:

• Cardiology
• Radiology
• Medical Imaging

Background:

• Non-ST-segment elevation myocardial infarction (NSTEMI) patients often lack obstructive coronary artery disease (CAD) on invasive angiography.
• A reliable non-invasive method to exclude obstructive CAD is needed for NSTEMI patients.

Purpose of the Study:

• To evaluate the diagnostic performance of computed tomography fractional flow reserve (CT-FFR) in NSTEMI patients.
• To compare CT-FFR accuracy against coronary computed tomography angiography (CCTA) alone and invasive methods.

Main Methods:

• Invasive coronary angiography (ICA) with fractional flow reserve (FFR) measurements served as the gold standard.
• CT-FFR was performed on coronary computed tomography angiography (CCTA) images prior to ICA in NSTEMI inpatients.
• CT-FFR and CCTA performance were assessed against ICA plus FFR for obstructive CAD detection.

Main Results:

• CT-FFR demonstrated strong correlation with invasive FFR (r=0.78).
• Per-vessel analysis showed high accuracy for CT-FFR (AUC 0.93), superior to CCTA alone (AUC 0.87).
• CT-FFR achieved 100% diagnostic accuracy on a per-patient basis.

Conclusions:

• CT-FFR significantly improves diagnostic accuracy for obstructive CAD in NSTEMI patients compared to CCTA alone.
• CT-FFR is a valuable non-invasive tool for NSTEMI evaluation, correlating well with invasive FFR.