Abstract
Objectives: We explored the anatomical, plaque, and hemodynamic characteristics of high-risk non-obstructive coronary lesions that caused acute coronary syndrome (ACS). Methods: From the EMERALD study which included ACS patients with available coronary CT angiography (CCTA) before the ACS, non-obstructive lesions (percent diameter stenosis < 50%) were selected. CCTA images were analyzed for lesion characteristics by independent CCTA and computational fluid dynamics core laboratories. The relative importance of each characteristic was assessed by information gain. Results: Of the 132 lesions, 24 were the culprit for ACS. The culprit lesions showed a larger change in FFRCT across the lesion (ΔFFRCT) than non-culprit lesions (0.08 ± 0.07 vs 0.05 ± 0.05, p = 0.012). ΔFFRCT showed the highest information gain (0.051, 95% confidence interval [CI] 0.050–0.052), followed by low-attenuation plaque (0.028, 95% CI 0.027–0.029) and plaque volume (0.023, 95% CI 0.022–0.024). Lesions with higher ΔFFRCT or low-attenuation plaque showed an increased risk of ACS (hazard ratio [HR] 3.25, 95% CI 1.31–8.04, p = 0.010 for ΔFFRCT; HR 2.60, 95% CI 1.36–4.95, p = 0.004 for low-attenuation plaque). The prediction model including ΔFFRCT, low-attenuation plaque and plaque volume showed the highest ability in ACS prediction (AUC 0.725, 95% CI 0.724–0.727). Conclusion: Non-obstructive lesions with higher ΔFFRCT or low-attenuation plaque showed a higher risk of ACS. The integration of anatomical, plaque, and hemodynamic characteristics can improve the noninvasive prediction of ACS risk in non-obstructive lesions. Key Points: • Change in FFRCTacross the lesion (ΔFFRCT) was the most important predictor of ACS risk in non-obstructive lesions. • Non-obstructive lesions with higher ΔFFRCTor low-attenuation plaque were associated with a higher risk of ACS. • The integration of anatomical, plaque, and hemodynamic characteristics can improve the noninvasive prediction of ACS risk.
Original language | English |
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Pages (from-to) | 6119-6128 |
Number of pages | 10 |
Journal | European Radiology |
Volume | 29 |
Issue number | 11 |
DOIs | |
State | Published - 1 Nov 2019 |
Keywords
- Acute coronary syndrome
- Computed tomography angiography
- Coronary stenosis
- Hemodynamics
- Plaque, atherosclerotic