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Published on: February 16, 2016
Coronary CT Angiography-based Morphologic Index for Predicting Hemodynamically Significant Coronary Stenosis.
Chenxi Wang1, Shuang Leng1, Ru-San Tan1
1From the National Heart Research Institute Singapore, National Heart Centre Singapore, 5 Hospital Dr, 169609 Singapore (C.W., S.L., R.S.T., J.M.F., C.Y.C., L.B., Y.J.F.K., A.S.L.W., S.J.T.C., S.Y.T., S.T.L., L.Z.); The Second Affiliated Hospital of Nanchang University, Nanchang, China (C.W., Q.W.); Duke-NUS Medical School, Singapore (S.L., R.S.T., J.M.F., C.Y.C., L.B., Y.J.F.K., A.S.L.W., S.J.T.C., S.Y.T., S.T.L., L.Z.); Department of Cardiology, National University Heart Centre, Singapore (P.C., A.F.H.L., M.Y.Y.C.); Yong Loo Lin School of Medicine (P.C., L.L.S.T., C.C.O., Y.J.F.K., A.F.H.L., M.Y.Y.C.) and Department of Biomedical Engineering (L.Z.), National University of Singapore, Singapore; and Department of Diagnostic Imaging, National University Hospital, Singapore (L.L.S.T., C.C.O.).
A new coronary CT angiography index, α×LL/MLD⁴, incorporating lesion entrance angle, accurately predicts significant coronary artery stenosis. This novel index demonstrates superior diagnostic performance compared to existing methods for identifying hemodynamically significant lesions.
Area of Science:
- Cardiovascular Imaging
- Interventional Cardiology
- Radiology
Background:
- Accurate assessment of coronary artery stenosis is crucial for guiding treatment decisions.
- Current methods using coronary CT angiography (CCTA) have limitations in predicting hemodynamic significance.
- Fractional flow reserve (FFR) derived from invasive coronary angiography (ICA) is the gold standard but is invasive.
Purpose of the Study:
- To develop and validate a novel CCTA-based index, α×LL/MLD⁴, incorporating lesion entrance angle (α), lesion length (LL), and minimal lumen diameter (MLD).
- To evaluate the efficacy of α×LL/MLD⁴ in predicting hemodynamically significant coronary stenosis compared to ICA-derived FFR.
- To compare the diagnostic performance of α×LL/MLD⁴ against LL/MLD⁴ and diameter stenosis.
Main Methods:
- Prospective study enrolling 133 participants undergoing both CCTA and ICA.
- Semiautomatic CCTA image processing to measure LL, MLD, and α for calculating α×LL/MLD⁴.
- Comparison of diagnostic performance (accuracy, sensitivity, specificity, PPV, NPV) of α×LL/MLD⁴ and LL/MLD⁴ against invasive FFR ≤ 0.80.
Main Results:
- The α×LL/MLD⁴ index showed significantly higher median values in patients with FFR ≤ 0.80 compared to those with FFR > 0.80 (54.0 vs. 6.7 degree/mm³; P < .001).
- α×LL/MLD⁴ achieved superior per-vessel diagnostic accuracy (86.2%) and sensitivity (83.1%) compared to LL/MLD⁴ (80.5% accuracy, 66.3% sensitivity).
- The area under the ROC curve for α×LL/MLD⁴ (0.93) was significantly greater than for LL/MLD⁴ (0.84) and diameter stenosis (0.63) (P < .001).
Conclusions:
- The novel CCTA-based index, α×LL/MLD⁴, incorporating lesion entrance angle, demonstrates enhanced diagnostic performance in identifying hemodynamically significant coronary stenosis.
- α×LL/MLD⁴ offers improved accuracy and sensitivity over diameter stenosis and the LL/MLD⁴ index for predicting ischemia-causing lesions.
- This index represents a promising non-invasive tool for better risk stratification and management of coronary artery disease.
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