Diagnostic value of quantitative stenosis predictors with coronary CT angiography compared to invasive fractional flow reserve

Objective: To evaluate the diagnostic performance of CCTA-derived stenosis predictors including CT-FFR for the detection of ischemia-inducing stenosis compared to invasive FFR. Materials and methods: Stenosis parameters were assessed using dual-source CT (DSCT). All patients underwent both CCTA and invasive FFR within 3 months and were retrospectively analyzed. Observers visually assessed all CCTA studies and performed multiple lesion measurements. Lesion length/minimal luminal diameter(4) (LLIMLD4), transluminal attenuation gradient (TAG), corrected coronary attenuation (CCO) and CT-FFR were calculated. Results: The cohort included 32 patients (58 +/- 12 years, 66%male). Among 32 coronary lesions, 8(25%) were considered hemodynamically significant with an FFR <0.80. Compared to invasive FFR, the pervessel sensitivity and specificity of CCTA, CT-FFR, LLIMLD4, CCO and TAG for detecting hemodynamically significant lesions were 100% and 54%, 100% and 91%, 85% and 92%, 66% and 88%, 37% and 58%, respectively. Receiver operating characteristics analysis resulted in an area under the curve of 0.91 for CT-FFR (p=0.0005), 0.88 for LLIMLD4 (p < 0.0001), 0.85 for CCO (p < 0.0001). TAG with an AUC of 0.67 (p=0.152) was unable to discriminate between vessels with or without hemodynamically significant lesions. Conclusion: CT-FFR,LLIMLD4 and CCO provide enhanced diagnostic performance over CCTA analysis alone for discrimination of hemodynamically significant coronary stenosis. (C) 2015 Elsevier Ireland Ltd. All rights reserved.