TCT-247 Diagnostic Accuracy of Quantitative Flow Ratio for Assessment of Coronary Stenosis Significance From a Single Angiographic View: A Novel Method Based on Bifurcation Fractal Law

AbstractSeveral studies have demonstrated the feasibility and safety of hemodynamic assessment of non-culprit coronary arteries in setting of acute coronary syndromes (ACS) using fractional flow reserve (FFR) measurements. Quantitative flow ratio (QFR), recently introduced as angiography-based fast FFR computation, has been validated with good agreement and diagnostic performance with FFR in chronic coronary syndromes. The aim of this study was to assess the feasibility and diagnostic reliability of QFR assessment during primary PCI. A total of 321 patients with ACS and multivessel disease, who underwent primary PCI and were planned for staged PCI of at least one non-culprit lesion were enrolled in the analysis. Within this patient cohort, serial post-hoc QFR analyses of 513 non-culprit vessels were performed. The median time interval between primary and staged PCI was 49 [42–58] days. QFR in non-culprit coronary arteries did not change between acute and staged measurements (0.86 vs 0.87, p = 0.114), with strong correlation (r = 0.94, p ≤ 0.001) and good agreement (mean difference -0.008, 95%CI -0.013–0.003) between measurements. Importantly, QFR as assessed at index procedure had sensitivity of 95.02%, specificity of 93.59% and diagnostic accuracy of 94.15% in prediction of QFR ≤ 0.80 at the time of staged PCI. The present study for the first time confirmed the feasibility and diagnostic accuracy of non-culprit coronary artery QFR during index procedure for ACS. These results support QFR as valuable tool in patients with ACS to detect further hemodynamic relevant lesions with excellent diagnostic performance and therefore to guide further revascularisation therapy.

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Abstract 14743: Usefulness of Estimated Coronary Flow Velocity Using Quantitative Flow Ratio for Intermediate Coronary Stenosis

Circulation ◽

10.1161/circ.142.suppl_3.14743 ◽

2020 ◽

Vol 142 (Suppl_3) ◽

Author(s):

Eiji Ichimoto ◽

Nao Konagai ◽

Sawako Horie ◽

Atsushi Hasegawa ◽

Hirofumi Miyahara ◽

...

Keyword(s):

Flow Velocity ◽

Coronary Stenosis ◽

Coronary Flow ◽

Flow Ratio ◽

Operating Characteristics ◽

Fractional Flow ◽

Coronary Flow Velocity ◽

Flow Reserve ◽

Quantitative Flow Ratio ◽

Quantitative Flow

Introduction: Quantitative flow ratio (QFR) is a diagnostic modality for functional assessment for intermediate coronary stenosis without the use of pressure wire. QFR is calculated from 3-dimensional quantitative CAG (3D-QCA) using an advanced algorithm that enables fast computation of the pressure drop caused by coronary stenosis. Hypothesis: We assessed the usefulness of QFR and the association with an estimated coronary flow velocity (eCFV) for intermediate coronary stenosis. Methods: A total of 100 lesions in 80 consecutive patients were assessed Fractional Flow Reserve (FFR) for intermediate coronary stenosis between January 2011 and April 2019. Of these, 97 lesions in 77 patients who underwent QFR were included in this study. Patients were classified into two groups (FFR ≤ 0.80 or FFR > 0.80). QFR and eCFV using contrast were measured by Thrombolysis in Myocardial Infarction (TIMI) frame counts. Results: There was no significant differences in target vessels (p = 0.90) and diffuse lesions (p = 0.06) between the two groups (FFR ≤ 0.80 or FFR > 0.80). Mean FFR and QFR values were 0.78 ± 0.12 and 0.77 ± 0.11, respectively. QFR had a good correlation with FFR values (r = 0.86, p < 0.0001). The diagnostic accuracy, sensitivity, and specificity on QFR ≤ 0.80 were 91.8%, 92.7% and 90.5%, respectively. The eCFV of FFR ≤ 0.80 was greater than that of FFR > 0.80 (0.19 ± 0.08 m/s vs. 0.14 ± 0.06 m/s, p<0.001). Figure showed that the eCFV correlated with FFR values (r = -0.29, p < 0.01). Moreover, the eCFV had a high area under the curve (AUC = 0.71, p < 0.01) on Receiver operating characteristics curve (ROC) analysis with FFR ≤ 0.80. Conclusions: QFR was useful for the assessment of functional stenosis severity. As eCFV was faster, FFR was lower for intermediate coronary stenosis. The eCFV had a good correlation with FFR and may become one of the evaluations for ischemia.

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Prospective validation and comparison of new indexes for the assessment of coronary stenosis: resting full-cycle and quantitative flow ratio

Revista Española de Cardiología (English Edition) ◽

10.1016/j.rec.2020.05.039 ◽

2021 ◽

Vol 74 (1) ◽

pp. 94-97

Author(s):

Carlos Cortés ◽

Fernando Rivero ◽

Enrique Gutiérrez-Ibañes ◽

Álvaro Aparisi ◽

José A. San Román ◽

...

Keyword(s):

Coronary Stenosis ◽

Flow Ratio ◽

Quantitative Flow Ratio ◽

Quantitative Flow

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Meta-Analysis of Diagnostic Performance of Contrast-Fractional Flow Reserve versus Quantitative Flow Ratio for Functional Assessment of Coronary Stenoses

Journal of Interventional Cardiology ◽

10.1155/2020/7352150 ◽

2020 ◽

Vol 2020 ◽

pp. 1-10

Author(s):

Ruitao Zhang ◽

Jianwei Zhang ◽

Lijun Guo

Keyword(s):

Sensitivity And Specificity ◽

Fractional Flow Reserve ◽

Coronary Stenosis ◽

Diagnostic Performance ◽

Meta Analysis ◽

Flow Ratio ◽

Fractional Flow ◽

Flow Reserve ◽

Quantitative Flow Ratio ◽

Quantitative Flow

Background. Use of the fractional flow reserve (FFR) technique is recommended to evaluate coronary stenosis severity and guide revascularization. However, its high cost, time to administer, and the side effects of adenosine reduce its clinical utility. Two novel adenosine-free indices, contrast-FFR (cFFR) and quantitative flow ratio (QFR), can simplify the functional evaluation of coronary stenosis. This study aimed to analyze the diagnostic performance of cFFR and QFR using FFR as a reference index. Methods. We conducted a systematic review and meta-analysis of observational studies in which cFFR or QFR was compared to FFR. A bivariate model was applied to pool diagnostic parameters. Cochran’s Q test and the I2 index were used to assess heterogeneity and identify the potential source of heterogeneity by metaregression and sensitivity analysis. Results. Overall, 2220 and 3000 coronary lesions from 20 studies were evaluated by cFFR and QFR, respectively. The pooled sensitivity and specificity were 0.87 (95% CI: 0.81, 0.91) and 0.92 (95% CI: 0.88, 0.94) for cFFR and 0.87 (95% CI: 0.82, 0.91) and 0.91 (95% CI: 0.87, 0.93) for QFR, respectively. No statistical significance of sensitivity and specificity for cFFR and QFR were observed in the bivariate analysis (P=0.8406 and 0.4397, resp.). The area under summary receiver-operating curve of cFFR and QFR was 0.95 (95% CI: 0.93, 0.97) for cFFR and 0.95 (95% CI: 0.93, 0.97). Conclusion. Both cFFR and QFR have good diagnostic performance in detecting functional severity of coronary arteries and showed similar diagnostic parameters.

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TCT-620 Influence of diabetes mellitus and chronic kidney disease on diagnostic accuracy of Quantitative Flow Ratio (QFR).

Journal of the American College of Cardiology ◽

10.1016/j.jacc.2018.08.1821 ◽

2018 ◽

Vol 72 (13) ◽

pp. B248

Author(s):

Martyna Zaleska ◽

Lukasz Koltowski ◽

Jakub Maksym ◽

Mariusz Tomaniak ◽

Aleksandra Chabior ◽

...

Keyword(s):

Diabetes Mellitus ◽

Chronic Kidney Disease ◽

Kidney Disease ◽

Diagnostic Accuracy ◽

Flow Ratio ◽

Quantitative Flow Ratio ◽

Quantitative Flow

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Is quantitative flow ratio enough to accurately assess intermediate coronary stenosis? A comparison study with fractional flow reserve

Cardiology Journal ◽

10.5603/cj.2019.0116 ◽

2020 ◽

Vol 26 (6) ◽

pp. 793-795

Author(s):

Paweł Kleczyński ◽

Artur Dziewierz ◽

Lukasz Rzeszutko ◽

Dariusz Dudek ◽

Jacek Legutko

Keyword(s):

Fractional Flow Reserve ◽

Coronary Stenosis ◽

Comparison Study ◽

Flow Ratio ◽

Fractional Flow ◽

Flow Reserve ◽

Quantitative Flow Ratio ◽

Quantitative Flow

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Quantitative Flow Ratio Is Associated with Extent and Severity of Ischemia in Non-Culprit Lesions of Patients with Myocardial Infarction

Journal of Clinical Medicine ◽

10.3390/jcm10194535 ◽

2021 ◽

Vol 10 (19) ◽

pp. 4535

Author(s):

Rosalia Dettori ◽

Michael Frick ◽

Kathrin Burgmaier ◽

Richard Karl Lubberich ◽

Martin Hellmich ◽

...

Keyword(s):

Myocardial Infarction ◽

Myocardial Ischemia ◽

Flow Ratio ◽

Previous Myocardial Infarction ◽

Relative Signal Intensity ◽

Coronary Stenoses ◽

Novel Method ◽

Good Diagnostic Accuracy ◽

Quantitative Flow Ratio ◽

Quantitative Flow

Quantitative flow ratio (QFR) is a novel method to assess the relevance of coronary stenoses based only on angiographic projections. We could previously show that QFR is able to predict the hemodynamic relevance of non-culprit lesions in patients with myocardial infarction. However, it is still unclear whether QFR is also associated with the extent and severity of ischemia, which can effectively be assessed with imaging modalities such as cardiac magnetic resonance (CMR). Thus, our aim was to evaluate the associations of QFR with both extent and severity of ischemia. We retrospectively determined QFR in 182 non-culprit coronary lesions from 145 patients with previous myocardial infarction, and compared it with parameters assessing extent and severity of myocardial ischemia in staged CMR. Whereas ischemic burden in lesions with QFR > 0.80 was low (1.3 ± 5.5% in lesions with QFR ≥ 0.90; 1.8 ± 7.3% in lesions with QFR 0.81–0.89), there was a significant increase in ischemic burden in lesions with QFR ≤ 0.80 (16.6 ± 15.6%; p < 0.001 for QFR ≥ 0.90 vs. QFR ≤ 0.80). These data could be confirmed by other parameters assessing extent of ischemia. In addition, QFR was also associated with severity of ischemia, assessed by the relative signal intensity of ischemic areas. Finally, QFR predicts a clinically relevant ischemic burden ≥ 10% with good diagnostic accuracy (AUC 0.779, 95%-CI: 0.666–0.892, p < 0.001). QFR may be a feasible tool to identify not only the presence, but also extent and severity of myocardial ischemia in non-culprit lesions of patients with myocardial infarction.

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