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Liang H, Zhang Q, Gao Y, Chen G, Bai Y, Zhang Y, Cui K, Wang Q, Cao S, Hou Y, Zhang H, Ghista DN, Liu X, Xiu J. Diagnostic performance of angiography-derived fractional flow reserve analysis based on bifurcation fractal law for assessing hemodynamic significance of coronary stenosis. Eur Radiol 2023; 33:6771-6780. [PMID: 37133521 DOI: 10.1007/s00330-023-09682-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2022] [Revised: 03/10/2023] [Accepted: 03/26/2023] [Indexed: 05/04/2023]
Abstract
OBJECTIVES Blood flow into the side branch affects the calculation of coronary angiography-derived fractional flow reserve (FFR), called Angio-FFR. Neglecting or improperly compensating for the side branch flow may decrease the diagnostic accuracy of Angio-FFR. This study aims to evaluate the diagnostic accuracy of a novel Angio-FFR analysis that considers the side branch flow based on the bifurcation fractal law. METHODS A one-dimensional reduced-order model based on the vessel segment was used to perform Angio-FFR analysis. The main epicardial coronary artery was divided into several segments according to the bifurcation nodes. Side branch flow was quantified using the bifurcation fractal law to correct the blood flow in each vessel segment. In order to verify the diagnostic performance of our Angio-FFR analysis, two other computational methods were taken as control groups: (i) FFR_s: FFR calculated by delineating the coronary artery tree to consider side branch flow, (ii) FFR_n: FFR calculated by just delineating the main epicardial coronary artery and neglecting the side branch flow. RESULTS The analysis of 159 vessels from 119 patients showed that our Anio-FFR calculation method had comparable diagnostic accuracy to FFR_s and provided significantly higher diagnostic accuracy than that of FFR_n. In addition, using invasive FFR as a reference, the Pearson correlation coefficients of Angio-FFR and FFRs were 0.92 and 0.91, respectively, while that of FFR_n was only 0.85. CONCLUSIONS Our Angio-FFR analysis has demonstrated good diagnostic performance in assessing the hemodynamic significance of coronary stenosis by using the bifurcation fractal law to compensate for side branch flow. CLINICAL RELEVANCE STATEMENT Bifurcation fractal law can be used to compensate for side branch flow during the Angio-FFR calculation of the main epicardial vessel. Compensating for side branch flow can improve the ability of Angio-FFR to diagnose stenosis functional severity. KEY POINTS • The bifurcation fractal law could accurately estimate the blood flow from the proximal main vessel into the main branch, thus compensating for the side branch flow. • Angiography-derived FFR based on the bifurcation fractal law is feasible to evaluate the target diseased coronary artery without delineating the side branch.
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Affiliation(s)
- Hongbin Liang
- Department of Cardiology, Nanfang Hospital, Southern Medical University, Guangzhou, China
| | - Qiuxia Zhang
- Department of Cardiology, Nanfang Hospital, Southern Medical University, Guangzhou, China
| | - Yiting Gao
- Department of Cardiology, Nanfang Hospital, Southern Medical University, Guangzhou, China
| | - Guojun Chen
- Department of Cardiology, Nanfang Hospital, Southern Medical University, Guangzhou, China
| | - Yujia Bai
- Department of Cardiology, Nanfang Hospital, Southern Medical University, Guangzhou, China
| | - Yanan Zhang
- Department of Cardiology, Nanfang Hospital, Southern Medical University, Guangzhou, China
| | - Kai Cui
- Department of Cardiology, Nanfang Hospital, Southern Medical University, Guangzhou, China
| | - Qiancheng Wang
- Department of Cardiology, Nanfang Hospital, Southern Medical University, Guangzhou, China
| | - Shiping Cao
- Department of Cardiology, Nanfang Hospital, Southern Medical University, Guangzhou, China
| | - Yuqing Hou
- Department of Cardiology, Nanfang Hospital, Southern Medical University, Guangzhou, China
| | - Heye Zhang
- School of Biomedical Engineering, Sun Yat-Sen University, Shenzhen, China
| | | | - Xiujian Liu
- School of Biomedical Engineering, Sun Yat-Sen University, Shenzhen, China.
| | - Jiancheng Xiu
- Department of Cardiology, Nanfang Hospital, Southern Medical University, Guangzhou, China.
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Caullery B, Riou L, Barone-Rochette G. Coronary Angiography Upgraded by Imaging Post-Processing: Present and Future Directions. Diagnostics (Basel) 2023; 13:diagnostics13111978. [PMID: 37296830 DOI: 10.3390/diagnostics13111978] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2023] [Revised: 05/30/2023] [Accepted: 05/31/2023] [Indexed: 06/12/2023] Open
Abstract
Advances in computer technology and image processing now allow us to obtain from angiographic images a large variety of information on coronary physiology without the use of a guide-wire as a diagnostic information equivalent to FFR and iFR but also information allowing for the performance of a real virtual percutaneous coronary intervention (PCI) and finally the ability to obtain information to optimize the results of PCI. With specific software, it is now possible to have a real upgrading of invasive coronary angiography. In this review, we present the different advances in this field and discuss the future perspectives offered by this technology.
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Affiliation(s)
- Benoit Caullery
- Department of Cardiology, University Hospital, 38000 Grenoble, France
| | - Laurent Riou
- University Grenoble Alpes, INSERM, CHU Grenoble Alpes, LRB, 38000 Grenoble, France
| | - Gilles Barone-Rochette
- Department of Cardiology, University Hospital, 38000 Grenoble, France
- University Grenoble Alpes, INSERM, CHU Grenoble Alpes, LRB, 38000 Grenoble, France
- French Clinical Research Infrastructure Network, 75018 Paris, France
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Kekenes-Huskey PM. Toward bedside computation of myocardial infarction risk using noninvasive analysis of patients living with coronary artery disease. Am J Physiol Heart Circ Physiol 2023; 324:H172-H174. [PMID: 36563013 PMCID: PMC9829457 DOI: 10.1152/ajpheart.00628.2022] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/08/2022] [Revised: 11/22/2022] [Accepted: 11/29/2022] [Indexed: 12/24/2022]
Affiliation(s)
- Peter Michael Kekenes-Huskey
- Department of Cell and Molecular Physiology, Stritch School of Medicine, Loyola University Chicago, Chicago, Illinois
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4
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Kern MJ, Seto AH. Does Diabetes Affect Angiographically Derived (QFR) Translesional Physiology? J Am Coll Cardiol 2022; 80:1265-1267. [DOI: 10.1016/j.jacc.2022.07.020] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/29/2022] [Revised: 07/07/2022] [Accepted: 07/11/2022] [Indexed: 10/14/2022]
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Abstract
Arterial stenosis is a problem of immediate significance, as cardiovascular disease is the number one leading cause of death worldwide. Generally, the study of stenotic flow assumes a smooth, curved stenosis and artery. However, the real situation is unlikely to present an infinitely smooth-surfaced arterial stenosis. Here, the impact of surface roughness on the flow in an arterial stenosis was studied via a computational fluid dynamics analysis. A patient-specific geometry with a smooth surface was reconstructed, and a partially rough model was built by artificially adding random roughness only on the stenotic region of the smooth model. It was found that the flow was oscillatory downstream of the stenosis in the models. A slightly lower velocity near the wall and more oscillatory flows were observed due to the presence of the roughness in the stenotic region. However, the pressure distributions did not vary significantly between the smooth and rough models. The differences in the wall shear metrics were slight in the stenotic region and became larger in the downstream region of the models.
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Zhou Z, Zhu B, Fan F, Yang F, Fang S, Wang Z, Qiu L, Gong Y, Huo Y. Prognostic Value of Coronary Angiography-Derived Fractional Flow Reserve Immediately After Stenting. Front Cardiovasc Med 2022; 9:834553. [PMID: 35387443 PMCID: PMC8978525 DOI: 10.3389/fcvm.2022.834553] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2022] [Accepted: 02/24/2022] [Indexed: 11/13/2022] Open
Abstract
Objectives The aim of this study was to investigate the potential prognostic value of post-percutaneous coronary intervention (PCI) angiography-derived fractional flow reserve (FFR) and its gradient across the stent. Background Post-PCI FFR and its gradient across the stent have been proved to be associated with clinical outcomes. However, little is known about the prognostic value of post-PCI coronary angiography-derived FFR and its gradient across the stent. Methods Patients diagnosed with coronary heart disease and participated in drug-eluting stent (DES) clinical trials for stent implantation in a single center were included for this retrospective analysis. A novel coronary angiography-derived FFR (caFFR) and its gradient across the stent were calculated offline using two projections from coronary angiography performed after PCI. Clinical follow-up was completed at 9 months after the index procedure and the primary outcome was target vessel failure (TVF), defined as a composite of target vessel-related myocardial infarction (MI), target vessel-related revascularization (TVR), and cardiac death. Coronary angiography was also performed at the 9 months follow-up time to get data of late lumen loss (LLL) and percent diameter stenosis (%DS). Results A total of 159 vessels in 136 patients were analyzed. The mean value of post-PCI caFFR was 0.90 ± 0.06. The median value of trans-stent caFFR gradient (ΔcaFFRstent) was 0.04 (interquartile range 0.02-0.08). ΔcaFFRstent>0 was demonstrated in 147 vessels (92.45%). The TVF rate was significantly higher in patients with post-PCI caFFR < 0.90 (4 [8.16%] vs. 1 [1.15%], P = 0.037), which was mainly achieved by the difference between the TVR rate. In the subgroup with lesions located in the left anterior descending coronary artery (LAD), post-PCI caFFR was an independent predictor of LLL (β = -1.07, 95% CI: -1.74 to -0.39, P = 0.002) and %DS at follow-up (β = -30.24, 95% CI: -56.44 to -4.04, P = 0.025), ΔcaFFRstent was an independent predictor of LLL (β=0.98, 95% CI:0.13-1.83, P = 0.026). Conclusion Suboptimal post-PCI caFFR and trans-stent caFFR gradient were common among vessels immediately after stenting. Lower post-PCI caFFR was associated with a higher rate of 9-month TVF. After LAD PCI, both post-PCI caFFR and its gradient across stent were independent predictors of the neointimal proliferation of the target vessel evaluated by LLL and %DS at follow-up.
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Affiliation(s)
- Zuoyi Zhou
- Department of Cardiology, Peking University First Hospital, Beijing, China
| | - Baozhen Zhu
- Department of Cardiology, Peking University First Hospital, Beijing, China.,Department of Intervention, Tongxin People's Hospital, Tongxin, China
| | - Fangfang Fan
- Department of Cardiology, Peking University First Hospital, Beijing, China
| | - Fan Yang
- Department of Cardiology, Peking University First Hospital, Beijing, China
| | - Shu Fang
- Department of Cardiology, Peking University First Hospital, Beijing, China
| | - Zhi Wang
- Department of Cardiology, Peking University First Hospital, Beijing, China
| | - Lin Qiu
- Department of Cardiology, Peking University First Hospital, Beijing, China
| | - Yanjun Gong
- Department of Cardiology, Peking University First Hospital, Beijing, China
| | - Yong Huo
- Department of Cardiology, Peking University First Hospital, Beijing, China
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Nudi A, Biondi-Zoccai G, Versaci F, Nudi F. Promises and pitfalls of relying on angiography-derived indexes to identify myocardial ischemia: A tale of Romulus and Remus. J Nucl Cardiol 2022; 29:359-362. [PMID: 32910417 DOI: 10.1007/s12350-020-02313-y] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2020] [Accepted: 07/16/2020] [Indexed: 02/05/2023]
Affiliation(s)
- Alessandro Nudi
- Service of Hybrid Cardiac Imaging, Madonna Della Fiducia Clinic, Rome, Italy
| | - Giuseppe Biondi-Zoccai
- Department of Medical-Surgical Sciences and Biotechnologies, Sapienza University of Rome, Latina, Italy
- Mediterranea Cardiocentro, Naples, Italy
| | - Francesco Versaci
- Unità Operativa Complessa di UTIC Emodinamica e Cardiologia, Ospedale Santa Maria Goretti, Latina, Italy
| | - Francesco Nudi
- Service of Hybrid Cardiac Imaging, Madonna Della Fiducia Clinic, Rome, Italy.
- Ostia Radiologica, Rome, Italy.
- Replycare, Rome, Italy.
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Torii R, Yacoub MH. CT-based fractional flow reserve: development and expanded application. Glob Cardiol Sci Pract 2021; 2021:e202120. [PMID: 34805378 PMCID: PMC8587224 DOI: 10.21542/gcsp.2021.20] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2021] [Accepted: 09/30/2021] [Indexed: 11/28/2022] Open
Abstract
Computations of fractional flow reserve, based on CT coronary angiography and computational fluid dynamics (CT-based FFR) to assess the severity of coronary artery stenosis, was introduced around a decade ago and is now one of the most successful applications of computational fluid dynamic modelling in clinical practice. Although the mathematical modelling framework behind this approach and the clinical operational model vary, its clinical efficacy has been demonstrated well in general. In this review, technical elements behind CT-based FFR computation are summarised with some key assumptions and challenges. Examples of these challenges include the complexity of the model (such as blood viscosity and vessel wall compliance modelling), whose impact has been debated in the research. Efforts made to address the practical challenge of processing time are also reviewed. Then, further application areas—myocardial bridge, renal stenosis and lower limb stenosis—are discussed along with specific challenges expected in these areas.
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Affiliation(s)
- Ryo Torii
- Department of Mechanical Engineering, University College London, London, UK
| | - Magdi H Yacoub
- Department of Surgery and Department of Cardiology, Aswan Heart Centre, Magdi Yacoub Heart Foundation, Aswan, Egypt.,Magdi Yacoub Institute, Harefield Heart Science Centre, Harefield, UK.,National Heart and Lung Institute, Imperial College London, UK
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Computerized technologies informing cardiac catheterization and guiding coronary intervention. Am Heart J 2021; 240:28-45. [PMID: 34077744 DOI: 10.1016/j.ahj.2021.05.017] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/14/2021] [Accepted: 05/22/2021] [Indexed: 11/21/2022]
Abstract
Advances in image processing and computer hardware have enabled the development of user-friendly software which operate in real-time and can be used in the catheterization laboratory to facilitate percutaneous coronary intervention (PCI). The two dimensional-(2D) quantitative coronary angiography (QCA) systems that have traditionally been used to assess lesion severity have been replaced by 3D-QCA systems, enabling more reliable evaluation of vessel geometry and lesion dimensions. This also allows 3D reconstruction of coronary bifurcation anatomy and generation of models that can be processed by computational fluid dynamic techniques to reliably detect flow-limiting lesions. More recently, software has been introduced that has the capability of generating a digital silhouette of the coronary arteries superimposed onto X-ray angiography to facilitate wire crossing and stent placement, and potentially reduce contrast use. In parallel, methodologies have been developed that operate with an accessible interface and can process intravascular imaging data, reliably quantify lesion severity and co-register intravascular and X-ray angiographic data to comprehensively assess plaque distribution and guide PCI. The above advances are used in daily practice to improve procedural results and outcomes. This review aims to provide an overview of the developments in the field - it presents the computer-based technologies that have been designed to accurately assess lesion severity, summarizes the advantages and limitations of the systems introduced to co-register imaging data and discusses the potential value of the existing and emerging software in the catheterization laboratory.
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Kern MJ. Quantitative Flow Ratio, 2D Physiological Mapping, and the Negative Impact of Diffuse Disease on PCI Outcomes. JACC Cardiovasc Interv 2021; 14:1786-1788. [PMID: 34412796 DOI: 10.1016/j.jcin.2021.07.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/29/2021] [Accepted: 07/01/2021] [Indexed: 11/26/2022]
Affiliation(s)
- Morton J Kern
- Long Beach Veterans Administration Medical Center, Long Beach, California, USA.
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Kern MJ, Seto AH. Comparing
QFR
and
FFR
in small vessels—Expanding the spectrum of use. Catheter Cardiovasc Interv 2020; 96:752-754. [DOI: 10.1002/ccd.29297] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/14/2020] [Accepted: 09/16/2020] [Indexed: 11/05/2022]
Affiliation(s)
- Morton J. Kern
- Long Beach Veteran's Administration Medical Center Long Beach California
| | - Arnold H. Seto
- Long Beach Veteran's Administration Medical Center Long Beach California
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