1
|
Rajiah P, Cummings KW, Williamson E, Young PM. CT Fractional Flow Reserve: A Practical Guide to Application, Interpretation, and Problem Solving. Radiographics 2022; 42:340-358. [PMID: 35119968 DOI: 10.1148/rg.210097] [Citation(s) in RCA: 13] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
CT fractional flow reserve (FFRCT) is a physiologic simulation technique that models coronary flow from routine coronary CT angiography (CTA). To evaluate lesion-specific ischemia, FFRCT is measured 2 cm distal to a stenotic lesion. FFRCT greater than 0.8 is normal, 0.76-0.8 is borderline, and 0.75 or less is abnormal. FFRCT should always be interpreted in correlation with clinical and anatomic coronary CTA findings. FFRCT increases the specificity of coronary CTA in the evaluation of coronary artery disease, decreases the prevalence of nonobstructive disease in invasive coronary angiography (ICA), and helps with revascularization decisions and planning. Patients with intermediate-risk coronary anatomy at CTA and abnormal FFRCT can undergo ICA and revascularization, whereas those with normal FFRCT can be safely deferred from ICA. In borderline FFRCT values, management is decided in the context of the clinical scenario, but many cases could be safely managed with medical treatment. There are some limitations and pitfalls of FFRCT. Abnormal FFRCT values can be seen in mild stenosis, and normal FFRCTvalues can be seen in severe stenosis. Gradually decreasing or abnormal low FFRCT values at the distal vessel without a proximal focal lesion could be due to diffuse atherosclerosis. Coronary stents, bypass grafts, coronary anomalies, coronary dissection, transcatheter aortic valve replacement, unstable angina, and acute or recent myocardial infarction are situations in which FFRCT has not been validated and should not be used at this time. The authors provide a practical guide to the applications and interpretation of FFRCT, focusing on common pitfalls and challenges. Online supplemental material is available for this article. ©RSNA, 2022.
Collapse
Affiliation(s)
- Prabhakar Rajiah
- From the Department of Radiology, Mayo Clinic, 200 1st St SW, Rochester, MN 55905 (P.R., E.W., P.M.Y.); and Department of Radiology, Mayo Clinic, Phoenix, Ariz (K.W.C.)
| | - Kristopher W Cummings
- From the Department of Radiology, Mayo Clinic, 200 1st St SW, Rochester, MN 55905 (P.R., E.W., P.M.Y.); and Department of Radiology, Mayo Clinic, Phoenix, Ariz (K.W.C.)
| | - Eric Williamson
- From the Department of Radiology, Mayo Clinic, 200 1st St SW, Rochester, MN 55905 (P.R., E.W., P.M.Y.); and Department of Radiology, Mayo Clinic, Phoenix, Ariz (K.W.C.)
| | - Phillip M Young
- From the Department of Radiology, Mayo Clinic, 200 1st St SW, Rochester, MN 55905 (P.R., E.W., P.M.Y.); and Department of Radiology, Mayo Clinic, Phoenix, Ariz (K.W.C.)
| |
Collapse
|
2
|
Nørgaard BL, Gaur S, Fairbairn TA, Douglas PS, Jensen JM, Patel MR, Ihdayhid AR, Ko BSH, Sellers SL, Weir-McCall J, Matsuo H, Sand NPR, Øvrehus KA, Rogers C, Mullen S, Nieman K, Parner E, Leipsic J, Abdulla J. Prognostic value of coronary computed tomography angiographic derived fractional flow reserve: a systematic review and meta-analysis. Heart 2021; 108:194-202. [PMID: 34686567 PMCID: PMC8762006 DOI: 10.1136/heartjnl-2021-319773] [Citation(s) in RCA: 36] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/28/2021] [Accepted: 09/23/2021] [Indexed: 12/18/2022] Open
Abstract
Objectives To obtain more powerful assessment of the prognostic value of fractional flow reserveCT testing we performed a systematic literature review and collaborative meta-analysis of studies that assessed clinical outcomes of CT-derived calculation of FFR (FFRCT) (HeartFlow) analysis in patients with stable coronary artery disease (CAD). Methods We searched PubMed and Web of Science electronic databases for published studies that evaluated clinical outcomes following fractional flow reserveCT testing between 1 January 2010 and 31 December 2020. The primary endpoint was defined as ‘all-cause mortality (ACM) or myocardial infarction (MI)’ at 12-month follow-up. Exploratory analyses were performed using major adverse cardiovascular events (MACEs, ACM+MI+unplanned revascularisation), ACM, MI, spontaneous MI or unplanned (>3 months) revascularisation as the endpoint. Results Five studies were identified including a total of 5460 patients eligible for meta-analyses. The primary endpoint occurred in 60 (1.1%) patients, 0.6% (13/2126) with FFRCT>0.80% and 1.4% (47/3334) with FFRCT ≤0.80 (relative risk (RR) 2.31 (95% CI 1.29 to 4.13), p=0.005). Likewise, MACE, MI, spontaneous MI or unplanned revascularisation occurred more frequently in patients with FFRCT ≤0.80 versus patients with FFRCT >0.80. Each 0.10-unit FFRCT reduction was associated with a greater risk of the primary endpoint (RR 1.67 (95% CI 1.47 to 1.87), p<0.001). Conclusions The 12-month outcomes in patients with stable CAD show low rates of events in those with a negative FFRCT result, and lower risk of an unfavourable outcome in patients with a negative test result compared with patients with a positive test result. Moreover, the FFRCT numerical value was inversely associated with outcomes.
Collapse
Affiliation(s)
| | - Sara Gaur
- Cardiology, Aarhus University Hospital, Aarhus, Denmark
| | | | | | | | | | | | - Brian S H Ko
- Cardiology, MonashHeart, Melbourne, Victoria, Australia
| | | | | | | | - Niels Peter R Sand
- Institute of Regional Health Services Research, University of Southern Denmark, Esbjerg, Denmark
| | | | | | | | - Koen Nieman
- Cardiology, Stanford University Hospital, Palo Alto, California, USA
| | - Erik Parner
- Department of Public Health, Aarhus Universitet Health, Aarhus, Denmark
| | - Jonathon Leipsic
- Radiology, St Pauls Hospital, Vancouver, British Columbia, Canada
| | - Jawdat Abdulla
- Cardiology, Glostrup University Hospital, Glostrup, Denmark
| |
Collapse
|
3
|
Westra J, Tu S, Campo G, Qiao S, Matsuo H, Qu X, Koltowski L, Chang Y, Liu T, Yang J, Andersen BK, Eftekhari A, Christiansen EH, Escaned J, Wijns W, Xu B, Holm NR. Diagnostic performance of quantitative flow ratio in prospectively enrolled patients: An individual patient‐data meta‐analysis. Catheter Cardiovasc Interv 2019; 94:693-701. [PMID: 30963676 DOI: 10.1002/ccd.28283] [Citation(s) in RCA: 74] [Impact Index Per Article: 14.8] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/16/2019] [Accepted: 03/29/2019] [Indexed: 12/28/2022]
Affiliation(s)
- Jelmer Westra
- Department of Cardiology, Aarhus University Hospital, Skejby, Denmark
| | - Shengxian Tu
- School of Biomedical Engineering, Shanghai Jiao Tong University, Shanghai, China
| | - Gianluca Campo
- Cardiovascular Institute, Azienda Ospedaliero-Universitaria di Ferrara, Cona (FE), Italy
- Maria Cecilia Hospital, GVM Care & Research, Cotignola (RA), Italy
| | - Shubin Qiao
- Fu Wai Hospital, National Center for Cardiovascular Diseases, Chinese Academy of Medical Sciences, Beijing, China
| | - Hitoshi Matsuo
- Department of Cardiovascular Medicine, Gifu Heart Center, Gifu City, Japan
| | - Xinkai Qu
- Huadong Hospital Affiliated to Fudan University, Shanghai, China
| | - Lukasz Koltowski
- 1st Department of Cardiology, Medical University of Warsaw, Warsaw, Poland
| | - Yunxiao Chang
- School of Biomedical Engineering, Shanghai Jiao Tong University, Shanghai, China
| | - Tommy Liu
- Department of Cardiology, Hagaziekenhuis, The Hague, The Netherlands
| | | | | | - Ashkan Eftekhari
- Department of Cardiology, Aarhus University Hospital, Skejby, Denmark
| | | | - Javier Escaned
- Department of Cardiology, Hospital Clinico San Carlos, Madrid, Spain
| | - William Wijns
- The Lambe Institute for Translational Medicine and Curam, National University of Ireland Galway, Ireland
| | - Bo Xu
- Fu Wai Hospital, National Center for Cardiovascular Diseases, Chinese Academy of Medical Sciences, Beijing, China
| | | |
Collapse
|
4
|
Alzahrani T, Tashkandi A, Sarkar A, Smuclovisky C, Earls JP, Choi AD. Practical Clinical Application of Cardiac Computed Tomography‐Derived Fractional Flow Reserve. CARDIOVASCULAR INNOVATIONS AND APPLICATIONS 2019. [DOI: 10.15212/cvia.2019.0003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
|