Feature | Computed Tomography (CT) | May 29, 2018

SYNTAX III Revolution Trial Shows CT-FFR Could Replace Cine-angiography in Coming Years

SYNTAX III Revolution data showed noninvasive FFR-CT assessment of multivessel coronary disease aids decision making and may dawn a new era in noninvasive decision making

FFR-CT may soon replace invasive angiography for coronary lesion assessment. #EuroPCR 

Anexample of a clinical case of CT-FFR, which can derive the FFR numbers for their entire coronary tree using a noninvasive CT scan.

FFR-CT may soon replace invasive angiography for coronary lesion assessment. #EuroPCR 

An illustration of CT-FFR, which can derive the FFR numbers for their entire coronary tree using a noninvasive CT scan.

May 29, 2018 — Results from the innovative SYNTAX III Revolution Trial [1] underline the effectiveness of evolving noninvasive algorithms for fractional flow reserve assessed through computed tomography (FFR-CT) imaging. The data suggests heart teams should use this imaging-based technology for decision making. The data was presented as a late-breaking study at EuroPCR 2018.   

“Designed to better understand the heart team decision-making process itself, the SYNTAX III Revolution clinical Trial was distinctive among clinical trials," said Study Chairman Professor Patrick W. Serruys, M.D. "Rather than randomizing the patient, it was the doctors themselves who were randomized — in this case the heart team – in order to understand more completely the present and future role of noninvasive assessments in deciding and planning revascularization strategies.”

Watch a VIDEO interview with Serruys "Will CT-FFR Replace Diagnostic Angiograms?" regarding the SYNTAX III results.

The SYNTAX III Revolution trial was specifically designed to provide evidence in decision making by randomizing two heart teams in six participating international centers. These teams, composed of a surgeon, an interventional cardiologist and a radiologist, considered the treatment of 223 patients over an 18-month period.

Each of the two heart teams was presented with the same patient and asked to plan a procedure, answering several questions. These include: Which vessels need to be revascularized? How many bypasses are needed? How many stents should be used? The primary goal was to assess the treatment decision, whether it was decided based on the information received, to go with either surgery (CABG) or PCI.

Heart Team A had to make its decision on whether to perform revascularization with either PCI or surgery using information received strictly from noninvasive means using multi-slice coronary computed tomography angiography (MSCT) from a GE Revolution scanner that included CT-FFR assessment using HeartFlow software.

Heart Team B needed to make the same decision but using only conventional, invasive, cine-angiography.

The Cohen’s kappa statistic was employed to indicate the level of agreement between the two heart teams in terms of their treatment decision — in this case to use either CABG or PCI – based on the CT-first assessment or angiography-first evaluation.

“We were looking at the concordance of judgement and the concordance of opinion in the planning of the procedure and discovered that the Cohen’s kappa statistic was very high – 0.82 – which can be called an almost perfect assessment/agreement," Serruys said. He said it showed good agreement as well in terms of the number of bypasses, how many stents should be used and the location in the coronary circulation.

“We were amazed to hear participating surgeons telling us that they could see more things on the GE Revolution multi-slice scan than using conventional angiography,” Serruys continued. “Cine-angiography could be dispensed with completely and only the noninvasive multislice scans used.” 

In the initial trial, in order to ensure patient safety, the actual procedure remained “virtual”. After each blinded heart team made its decision and planned for surgery or PCI – and before the actual intervention took place. The different teams were unblinded and provided with all the information acquired by both the MSCT-first assessment and angiography-first examination before actually continuing with the procedure. 

In January 2018, preparing for the next step, a meeting was organized with the surgeons of the six centers where they were presented with randomized cases and asked if they could plan an operation using the GE multislice scan alone. “To our surprise,” Serruys said, “there was a very high feeling of feasibility among the surgeons.” The next phase, planned for 2018-2019, will be a first-in-man trial asking surgeons to treat 100 patients based on multislice CT scan alone without looking at coronary angiography.

“In the next five to 10 years, with its increasing accuracy, I think we are going to see the new generation of multislice CT scans replacing conventional cine-angiography," Serruys explained. "For interventional cardiologists this is a bonus, allowing them to have the image before bringing the patient to the cath lab and being able to make a decision concerning whether it is a one-vessel or multivessel disease. If it is clearly one-vessel disease, there is no reason to consider surgery, but, when you know in advance that it is a multivessel disease, you can immediately discuss with the surgeon based on the non-invasive imaging alone and go immediately to the operating room or the interventional suite to perform the intervention, So, this can be seen as promising a real change in our practice. It will take time and it will take multiple trials, but the impetus is there to go in this direction. It is clearly the beginning of a trend we will see in the next few years."

The SYNTAX III trial is an investigator-driven study sponsored by the European Cardiovascular Research Institute (ECRI). For this study, the ECRI received research grants from GE Healthcare and HeartFlow Inc.

Links to other 2018 EuroPCR late-breaking trials


Related FFR-CT Content:

What is New in FFR Technology

Clinical Applications of FFR-CT

VIDEO: The Status FFR-CT Adoption in the United States

New Technology Supports CT as Prime Cardiac Imaging Modality




1. Cavalcante R, Onuma Y, Sotomi Y, et al. Non-invasive Heart Team assessment of multivessel coronary disease with coronary computed tomography angiography based on SYNTAX score II treatment recommendations: design and rationale of the randomised SYNTAX III Revolution trial. EuroIntervention. 2017 Mar 20;12(16):2001-2008. doi: 10.4244/EIJ-D-16-00612.

Related Content

Johns Hopkins Medicine First in U.S. to Install Canon Medical's Aquilion Precision
News | Computed Tomography (CT) | March 26, 2019
Johns Hopkins Medicine now has access to the first Ultra-High Resolution computed tomography (UHR CT) system for...
Siemens Healthineers Debuts Cardiovascular Edition of Somatom go.Top CT
News | Computed Tomography (CT) | March 14, 2019
Siemens Healthineers will introduce the Somatom go.Top Cardiovascular Edition, a new version of its established...
Canon Medical Introduces Deep Learning-Based CT Image Reconstruction
News | Computed Tomography (CT) | February 27, 2019
Canon Medical Systems recently introduced AiCE (Advanced intelligent Clear IQ Engine), a deep convolutional neural...
SCCT Releases New Guideline for CT Use During TAVR
News | Computed Tomography (CT) | January 08, 2019
The Society of Cardiovascular Computed Tomography (SCCT) has released a new expert consensus document for computed...
A CT calcium scoring image showing calcified plaques in coronary vessel segments. The higher the calcium content of the vessels, the high risk the patient is for a heart attack event. CAC exam

A CT calcium scoring image showing calcified plaques in coronary vessel segments. The higher the calcium content of the vessels, the higher risk the patient is for a heart attack event. Image courtesy of Canon Medical Systems.

Feature | Computed Tomography (CT) | October 17, 2018 | Dave Fornell, Editor
A picture is worth a thousand words, and to patients concerned about their health, detailed images of the coronary an
Abdominal Aortic Calcification May Signal Future Heart Attack

Image from computed tomography (CT) colonography shows segmented abdominal aortic calcification measured with semiautomated CT tool on coronal image. Within region of interest over aorta selected by user, tool automatically segments and quantifies aortic calcification (shown in blue). 

Image Credit: O’Connor S D, Graffy P M, Zea R, et al. Does nonenhanced CT-based quantification of abdominal aortic calcification outperform the Framingham Risk Score in predicting cardiovascular event sin asymptomatic adults? Radiology doi: 10.1148/radiol.2018180562. Published online Oct. 2, 2018. © RSNA.

News | Computed Tomography (CT) | October 12, 2018
Computed tomography (CT)-based measures of calcification in the abdominal aorta are strong predictors of heart attacks...
Siemens Healthineers Announces First U.S. Install of Somatom go.Top CT
News | Computed Tomography (CT) | September 17, 2018
September 17, 2018 — The Ohio State University Wexner Medical Center in Columbus recently became the first healthcare
Key Patient Preparations for a CT Scan
News | Computed Tomography (CT) | September 05, 2018
The Center for Diagnostic Imaging (CDI) in Miami recently released a list of important preparations patients should...
Overlay Init