Feature | June 12, 2014

3-D Angiography Helps Identify Hidden Coronary Lesions

In symptomatic patients, 3D-QCA can help pinpoint potentially problematic blockages and reduce treatment variation

Charles Laham, M.D., FACC, FRCPC, FSCAI, principal investigator of the IQ-CATEGORIZE Lesions study

June 12, 2014 — Three-dimensional imaging known as 3-D quantitative coronary angiography (3D-QCA) accurately identifies hard-to-see coronary artery lesions that merit further evaluation, according to the IQ-CATEGORIZE Lesions study presented as a late-breaking clinical trial at the Society for Cardiovascular Angiography and Interventions (SCAI) 2014 scientific sessions in Las Vegas.

In patients with symptoms or tests suggestive of coronary artery disease but visibly underwhelming disease on angiography, variation in how the angiogram is interpreted can lead to wide variation in treatment and concerns of over- or under-treatment. This new study evaluates reliability of 3D-QCA as a simple tool to determine lesion severity.

Interventional cardiologists routinely use the caliber of the coronary catheter to determine stent size. In 3D-QCA, a 3-D image is created in a similar way, by using the catheter’s size in two or more angled views to create a proportionate 3-D image.

To evaluate 3D-QCA’s accuracy, researchers reviewed 131 suspicious lesions in 79 patients. They compared average minimum coronary channel (or luminal) diameter (MLD) from two angulated views to the in-lesion percent plaque area stenosis (%PAS), a proven and highly accurate measure taken by intravascular coronary ultrasound (IVUS), which uses an ultrasound catheter probe to view a blockage in cross section.

Prior studies using IVUS have established %PAS >67 percent in left main arteries and >70 percent in non-left main arteries as accurate measures of blockage severity. However, %PAS is less commonly used than other severity measures because it requires additional equipment to be passed down an artery. 3D-QCA has potential advantages, because its 3-D images are constructed using standard coronary angiogram images without need for additional imaging or equipment. 

In this study, researchers used a 6 French = 2 mm catheter severity cutoff for small (2.6-3.0 mm) and medium-sized (3.1-4.5 mm) vessels, and an 8 Fr or 2.67 mm cutoff for left main or large (>4.5 mm) vessels. They found average MLD’s less than the cutoffs measured by 3D-QCA were highly predictive of %PAS results. In small and medium vessels, 3D-QCA was highly accurate in predicting severe %PAS >70 percent, which is likely to indicate severe disease (93 percent accuracy in small vessels and 97 percent accuracy in medium vessels). In left main and large vessels, 3D-QCA reliably distinguished severe %PAS >67 percent and >70 percent (94 percent accuracy in left main and 92 percent accuracy in large vessels).

“In symptomatic patients, 3D-QCA using the cutoffs established in this study helps determine the location of relevant severe suspicious blockages that may warrant treatment,” said Charles Laham, M.D., FACC, FRCPC, FSCAI, principal investigator of the study. “3D-QCA appears to be a simple yet reliable tool to help interventional cardiologists distinguish which occult lesions should be further evaluated. The technique can help improve patient care, while reducing variation in care.”

For more information: www.scai.org

Related Content

biomimics, 3D stent
News | Peripheral Arterial Disease (PAD)| August 28, 2015
August 28, 2015 — PinnacleHealth CardioVascular Institute enrolled the first patient in Pennsylvania and second in th
iFR, FFR, Philips, Volcano
News | Cath Lab| August 28, 2015
August 28, 2015 — Philips Healthcare is showcasing its latest cardiology solutions at the European Society of Cardiol
News | Heart Failure| August 28, 2015
August 28, 2015 — BioControl Medical said it has completed enrollment in its INOVATE-HF (INcrease Of VAgal TonE in He
Stent graft, computational fluid dynamics, CFD, stent engineering

In this vector velocity model, brighter colors indicate blood flow acceleration as it passes through a bifurcation. Computation fluid dynamic modeling provides insight on blood flow through and near the walls of the stent graft. Image courtesy of Sanford Health

News | Cath Lab| August 27, 2015
August 27, 2015 — The use of computational fluid dynamics (CFD) modeling has been used for years to better engineer l
News | Cath Lab| August 26, 2015
August 26, 2014 — The Cardiovascular Research Foundation (CRF) announced the late-breaking trials and first report in

Mitral regurgitation viewed under color Doppler. Image courtesy of Toshiba.

Feature | Heart Valve Repair| August 26, 2015
August 25, 2015 — Medtronic announced it entered a definitive agreement to acquire Twelve Inc., a start–up medical de
NuCART, CompView Medical, mobile boom system, cath lab, hybrid OR
Technology | Cath Lab| August 21, 2015
August 21, 2015 — CompView Medical announced the release of the NuCART, a turn-key, all-in-one mobile boom system wit
Corindus, Corpath, radiation dose monitoring, cath lab, vascular robotic system

The Corindus Corpath vascular robotic system.

Technology | Radiation Dose Management| August 19, 2015
Corindus Vascular Robotics Inc. and Unfors RaySafe Inc., a Fluke Biomedical Company, announced a distribution agreement...
Sunshine Heart, COUNTER HF pivotal study, resumes enrollment, C-Pulse, FDA
News | Heart Failure| August 18, 2015
Sunshine Heart Inc. announced an update in late July on its COUNTER HF U.S. pivotal study for the C-Pulse Heart Assist...
corpath, corindus, robotic PCI, robots in the cath lab

The Corindus CorPath robotic system enables precise catheter manipulation in PCI procedures outside of the the radiation field. Buffalo General Medical Center, Buffalo, N.Y

Feature | Robotic Systems| August 17, 2015 | Dave Fornell
In the current healthcare economic climate of evaluating “nice vs.
Overlay Init