Related Experiment Video
Updated: Sep 25, 2025
Evaluation of Coronary Flow Reserve After Myocardial Ischemia Reperfusion in Rats
Published on: June 28, 2019
Effect of the Coronary Arterial Diameter Derived From Coronary Computed Tomography Angiography on Fractional Flow
Jincheng Liu1, Suqin Huang1, Xue Wang1
1From the Department of Biomedical Engineering, Faculty of Environment and Life, Beijing University of Technology.
Insights
Larger coronary artery diameters with increased stenosis are more prone to ischemia than smaller ones. This finding impacts the diagnosis of functional myocardial ischemia using coronary computed tomography angiography.
Area of Science:
- Cardiovascular Imaging
- Medical Devices and Instrumentation
- Computational Fluid Dynamics
Background:
- Fractional flow reserve (FFR) is the gold standard for diagnosing functional myocardial ischemia.
- Coronary computed tomography angiography (CCTA) provides anatomical information, but its impact on FFR requires further investigation.
- Understanding the relationship between coronary arterial diameter and FFR is crucial for accurate ischemia assessment.
Purpose of the Study:
- To investigate the influence of coronary arterial diameter on FFR values derived from CCTA.
- To compare the FFRCT in stenotic vessels of different diameters and stenosis degrees.
- To explore the effect of cardiac output variations on FFRCT in different vessel diameters.
Main Methods:
- Retrospective analysis of 131 patients with moderate coronary artery stenosis.
- Creation of 8 idealized coronary artery models (3mm and 4mm diameters with 40-70% stenosis).
- Numerical simulations to assess FFRCT variations with vessel diameter, stenosis, and cardiac output.
Main Results:
- Ischemic group had significantly larger stenotic vessel diameters (3.67 ± 0.77 mm) than the non-ischemic group (3.31 ± 0.64 mm).
- Lower FFRCT values were observed in larger diameter vessels (4mm) compared to smaller ones (3mm) across various stenosis levels.
- Increased cardiac output led to lower FFRCT values in both 3mm and 4mm diameter vessels, with greater changes in the 4mm diameter.
Conclusions:
- Larger diameter stenotic coronary arteries exhibit greater flow rate changes and are more susceptible to ischemia compared to smaller diameter vessels.
- Coronary arterial diameter is a significant factor influencing FFRCT calculations.
- These findings highlight the importance of considering vessel diameter in the interpretation of CCTA-derived FFR for diagnosing myocardial ischemia.
Background:
Fractional flow reserve (FFR) is considered to be the criterion standard for the clinical diagnosis of functional myocardial ischemia. In this study, we explored the effect of the coronary arterial diameter derived from coronary computed tomography angiography on FFR.
Method:
We retrospectively reviewed the clinical information of 131 patients with moderate coronary artery stenosis. To compare the mean diameter of stenotic vessels, patients were divided into ischemic and nonischemic groups. According to the clinical statistics of the diameter of the ischemic group and the nonischemic group, we established 8 ideal models of coronary artery diameter of 4 mm (40%, 50%, 60%, and 70% stenosis) and diameter of 3 mm (40%, 50%, 60%, and 70% stenosis). Two sets of numerical simulation experiments were carried out: experiment 1 evaluated the variation rate of CT-based computation of non-invasive fractional flow reserve (FFRCT) with vessel diameters of 4 mm and 3 mm under different stenosis rates, and experiment 2 explored the variation of FFRCT with vessel diameters of 4 mm and 3 mm under different cardiac outputs. We simulated changes in the flow of narrow blood vessels by changes in cardiac output.
Results:
According to clinical statistics, the mean ± SD diameter of stenotic vessels in the ischemic and nonischemic groups was 3.67 ± 0.77 mm and 3.31 ± 0.64 mm (P < 0.05 for difference), respectively. In experiment 1, the FFRCT of coronary with a diameter of 4 mm was 0.86, 0.80, 0.66, and 0.35, and that with a diameter of 3 mm was 0.90, 0.84, 0.71, and 0.50, respectively. In experiment 2, the FFRCT of the coronary vessel diameter of 4 mm was 0.84, 0.80, 0.76, and 0.72, respectively. The FFRCT coronary vessels with a diameter of 3 mm were 0.87, 0.84, 0.80, and 0.76, respectively.
Conclusions:
As the stenosis increases, compared with narrow blood vessel of small diameter, the narrow blood vessel with larger diameter is accompanied by faster flow rate changes and is more prone to ischemia.
More Related Videos
05:07Author Spotlight: Improved Localization and Monitoring of Coronary Flow Reserve Using Modified PLAX View in Mice
Published on: August 25, 2023
06:39Ultrasound Based Assessment of Coronary Artery Flow and Coronary Flow Reserve Using the Pressure Overload Model in Mice
Published on: April 13, 2015