Relationship between Coronary Arterial Geometry and the Presence and Extend of Atherosclerotic Plaque Burden: A Review Discussing Methodology and Findings in the Era of Cardiac Computed Tomography Angiography

Georgios Rampidis, Vasileios Rafailidis, Konstantinos Kouskouras, Andjoli Davidhi, Angeliki Papachristodoulou, Athanasios Samaras, George Giannakoulas, Antonios Ziakas, Panagiotis Prassopoulos, Haralambos Karvounis, Georgios Rampidis, Vasileios Rafailidis, Konstantinos Kouskouras, Andjoli Davidhi, Angeliki Papachristodoulou, Athanasios Samaras, George Giannakoulas, Antonios Ziakas, Panagiotis Prassopoulos, Haralambos Karvounis

Abstract

Coronary artery disease (CAD) represents a modern pandemic associated with significant morbidity and mortality. The multi-faceted pathogenesis of this entity has long been investigated, highlighting the contribution of systemic factors such as hyperlipidemia and hypertension. Nevertheless, recent research has drawn attention to the importance of geometrical features of coronary vasculature on the complexity and vulnerability of coronary atherosclerosis. Various parameters have been investigated so far, including vessel-length, coronary artery volume index, cross-sectional area, curvature, and tortuosity, using primarily invasive coronary angiography (ICA) and recently non-invasive cardiac computed tomography angiography (CCTA). It is clear that there is correlation between geometrical parameters and both the haemodynamic alterations augmenting the atherosclerosis-prone environment and the extent of plaque burden. The purpose of this review is to discuss the currently available literature regarding this issue and propose a potential non-invasive imaging biomarker, the geometric risk score, which could be of importance to allow the early detection of individuals at increased risk of developing CAD.

Keywords: atherosclerosis; cardiac CT; coronary; geometry.

Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
Blood flow patterns, levels of shear stress, and their effects on atherosclerosis. ESS, endothelial shear stress.
Figure 2
Figure 2
GEOMETRY-CTA study design (ClinicalTrials.gov ID: NCT04185493).
Figure 3
Figure 3
Volume-rendering (VRT) and multiplanar reconstruction (MPR) techniques used to measure the bifurcation angle between LAD and LCx in a 67-year-old woman with mild non-obstructive coronary artery disease.

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