Morphometry and hemodynamics of coronary artery aneurysms caused by atherosclerosis

Area of Science:

• Cardiovascular research
• Medical imaging analysis
• Biomechanical engineering

Background:

• Atherosclerosis is the primary cause of coronary artery aneurysms (CAAs), posing challenges in preventing their development.
• Understanding the morphometric and hemodynamic factors contributing to CAA is crucial for risk assessment.

Purpose of the Study:

• To conduct morphometric and hemodynamic analyses of epicardial coronary arteries in patients with atherosclerosis-induced CAAs.
• To develop and validate a novel two-step analysis method for enhanced CAA risk stratification.

Main Methods:

• Reconstruction of epicardial coronary arterial trees from 61 patients.
• Determination of morphometric and hemodynamic parameters using computed flow fields.
• Implementation of a two-step analysis prioritizing coronary artery bifurcation and aneurysm shape index (L/W).

Main Results:

• Coronary artery bifurcations are identified as a major risk factor for CAA, followed by a high aneurysm shape index (L/W).
• Patients with CAAs covering bifurcations exhibit a higher incidence of myocardial ischemia (71% vs. 43% for L/W ≥ 2) compared to those with CAAs in single vessels.
• CAAs with L/W ≥ 2 at bifurcations present the most adverse hemodynamic environment.

Conclusions:

• Morphometric and hemodynamic findings support the proposed two-step analysis method for CAA risk assessment.
• This approach offers a clinical rationale for noninvasive evaluation of coronary artery aneurysms.