An in Vitro Flow Model for Cardiovascular Inflammation

Area of Science:

• Biomedical Engineering
• Cardiovascular Research
• Fluid Dynamics

Background:

• Cardiovascular diseases (CVDs) are a leading cause of mortality and morbidity.
• Hemodynamics, particularly disturbed blood flow and shear stress, are implicated in CVD development, such as atherosclerosis.
• Understanding the relationship between hemodynamics and endothelial cell response is crucial for CVD research.

Purpose of the Study:

• To develop and characterize a simplified, in vitro, rigid flow model of a human aortic arch.
• To create an environment that mimics disturbed flow patterns and wall shear stress associated with cardiovascular disease.
• To enable the study of endothelial cell responses to specific hemodynamic conditions in regions prone to disease.

Main Methods:

• Construction of a real-size, rigid, in vitro model of an aortic arch.
• Culturing endothelial cells on the model's lumen.
• Characterization of the flow velocity field using particle image velocimetry (PIV).
• Estimation of wall shear stress in different regions of the model.

Main Results:

• The model successfully replicated attached flow at the outer curvature and separated, disturbed flow at the inner curvature.
• PIV analysis provided detailed flow velocity fields and enabled wall shear stress estimation.
• The model allows for the isolation of endothelial cells from regions with distinct hemodynamic conditions for biochemical analysis.

Conclusions:

• The developed aortic arch model provides a valuable platform for studying the biomechanical response of endothelial cells to specific hemodynamic forces.
• This in vitro model facilitates research into the mechanisms of cardiovascular disease initiation and progression.
• The ability to correlate hemodynamics with cellular responses aids in understanding disease pathogenesis and developing targeted therapies.