Functional correlates of central arterial geometric phenotypes

Area of Science:

• Cardiovascular physiology
• Vascular biology
• Biomedical engineering

Background:

• Arterial geometry significantly influences cardiovascular health.
• Hypertension is associated with changes in vascular structure and function.
• Understanding carotid geometric phenotypes (CGPs) is crucial for assessing cardiovascular risk.

Purpose of the Study:

• To assess functional correlates of common carotid artery (CCA) geometry.
• To investigate CGPs in untreated hypertensive (HT) and normotensive (NT) individuals.
• To characterize the mechanical and functional properties of different CGPs.

Main Methods:

• Combined vascular mass (VM) and wall-to-lumen (W/L) ratio to define CGPs.
• Measured various hemodynamic parameters including pressures, CCA diameter, IMT, distensibility, wall stress, and pulse wave velocity.
• Categorized subjects into normal (CGP1) and deviant (CGP2, CGP3, CGP4) phenotypes.

Main Results:

• Prevalence: CGP1 (83.4%), CGP2 (5.5%), CGP3 (2.2%), CGP4 (8.9%).
• Deviant CGPs exhibited increased carotid resistance and higher CCA circumferential wall stress.
• CGP4 showed significantly increased central arterial pressures and the highest HT prevalence.

Conclusions:

• CGPs exhibit distinct mechanical and functional profiles, with normal CGP characterized by low wall stress and high FSS.
• Deviant CGPs are associated with increased wall stress and variable FSS, strain, and distensibility.
• The interplay of factors like wall stress and FSS likely determines CGP, which in turn modulates these forces.