Arterial mechanical changes in children with familial hypercholesterolemia

Area of Science:

• Cardiovascular Medicine
• Pediatric Cardiology
• Biomedical Engineering

Background:

• Atherosclerosis development involves arterial wall changes preceding clinical manifestations.
• Early detection of arterial wall alterations is crucial for predicting cardiovascular risk.

Purpose of the Study:

• To investigate early mechanical property changes in the common carotid artery (CCA) of children with familial hypercholesterolemia (FH).
• To assess if these mechanical alterations precede clinical and echographic modifications and correlate with endothelial function.

Main Methods:

• Utilized computerized ultrasound to measure CCA geometry and mechanical properties (compliance, distensibility, elastic modulus) in children with FH and controls.
• Assessed brachial artery endothelium-dependent (reactive hyperemia) and independent (glyceryltrinitrate) dilation.
• Correlated CCA mechanical properties with intima-media thickness (IMT) and lipid levels.

Main Results:

• Children with FH exhibited reduced CCA systodiastolic diameter variations, decreased compliance and distensibility, and increased incremental elastic modulus.
• No significant difference in CCA intima-media thickness (IMT) was observed between groups.
• Flow-mediated dilation of the brachial artery was significantly reduced in FH subjects, correlating negatively with LDL cholesterol.

Conclusions:

• Increased CCA stiffness in children with FH is independent of blood pressure and linked to endothelial dysfunction.
• Early alterations in CCA wall mechanics are measurable and may serve as preclinical markers for atherosclerosis.