Low wall shear stress in carotid arteries in subjects with left ventricular hypertrophy

Area of Science:

• Cardiovascular Medicine
• Biomedical Engineering
• Atherosclerosis Research

Background:

• Left ventricular hypertrophy (LVH) is a known risk factor for cardiovascular complications, including atherosclerosis.
• The relationship between LVH and carotid atherosclerosis is established, but the underlying mechanisms remain unclear.
• Low wall shear stress is implicated as a local factor in intimal thickening and atherosclerosis development.

Purpose of the Study:

• To investigate the relationship between wall shear stress and LVH in individuals with atherosclerosis risk factors.
• To determine if reduced wall shear stress is associated with LVH in this population.

Main Methods:

• Eighty subjects with at least one atherosclerosis risk factor (hypertension, diabetes, hyperlipidemia, smoking) were enrolled.
• Common carotid artery intimal-medial thickness (IMT), plaque count, dimensions, and blood flow velocity were measured.
• Wall shear stress was calculated using a validated Poiseuillean model, and subjects were grouped by LVH status based on LVMI.

Main Results:

• Subjects with LVH exhibited significantly lower mean and peak systolic wall shear stress compared to those without LVH.
• Mean shear stress showed a significant inverse correlation with LVMI (r = -0.42, P < .0001).
• Peak shear stress also inversely correlated with LVMI (r = -0.31, P < 0.01), and wall shear stress independently correlated with both LVMI and IMT.

Conclusions:

• Low wall shear stress is associated with left ventricular hypertrophy in individuals at risk for atherosclerosis.
• Reduced wall shear stress may act as a local contributing factor to atherosclerosis development in the presence of LVH.
• These findings highlight a potential mechanism linking LVH and carotid atherosclerosis.