Ethnic differences in carotid and left ventricular hypertrophy.

Area of Science:

• Cardiovascular Medicine
• Vascular Biology
• Hypertension Research

Background:

• Afro-Caribbean populations exhibit higher hypertension prevalence and premature mortality than White Europeans.
• Left ventricular hypertrophy (LVH) is more common in Afro-Caribbeans, even with similar blood pressure levels.
• Carotid artery intima-media thickening (IMT) is an early marker of atherosclerosis, associated with LVH in White populations.

Purpose of the Study:

• To investigate if the relationship between carotid IMT and LVH differs between Afro-Caribbean and White European subjects.
• To compare carotid and femoral artery structure in matched Afro-Caribbean and White European individuals.

Main Methods:

• Carotid and femoral ultrasonography and echocardiography were used.
• Thirty-eight subjects (19 Afro-Caribbean, 19 White European) were matched for age, sex, and mean 24-hour systolic blood pressure.

Main Results:

• Afro-Caribbean subjects had significantly greater left ventricular mass index (LVMI) (136.4 vs. 112.4 g/m², P < 0.01).
• Carotid IMT, carotid diameter, femoral IMT, and femoral diameter were similar between the groups.
• Mean carotid IMT was 0.75 ± 0.02 mm in Afro-Caribbeans and 0.77 ± 0.04 mm in White Europeans.

Conclusions:

• Afro-Caribbean subjects have similar carotid and femoral IMT despite higher LVMI, compared to White Europeans at similar blood pressures.
• This indicates potential differences in cardiovascular risk stratification or target organ damage patterns in Afro-Caribbeans.
• Further research is needed to clarify the implications for cardiovascular risk in this population.