Does sodium intake affect the relationship between blood pressure and vascular damage?

Area of Science:

• Cardiovascular Physiology
• Hypertension Research
• Vascular Biology

Background:

• Differences between central and peripheral blood pressure (BP) are known, but their clinical implications are emerging.
• A U-shaped relationship between sodium intake and cardiovascular risk has been proposed.

Purpose of the Study:

• To assess the correlation between intima-media thickness (IMT) and both central and peripheral BP.
• To investigate the influence of 24-hour urinary sodium excretion on the relationship between IMT and BP.

Main Methods:

• 182 subjects (mean age 37.3 years, 92 men) were recruited from randomly selected families in southern Poland.
• Measurements included peripheral and central BP (applanation tonometry), IMT, and 24-hour urinary sodium excretion.
• Statistical analyses were performed to evaluate correlations and multivariate relationships.

Main Results:

• Hypertension was prevalent in 44.5% of participants; mean sodium excretion was 243 ±81 mmol/d.
• Intima-media thickness (IMT) showed a stronger correlation with central pulse pressure (PP) (r=0.54) than peripheral PP (r=0.27).
• After adjustments, IMT remained linked to central systolic BP and central/peripheral PP, particularly in individuals with higher sodium excretion.

Conclusions:

• Central BP measurements are more closely correlated with IMT than peripheral BP.
• Sodium intake appears to modulate the association between central PP and IMT.
• Larger studies are warranted to validate these findings and explore the clinical significance.