Relationships among renal function loss within the normal to mildly impaired range, arterial stiffness, inflammation,...

Area of Science:

• Cardiovascular Health
• Nephrology
• Vascular Biology

Background:

• Mildly impaired renal function is common in middle-aged populations.
• The relationship between renal function decline and cardiovascular risk factors requires further elucidation.
• Arterial stiffness, microinflammation, and oxidative stress are potential mediators of cardiovascular risk.

Purpose of the Study:

• To investigate arterial stiffness, microinflammation, and oxidative stress in men with mildly impaired renal function compared to those with normal function.
• To examine the association between these parameters and the degree of Glomerular Filtration Rate (GFR) loss.
• To assess the role of these factors in cardiovascular risk among middle-aged Japanese men with low baseline cardiovascular risk.

Main Methods:

• Study population: 1873 middle-aged Japanese men (average age 42 years).
• Measurements: Brachial-ankle pulse wave velocity (arterial stiffness), plasma C-reactive protein (microinflammation), and plasma lipid peroxides (oxidative stress).
• Statistical analysis: Correlation and multivariate linear regression to assess relationships between GFR and measured parameters.

Main Results:

• Individuals with mildly impaired renal function exhibited increased brachial-ankle pulse wave velocity (arterial stiffness).
• Plasma levels of C-reactive protein and lipid peroxides were not significantly different between groups.
• GFR showed a significant correlation with brachial-ankle pulse wave velocity, independent of traditional cardiovascular risk factors.
• This association was significant even within the normal GFR range, suggesting GFR loss is more closely tied to arterial stiffness than inflammation or oxidative stress.

Conclusions:

• A significant relationship exists between Glomerular Filtration Rate (GFR) loss and arterial stiffness, even at GFR levels considered normal.
• Increased arterial stiffness may contribute to the elevated cardiovascular risk observed in individuals with mildly impaired renal function.
• These findings highlight the importance of monitoring arterial stiffness in individuals with declining kidney function to mitigate cardiovascular risks.