High-density lipoprotein cholesterol and longevity

Area of Science:

• Cardiology
• Gerontology
• Lipid Metabolism

Background:

• Serum lipid profiles, including total cholesterol, HDL cholesterol, and triglycerides, are critical indicators of cardiovascular health.
• Age-related changes in lipid metabolism and their association with cardiovascular disease (CVD) risk require further investigation.
• Understanding lipid profiles in diverse age groups and disease states is essential for risk stratification and management.

Purpose of the Study:

• To compare serum lipid profiles (total cholesterol, HDL cholesterol, triglycerides) across three distinct groups: healthy elderly individuals, younger adults without coronary artery disease (CAD), and patients with established triple-vessel disease.
• To investigate the prevalence of dyslipidemia in these groups and identify significant differences in lipid parameters.
• To assess the relationship between lipid levels, particularly HDL cholesterol, and the presence of severe coronary artery disease.

Main Methods:

• Cross-sectional study design comparing three participant groups: healthy elderly (85-89 years), younger adults without CAD (38-62 years), and patients with triple-vessel disease (32-69 years).
• Serum levels of total cholesterol, high-density lipoprotein (HDL) cholesterol, and triglycerides were measured.
• Coronary artery disease severity was determined by coronary angiography in the patient groups.

Main Results:

• Patients with triple-vessel disease exhibited significantly higher mean total cholesterol compared to those without CAD and the elderly group.
• While total cholesterol levels above 6.5 mmol/l showed a trend towards higher prevalence in the triple-vessel disease group, the difference was not statistically significant.
• HDL cholesterol and the HDL/total cholesterol ratio were significantly higher in the elderly group compared to both the younger adults without CAD and the triple-vessel disease patients.
• A high serum HDL cholesterol level (>1.0 mmol/l) was observed in 92% of the elderly, 69% of patients without CAD, and 46% of patients with triple-vessel disease, with significant differences between all groups.

Conclusions:

• The elderly population demonstrates a favorable lipid profile characterized by significantly higher high-density lipoprotein (HDL) cholesterol levels.
• Elevated HDL cholesterol in the elderly may contribute to their potentially lower risk or delayed onset of severe coronary artery disease despite age.
• These findings underscore the importance of HDL cholesterol as a protective factor against cardiovascular disease, even in advanced age.