Cholesterol and coronary artery disease: age as an effect modifier

Area of Science:

• Cardiovascular Medicine
• Epidemiology
• Gerontology

Background:

• Elevated serum cholesterol is a recognized risk factor for coronary heart disease (CHD).
• Current screening guidelines apply universal cutpoints for hypercholesterolemia across all adult age groups.
• There is debate regarding the predictive value of cholesterol for CHD risk in the elderly.

Purpose of the Study:

• To investigate the association between plasma cholesterol levels and coronary artery occlusion in men across different age strata.
• To determine if the predictive value of cholesterol for coronary artery disease (CAD) varies significantly with age.

Main Methods:

• Analysis of data from 2544 white men undergoing coronary angiography.
• Stratification of participants by age groups (25-84 years).
• Utilized multivariable linear regression to assess the interaction between cholesterol levels and age in predicting CAD.

Main Results:

• A significant association was observed between plasma cholesterol levels and coronary artery occlusion in the overall cohort (rs = 0.15, p < 0.01).
• This association was significant only in younger men, diminishing to near zero in the oldest age group.
• A highly significant negative interaction between cholesterol levels and age was found in predicting CAD (p < 0.001).

Conclusions:

• Plasma cholesterol levels are substantially less predictive of coronary artery disease in the elderly compared to younger individuals.
• The findings underscore the need for age-adjusted criteria in evaluating hypercholesterolemia to improve risk assessment accuracy.
• Current universal screening cutpoints may not be optimal for identifying CHD risk in older male populations.