[Development of coronary atherosclerosis in the elderly]

Area of Science:

• Gerontology
• Cardiovascular Medicine
• Pathology

Background:

• Coronary atherosclerosis is a significant health concern in the elderly.
• Aging, hypertension, and hypercholesterolemia are suspected contributors to its development.

Purpose of the Study:

• To investigate the roles of aging, hypertension, and plasma cholesterol in coronary atherosclerosis.
• To characterize the cellular effects of hypertension on vascular endothelial cells.

Main Methods:

• Analysis of 3569 autopsy cases (aged 60-99) from Tokyo Metropolitan Geriatric Hospital.
• Correlational analysis of age, blood pressure, plasma cholesterol levels, and coronary atherosclerosis prevalence.
• In vitro characterization of endothelial cell calcium responses in spontaneously hypertensive rats (SHR) versus Wistar-Kyoto rats (WKY).

Main Results:

• Coronary atherosclerosis prevalence increased with age.
• Both systolic and diastolic hypertension were associated with higher prevalence.
• High plasma cholesterol (≥230 mg/dl) correlated with increased atherosclerosis, particularly in hypertensive individuals.
• Endothelial cells from SHR showed enhanced cellular calcium (Ca2+) response compared to WKY rats.

Conclusions:

• Aging, hypertension, and high plasma cholesterol are confirmed risk factors for coronary artery atherosclerosis in the elderly.
• Hypertension may exacerbate atherosclerosis through mechanisms involving endothelial cell dysfunction.
• These findings underscore the importance of managing hypertension and cholesterol in preventing cardiovascular disease in older populations.