Age-related changes in vascular responses: a review

Area of Science:

• Cardiovascular Physiology
• Gerontology
• Vascular Biology

Background:

• Normal aging involves progressive cardiovascular system changes, elevating risks for hypertension, coronary artery disease, and heart failure.
• Vascular alterations include arterial structural and functional modifications, increased stiffness, and lipid/collagen accumulation, particularly with atherosclerosis.
• Reduced cerebral perfusion in the elderly can lead to cognitive decline, exacerbated by hypertension.

Purpose of the Study:

• To elucidate the multifaceted cardiovascular and vascular changes associated with normal aging.
• To investigate the impact of aging on endothelial cell function and vascular tone regulation.
• To analyze alterations in vascular reactivity to various agonists and the role of calcium regulation.

Main Methods:

• Review and synthesis of existing literature on age-related cardiovascular and vascular changes.
• Analysis of functional alterations in arteries, including endothelial-dependent and independent relaxations.
• Examination of changes in vascular smooth muscle contractility and receptor sensitivity.

Main Results:

• Aging reduces endothelium-dependent relaxations and beta-adrenoceptor agonist-induced vasodilation.
• Contractile responses to some agents are reduced (noradrenaline, endothelin), while others are unaffected (histamine, potassium).
• Increased plasma noradrenaline levels and altered vascular calcium regulation are observed in senescence.

Conclusions:

• Aging profoundly impacts cardiovascular health, increasing susceptibility to pathological conditions and functional decline.
• Vascular endothelial dysfunction and altered smooth muscle responsiveness contribute significantly to age-related cardiovascular changes.
• Understanding these vascular alterations is crucial for managing age-related cardiovascular diseases and improving geriatric health outcomes.