Age-Related Alterations of Cerebral Autoregulation

Area of Science:

• Neuroscience
• Cardiovascular Science
• Gerontology

Background:

• Intact cerebral blood flow (CBF) regulation is crucial for cognitive function and preventing cerebrovascular events, especially in aging individuals.
• Cerebral autoregulation maintains stable brain perfusion against blood pressure changes and protects the microvasculature from damage.
• Aging and disease can attenuate this protective mechanism, leading to microvascular damage, blood-brain barrier (BBB) disruption, and cerebral small vessel disease.

Purpose of the Study:

• To review the current understanding of how aging impacts cerebral autoregulation.
• To highlight the underlying mechanisms contributing to age-related changes in CBF regulation.
• To discuss the clinical consequences and potential strategies for preserving cerebrovascular health in older adults.

Main Methods:

• This mini-review synthesizes existing research on aging and cerebral autoregulation.
• It examines the physiological mechanisms involved in maintaining stable CBF.
• The review discusses clinical outcomes associated with impaired autoregulation in aging.

Main Results:

• Aging is associated with a decline in the effectiveness of cerebral autoregulation.
• This impairment increases the brain's susceptibility to pressure fluctuations and pulsatility.
• Consequences include structural microvascular damage, BBB dysfunction, and the progression of small vessel disease.

Conclusions:

• Impaired cerebral autoregulation due to aging poses significant risks to brain health.
• Understanding these mechanisms is vital for developing interventions.
• Strategies to preserve cerebrovascular function are needed to mitigate cognitive decline and cerebrovascular events in the elderly.