Scientists from the University of Sheffield found that heart disease can directly cause brain dysfunction early on which could lead to dementia and can triple the amount of an Alzheimer’s protein in the brain.
They found that heart disease causes a breakdown of a key brain function that links brain activity and blood flow, meaning the brain gets less blood for the same amount of activity.
This is happening in heart disease patients before the build-up of fat in the brain’s blood vessels (atherosclerosis) and is a prelude to dementia.
The research is published in eLife and was conducted by Dr. Osman Shabir et al.
Alzheimer’s Disease is the most common form of dementia worldwide and heart disease is a major risk factor for both Alzheimer’s and dementia.
Until now it has been unclear how some forms of vascular dementia can happen years before atherosclerosis in the brain.
In the study, the team discovered that heart disease in midlife causes the breakdown of neurovascular coupling, an important mechanism in our brains that controls the amount of blood supplied to our neurons.
This breakdown means the brain doesn’t get enough oxygen when needed and in time this can lead to dementia.
The researchers also found that the combination of heart disease and a genetic predisposition for Alzheimer’s Disease trebles the amount of beta-amyloid, a protein that builds up and triggers Alzheimer’s, and increases the levels of an inflammatory gene (IL1) in the brain.
The team also found that brain injuries can also worsen brain blood flow regulation, supporting observations that patients’ symptoms often worsen after injuries or falls.
These new findings are key to furthering our understanding of the links between heart disease and dementia.
If you care about heart disease, please read studies about foods that could increase risks of heart disease, and instant death from heart attack common in people who do not exercise.
For more information about heart health, please see recent studies about a new way to treat heart attacks, and results showing new way to repair and prevent damage after heart attack.
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