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Study finds high prevalence of hidden brain changes in people with heart disease

March 27, 2024
in Science
Study finds high prevalence of hidden brain changes in people with heart disease
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A new analysis involving over 13,000 people has found changes to blood vessels in the brain that can increase the risk of stroke and dementia are common in people with a range of heart conditions, regardless of whether they have experienced a stroke.

The new research, published today in Neurology®, the medical journal of the American Academy of Neurology, is the most comprehensive systematic review of ‘hidden’ brain changes in people with a range of heart conditions to date.

Lead author Dr Zien Zhou from The George Institute for Global Health said that identifying these changes could play an important role in choosing treatments for these patients.

“Although people with heart disease are two to three times more likely than the general population to have changes in their brain’s vascular system, they’re often overlooked, because these patients don’t routinely undergo brain imaging unless they have suffered a stroke,” he said.

“But it can make them more susceptible to the risk of brain bleeds from medications commonly used to treat or prevent blood clots — intracranial hemorrhage is a life-threatening complication with no proven treatment and a survival rate of less than 50 percent.”

Changes to blood vessels in the brain that can only be detected by brain imaging such as silent brain infarction (SBI) and cerebral small vessel disease (CSVD) are known to occur more commonly in older people or those who have hypertension. While not sufficient to cause obvious neurological symptoms, they can result in subtle neurological deficits and increase the longer-term risk of stroke or dementia.

To determine the prevalence of these hidden or covert cerebrovascular changes in adults with atrial fibrillation, coronary artery disease, heart failure or cardiomyopathy, heart valve disease, and patent foramen ovale (a hole in the heart), George Institute researchers conducted a meta-analysis of 221 observational studies published between 1988 and 2022.

The findings showed that in people with heart disease:

approximately one third had any form of SBI a quarter had lacune (small cavities where neural tissue has died after a previous blockage or leakage from small arteries) two-thirds had white matter lesions (damage to the protective coating around nerve fibres) a quarter had evidence of asymptomatic microbleeds in the brain tissue, and over one half had brain atrophy (a shrinking of the brain due to loss of neurons or connections between neurons).

The prevalence of these brain changes was generally the same between those with and without a recent stroke and there were no apparent sex differences in the results.

Dr Zhou said the study also confirmed that heart disease is one of the main causes of these changes that reflect brain ‘frailty’.

“While several potential mechanisms of the association between heart disease and hidden cerebrovascular injury have been proposed, the two conditions share common risk factors such as ageing, hypertension, type 2 diabetes, hyperlipidaemia, and smoking,” said Dr Zhou.

“It’s possible that a gradual decline in cardiac output in some patients with heart disease might affect how much blood is reaching the brain tissue, contributing to vascular changes and cognitive dysfunction in these patients,” he added.

“It’s also possible that hidden brain changes and cognitive dysfunction are a consequence of tiny blood clots traveling to the brain through the arterial circulation after forming in the heart.”

Dr Zhou said that more research was needed to look at the exact causes of these brain changes and the implications for managing these patients.

“We need to know whether performing an additional MRI in those considered for anticoagulation therapy — which is required for most people with heart disease — would be cost-effective in terms of preventing unwanted side effects,” he said.

“But refining the risks of brain clots and bleeds from anticoagulants and using this information to make the best treatment choice could improve treatment safety for people with heart disease.”

>>> Read full article>>>
Copyright for syndicated content belongs to the linked Source : Science Daily – https://www.sciencedaily.com/releases/2024/03/240326170112.htm

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