Alzheimer’s disease is the most common cause of dementia, a condition that slowly destroys memory, thinking abilities, and the capacity to perform everyday tasks.
As populations age around the world, Alzheimer’s disease is becoming one of the biggest public health challenges. Millions of families are already caring for loved ones with dementia, and experts expect the number of cases to rise sharply in the coming decades.
Scientists have long suspected that heart and blood vessel health may influence the risk of Alzheimer’s disease. The brain relies on a steady supply of oxygen and nutrients carried by blood.
When blood flow is disrupted or blood vessels become damaged, brain cells may also suffer. Previous studies have linked conditions such as high blood pressure, stroke, and heart disease to problems with memory and thinking.
A new study has now provided more evidence that different forms of cardiovascular disease may be connected to Alzheimer’s disease in different ways. The research was published online in the Journal of the American Heart Association.
The study was led by researcher Aili Toyli and colleagues from Michigan Technological University. The team analyzed information from two of the world’s largest health databases.
One was the UK Biobank, which included more than 502,000 participants. The other was the All of Us Research Program in the United States, which included more than 287,000 participants.
The researchers examined the relationships between Alzheimer’s disease and 11 different types of cardiovascular disease. They wanted to determine whether certain heart and blood vessel conditions were more strongly linked to Alzheimer’s disease than others.
The results showed that most of the cardiovascular conditions studied were significantly associated with Alzheimer’s disease in both databases. However, one finding stood out. The strongest and most consistent association involved hypotension, which is the medical term for low blood pressure.
Low blood pressure has received much less attention than high blood pressure in Alzheimer’s research. Doctors often focus on hypertension because it is extremely common and is known to damage blood vessels throughout the body. However, the new findings suggest that low blood pressure may also deserve serious consideration.
The researchers also found strong links between Alzheimer’s disease and hypertension, as well as cerebral infarction, which is a type of stroke caused by blocked blood flow to the brain. Surprisingly, they did not find a significant association between Alzheimer’s disease and acute myocardial infarction, commonly known as a heart attack.
The team also looked at genetics. They discovered that Alzheimer’s disease and cardiovascular diseases share some genetic regions. These shared regions included areas near well-known genes such as APOE and MAPT.
APOE has long been recognized as one of the strongest genetic risk factors for Alzheimer’s disease. The findings suggest that some people may have inherited biological pathways that affect both brain health and cardiovascular health.
Scientists do not yet know exactly why low blood pressure may be linked to Alzheimer’s disease. One possibility is that persistently low blood pressure reduces blood flow to the brain.
Over time, this reduced circulation could limit the supply of oxygen and nutrients that brain cells need to function properly. Another possibility is that low blood pressure may be a sign of underlying changes in the nervous system that are also involved in Alzheimer’s disease.
The researchers emphasize that the study does not prove that low blood pressure directly causes Alzheimer’s disease. Instead, it shows that the two conditions are associated with one another. More research is needed to understand the biological mechanisms behind these links.
The findings are important because they suggest that cardiovascular health and brain health may be more closely connected than previously thought. The study also highlights an area that has received relatively little scientific attention.
If future studies confirm these findings, doctors may eventually use blood pressure patterns and other cardiovascular markers to identify people who could benefit from earlier monitoring or preventive strategies for Alzheimer’s disease.
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Source: Michigan Technological University.
