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Hidden Brain Risk: Midlife High Blood Pressure
Hypertension in your 40s, 50s, or 60s could affect late-life thinking skills. Discover what Johns Hopkins researchers know about the connection, plus ways to keep your blood pressure under control and your brain at its best.
It’s long been known that keeping your blood pressure within a healthy range helps protect against heart attack and stroke. Now a recent study from Johns Hopkins University has uncovered a new risk worth sidestepping: People with high blood pressure at midlife had greater decline in key thinking skills later in life than those with normal blood pressure readings.
Although the difference was slight—equivalent to an extra 2.7 years of brain aging, on average, when study volunteers were in their 70s, 80s, and 90s—the results are nevertheless significant, says lead researcher and neurologist Rebecca Gottesman, M.D. Ph.D., director of research at the Johns Hopkins Bayview Medical Center. “This wouldn’t be enough cognitive decline for most people to notice the difference,” she says. “But it could be enough to push someone over the threshold to a diagnosis of mild cognitive impairment or dementia.”
Measuring Cognitive Decline
Gottesman and her team discovered this link by analyzing health information gathered from more than 15,000 adults for the Atherosclerosis Risk in Communities Study, a long-term project started in the late 1980s that has followed volunteers for over 25 years. The scientists compared study participants’ blood pressure measurements (the first taken between ages 48 and 67) with the results of three thinking-skills tests they took several times during the study. The results:
Speed and planning skills were hardest hit. High blood pressure was linked most closely with slowdowns in two key thinking skills:
- Mental processing speed—how fast you can do a math problem (such as figuring out a restaurant tip) or understand complicated instructions (such as tricky driving directions)
- Executive function—how well you can plan, organize, remember details, and manage your time
High blood pressure was associated with above-normal declines. Almost everyone showed some signs of fuzzy thinking and memory loss over the 25 years. But people with midlife hypertension had a 6.5 percent steeper decline by the time they were in their 70s, 80s, and 90s.
Controlling blood pressure helped. People who had high blood pressure at midlife and controlled it with medication had better results on the brain tests than those whose blood pressure was not controlled.
How High Blood Pressure Can Affect Thinking Skills
“High blood pressure leads to brain changes that are similar to the results of a stroke,” Gottesman explains. “Sometimes we call the changes ‘silent strokes’ because they don’t always cause symptoms at the time.”
High blood pressure may also damage tiny arteries that feed “white matter”—the wirelike cells that carry information from one area of the brain to another. “We plan to further explore the ways high blood pressure may damage the brain,” notes Gottesman.
Dementia (di-men-sha): A loss of brain function that can be caused by a variety of disorders affecting the brain. Symptoms include forgetfulness, impaired thinking and judgment, personality changes, agitation and loss of emotional control. Alzheimer’s disease, Huntington’s disease and inadequate blood flow to the brain can all cause dementia. Most types of dementia are irreversible.