Older adults whose blood pressure was pushed below 130/80 mm Hg were 15 percent less likely to develop dementia than those given usual care, according to a cluster-randomized trial published in Nature Medicine in April 2025.
The four-year study, called CRHCP-3, included 33,995 people aged 40 and older with uncontrolled hypertension across 326 villages in rural China.
Risk of cognitive impairment without dementia dropped 16 percent in the same group.
Because participants were randomly assigned village by village to intensive care or standard care, the finding carries more weight than the observational studies that have long linked high blood pressure to memory loss.
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What the trial actually did
In the intervention villages, non-physician community health workers, known locally as village doctors, titrated antihypertensive drugs to a target of below 130/80 mm Hg.
They also coached patients on home blood pressure monitoring, weight loss, salt intake and alcohol. Participants in usual-care villages continued with their existing doctors and no set target.
After 48 months, systolic pressure was 22.0 mm Hg lower in the intensive group and diastolic pressure was 9.3 mm Hg lower.
The intensive group averaged about three blood pressure medications, compared with one in the standard group, and adherence reached 88 percent versus 66 percent.
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Dementia incidence fell from 5.4 percent in the standard-care villages to 4.6 percent in the intervention villages. Mild cognitive impairment dropped from 21 percent to 17 percent.
Why this study matters
Earlier trials, including SPRINT MIND in the United States, hinted that tighter blood pressure control might protect the brain, but none had shown a statistically significant drop in all-cause dementia.
"Our study is the first to report a statistically significant reduction in the risk of all-cause dementia associated with antihypertensive treatment," said Jiang He, professor of epidemiology at UT Southwestern Medical Center, who led the research.
The finding fits a broader picture. The 2024 Lancet Commission on dementia concluded that nearly half of dementia cases could be prevented by addressing 14 modifiable risk factors, with midlife hypertension high on the list.
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Richard Oakley, associate director of research at Alzheimer's Society, told reporters that the trial reinforces a familiar message. "What's good for your heart is often also good for your head," he said.
What it means in practice
Current U.S. guidelines from the American Heart Association and the American College of Cardiology already define blood pressure at or above 130/80 mm Hg as stage 1 hypertension.
The trial suggests that hitting that target, not just staying under the older 140/90 threshold, may pay off for the brain as well as the heart.
The trial does not tell readers to change medications on their own. Reaching a lower target usually means more drugs, closer monitoring and lifestyle changes such as reducing salt and losing weight.
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Anyone with hypertension who is not currently at target should raise the finding with their own doctor before adjusting treatment.
The intervention also relied heavily on frequent contact with a health worker, something most people can approximate with regular home monitoring.
Welltica has previously covered how home blood pressure monitoring reduced heart attack risk by 34 percent in another trial, and the same routine may help patients and clinicians track progress toward the tighter target used in the Chinese study.
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This article is made and published by Mie Hermansen, who may have used AI in the preparation.