Health
Lower dementia risk linked to routine vaccination in major new analysis
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The shingles vaccine could slow the progress of dementia, according to a new study from Stanford.
These findings follow previous research that found older adults who received the vaccine were 20% less likely to develop dementia over the next seven years compared to those who didn’t get the shot.
“For the first time, we now have evidence that likely shows a cause-and-effect relationship between shingles vaccination and dementia prevention and treatment,” Dr. Pascal Geldsetzer, assistant professor of medicine and senior author of the new study, told Fox News Digital.
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A team of scientists used public health data in Wales, where, for several years, eligibility for the shingles vaccine (Zostavax) was based strictly on birth date.
People born just before the cutoff automatically qualified, while people born just after did not.
A new study suggests the shingles vaccine may help slow dementia progression in people already diagnosed with the disease. (iStock)
This created two large groups of older adults who were nearly identical in age, health profile and background, only differing by who received the vaccine. This allowed researchers to compare dementia rates in a way that avoided some of the biases seen in observational studies.
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After the initial analysis from April, researchers dug deeper into the records and found that the vaccine’s benefits extended from the earliest signs of cognitive decline all the way to the last stages of dementia.
Over the course of nine years, people who received the vaccine were less likely to be diagnosed with mild cognitive impairment.
Researchers found that vaccinated dementia patients had lower dementia-related death rates than unvaccinated patients. (iStock)
Additionally, those who received the vaccine after a dementia diagnosis were significantly less likely to die from dementia in the next nine years, suggesting that the vaccine could slow the progress of the disease.
Nearly half of the Welsh seniors who had dementia at the start of the vaccination program ended up dying from dementia in the follow-up, compared to only 30% of those who received the vaccine.
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“There is a growing body of research showing that viruses that preferentially target your nervous system and hibernate in your nervous system for much of your life may be implicated in the development of dementia,” said Geldsetzer.
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That includes the chickenpox virus, which stays in the body for life. In older age, it can reactivate and cause shingles, and sometimes it can trigger inflammation in or around the brain, according to Mayo Clinic.
Preventing viral flare-ups could also reduce inflammation, which has been linked to dementia risk, experts say.
Scientists say randomized trials are needed to confirm whether a shingles vaccination can genuinely slow dementia. (iStock)
The critical limitation of this research, according to the team, is that the health behaviors of those who get vaccinated are different than those who do not.
“We have very little, if any, information on these behaviors in electronic health records or medical claims data,” Geldsetzer noted.
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For instance, the researchers don’t know about the patients’ dietary behaviors or physical activity levels.
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“If the shingles vaccine really prevents or delays dementia — and, with this new study, also appears to have benefits for those who already have dementia — then this would be a hugely important finding for clinical medicine, population health and research into the causes of dementia,” Geldsetzer emphasized.
Fox News Digital reached out to shingles vaccine manufacturers for comment.
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Health
Dementia risk signals could lie in simple blood pressure readings, researchers say
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Simple measurements taken during routine blood pressure checks could predict dementia risk years before symptoms appear.
That’s according to new research presented this week at the American College of Cardiology’s Annual Scientific Session in Louisiana.
The findings draw on two studies led by researchers at Georgetown University, which suggest that monitoring how blood vessels age and stiffen over time can provide a window into future cognitive health.
LURKING DEMENTIA RISK EXPOSED BY BREAKTHROUGH TEST 25 YEARS BEFORE SYMPTOMS
Data shows rates of dementia and aging-related cognitive decline are expected to increase as populations age, and half of U.S. adults have high blood pressure (hypertension).
Scientists believe that efforts to better address hypertension, a key contributor to heart disease and a risk factor for dementia, could affect both cardiac and brain health.
Data shows rates of dementia and aging-related cognitive decline are expected to increase as populations age. Meanwhile, half of U.S. adults have high blood pressure. (iStock)
“Blood pressure management isn’t just about preventing heart attacks and strokes; it may also be one of the most actionable strategies for preserving cognitive health,” Dr. Newton Nyirenda, the study’s lead author and an epidemiologist at Georgetown University in Washington, said in a press release.
The research focused on two metrics, the pulse pressure-heart rate index and estimated pulse wave velocity. Both were calculated using data collected during standard doctor visits, such as heart rate, age and blood pressure.
“Blood pressure management isn’t just about preventing heart attacks and strokes; it may also be one of the most actionable strategies for preserving cognitive health.”
Researchers examined five years of data patterns for more than 8,500 people in the SPRINT trial, a large study of adults 50 years and older with hypertension. In the follow-up, 323 of the participants developed probable dementia.
HIDDEN BRAIN CONDITION MAY QUADRUPLE DEMENTIA RISK IN OLDER ADULTS, STUDY SUGGESTS
In one study, the team found the pulse pressure-heart rate index was a strong independent predictor of dementia risk in adults over 50. For participants under 65, every one-unit increase was associated with a 76% higher risk of developing dementia.
For participants under 65, an increase in the pulse pressure-heart rate index was associated with a 76% higher risk of developing dementia. (iStock)
The second study found that adults with consistently elevated or rapidly increasing pulse wave velocity were more likely to develop dementia than those with stable velocity, even after accounting for factors like smoking, gender and cardiovascular history.
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“Our findings suggest that vascular aging patterns may provide meaningful insight into future dementia risk,” said Nyirenda. “This reinforces the idea that managing vascular health earlier in life may influence long-term brain health.”
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The team emphasized that clinicians should tailor risk assessments and treatment strategies to the individual.
Further studies are needed to confirm these parameters and determine whether changing vascular aging trajectories reduces dementia risk. (iStock)
“You don’t want to wait until a patient starts manifesting cognitive decline before you act,” said senior study author Sula Mazimba, an associate professor at the University of Virginia.
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Researchers noted the study could not establish causation. Other limitations included the fact that participants already had hypertension and elevated cardiovascular risk, meaning the findings may not apply to people without those conditions.
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Further studies are needed to confirm these findings and to determine whether improving blood vessel health over time could reduce dementia risk.
Health
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