1. A documented 33% dementia chance post-stroke from an Australian study? May 2012.
2. Then this study came out and seems to have a range from 17-66%. December 2013.
3. A 20% chance in this research. July 2013.
https://www.yahoo.com/news/suffering-stroke-may-double-risk-dementia-finds-large-100237857.html
In
the largest study of its kind ever conducted, new UK research has found
that people who suffer a stroke could be around twice as likely to
develop dementia.
Led
by researchers at the University of Exeter Medical School, the new
meta-analysis looked at data on stroke and dementia risk gathered from
48 studies with a total of 3.2 million people around the world.
After
taking into account other risk factors for dementia, such as blood
pressure, diabetes and cardiovascular disease, the researchers found
that having a stroke still significantly increased the risk of the
condition, providing the strongest evidence yet that stroke plays a role
in dementia risk.
The
findings also support previous research which has also found an
association between the two conditions, however previous studies did not
establish to what extent a stroke may increase the risk of dementia.
"We
found that a history of stroke increases dementia risk by around 70%,
and recent strokes more than doubled the risk. Given how common both
stroke and dementia are, this strong link is an important finding.
Improvements in stroke prevention and post-stroke care may therefore
play a key role in dementia prevention," said study author Dr. Ilianna
Lourida, of the University of Exeter Medical School.
"Around
a third of dementia cases are thought to be potentially preventable,
though this estimate does not take into account the risk associated with
stroke. Our findings indicate that this figure could be even higher,
and reinforce the importance of protecting the blood supply to the brain
when attempting to reduce the global burden of dementia," added Dr.
David Llewellyn.
The
team noted that as most people who have a stroke do not go on to
develop dementia, further research is now needed to assess whether other
factors could modify the increased risk of dementia, and whether
differences in care and lifestyle following a stroke can reduce the risk
of dementia further.
According to the World Health Organization, 15 million people have a stroke each year and around 50 million people have dementia.
The findings can be found published in Alzheimer's & Dementia: The Journal of the Alzheimer's Association.
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