10 factors associated with 90% risk of stroke

[img_inline align=”right” src=”http://padnws01.mcmaster.ca/images/odonnell.jpg” caption=”Martin O’Donnell, one of the researchers who have found 10 risk factors associated with 90 per cent of the risk of stroke. File photo.”]
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McMaster University researchers have found there are 10 risk factors that determine almost
all risks of stroke world-wide.
Authors Martin O'Donnell and Salim Yusuf, professors at the Michael G. DeGroote
School of Medicine, along with colleague investigators of the INTERSTOKE study, found the
following 10 risk factors to be significantly associated with 90 per cent of the risk of
stroke: high blood pressure, smoking, waist-to-hip ratio (abdominal obesity), diet,
physical activity, lipids (fats), diabetes mellitus, alcohol intake, stress and depression, and
heart disorders.
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The study of 6,000 people in 22 countries is being published online today and then in
an upcoming publication of the prestigious journal The Lancet. It will also be discussed by
the authors at the World Congress of Cardiology in Beijing today. The study was
coordinated by the Population Health Research Institute at McMaster University and
Hamilton Health Sciences.
Stroke is the second leading cause of death worldwide, and the leading cause of
acquired disability in adults in most regions. The contribution of various risk factors to the
burden of stroke worldwide is unknown, particularly in countries of low and middle income
where the largest burden of stroke occurs.
Collectively, the risk factors accounted for 90 per cent of the population-attributable
risks for all stroke. These risk factors were all significant for ischaemic stroke (caused by a
blood clot blocking a blood vessel in the brain), whereas high blood pressure, smoking,
waist-to-hip ratio, diet, and alcohol intake were significant risk factors for intracerebral
haemorrhagic stroke (bleeding into the brain tissue). The ratio of bad to good blood lipids
(apolipoproteins) was an important risk factor for ischemic stroke but not for haemorrhagic
stroke.
The authors highlight that nine of ten risk factors (not including cardiac disorders) in
INTERSTROKE are the same as in INTERHEART, a study also led by Yusuf which looked at
risk factors for heart attacks.
The investigators are currently undertaking the second phase of INTERSTROKE, which
aims to include 20,000 participants.
"The findings confirm that stroke prevention programs targeting these common risk
factors will have a significant impact in reducing the incidence of disease," said Antoine
Hakim, CEO and scientific director of the Canadian Stroke Network.
The study was funded by the Canadian Institutes of Health Research, the Heart and
Stroke Foundation of Ontario, the Canadian Stroke Network and five other funding sources,
including unrestricted support from several pharmaceutical companies.
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