Nine out of every 10 strokes has a modifiable risk factor, including hypertension, a new study suggests. Stroke is the fifth leading cause of death in the United States, where about 800,000 Americans suffer a stroke each year, according to the Centers for Disease Control and Prevention.
For the research, published Friday in The Lancet, scientists analyzed nearly 27,000 people from every continent in the world and found that 10 factors accounted for 90% of stroke risk in all regions. The relative role of each factor on stroke risk varied by region, and study authors said those observations could inform governments’ approach to the disease.
Researchers’ findings build upon previous conclusions drawn from the INTERSTROKE study, which identified 10 modifiable risk factors for stroke in about 6,000 participants from 22 countries, according to a news release. They studied an additional 20,000 people in 32 countries to identify the main causes of stroke in diverse populations and within subtypes of stroke.
The two major types of stroke are ischaemic stroke, which is caused by blood clots and accounts for 85% of the incidents, and haemorrhagic stroke, or bleeding in the brain, which comprises 15% of strokes.
To estimate each risk factor’s effect on stroke risk, study authors calculated each one’s population attributable risk (PAR), a measurement used to determine how eliminating an individual risk factor could impact an overall disease burden.
Study authors found that the PAR was about 48% for hypertension— making it the biggest risk factor for stroke— about 36% for physical inactivity, about 23% for poor diet, 19% for obesity, 12% for smoking, 9% for heart causes, 4% for diabetes, 6% for alcohol intake, 6% for stress, and 27% for lipids.
Some factors, like obesity and diabetes, are already associated with one another. When combined, the total PAR for all 10 risk factors was about 90%— an estimate that was similar among all regions, age groups, and in men and women.
Source: Fox News