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In an alarming study presented at the American Stroke Association’s International Stroke Conference 2024, researchers from McMaster University in Ontario, Canada, have uncovered a startling link between strokes and a significantly increased risk of dementia.
The findings shed light on the long-term impact strokes can have on cognitive health, urging a closer look at stroke prevention and comprehensive care for survivors.
The study, led by Dr. Raed Joundi and his team, delved into data from over 15 million people in Ontario, Canada. Their focus was on stroke survivors without dementia for at least 90 days, revealing a crucial connection between strokes and dementia risk (via Medical News Today).
Alarming New Study Reveals 80% Spike in Dementia Risk After Stroke
The Findings
The headline revelation is that individuals who experience a stroke face an astonishing 80% higher risk of developing dementia compared to the general population. This risk is even higher than for those who had a heart attack but not a stroke.
The study also uncovered a nuanced timeline for dementia risk post-stroke. In the first year after a stroke, the risk is nearly three times higher, emphasizing the immediate impact of stroke-induced brain injury. Over time, the risk decreases but remains elevated even two decades later.
Individuals who suffered from intracerebral hemorrhage, a type of stroke involving bleeding in the brain, faced a nearly 150% higher risk of dementia than the general population.
Every year, 15 million people worldwide experience a stroke. Approximately half of these survivors live with permanent disabilities, including memory loss, highlighting the global impact of strokes on cognitive health.
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Expert Opinions
Speaking to Medical News Today, Dr. Cheng-Han Chen, a board-certified interventional cardiologist, emphasizes the need to monitor stroke survivors for cognitive decline and initiate lifestyle modifications to reduce their risk. Dr. José Morales, a vascular neurologist, underscores the importance of preventing strokes to mitigate the heightened risk of dementia.
During a stroke, the brain’s oxygen flow is disrupted, leading to the death of brain cells and potential cognitive impairment. The study underscores the importance of establishing a direct link between strokes and dementia, particularly as the aging population experiences more strokes and survives their consequences.
Looking Ahead
The study‘s findings highlight the critical importance of stroke prevention in reducing the risk of dementia. The increased risk persisted even after stroke survivors were matched with control groups based on age, gender, socioeconomic status, and vascular risk factors.
While the study provides invaluable insights, it acknowledges the use of administrative data, pointing to the need for additional research using cognitive assessments and neuroimaging to better understand why some stroke survivors develop dementia while others do not.
This groundbreaking study advocates for increased awareness, proactive stroke prevention, and improved care for stroke survivors emphasizing the serious impact strokes can have on long-term cognitive health.
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